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`PATENT ABSTRACTS OF JAPAN
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`(43)Date of publication-of application : 02.08.2000
`
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`(1 1)Pub|ication number :
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`2000-212510
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`(51 )lnt.CI.
`
`c090183/04
`0050
`5/00
`3050 7/24
`B323 27/00
`0090
`5/00
`(2090 7/12
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`(21)Application number : 11-014473
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`(71)Applicant : MATSUSHITA ELECTRIC WORKS
`LTD
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`(22)Date of filing :
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`(72)Inventor : TAKAHAMA KOICHI
`YAMAKI TAKEYUKI
`INOUE MINORU
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`l.................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................g
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`22.01.1999
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`(54) FUNCTIONAL INORGANIC COATING MATERIAL, ITS COATING AND FUNCTIONAL
`COATED PRODUCT
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`(57)Abstract:
`PROBLEM TO BE SOLVED: To obtain the subject inorganic coating material capable of forming
`a coating film excellent in antifouling and anti-fogging properties, surface hardness and abrasion
`resistance and useful for preparing a functional coated product, etc., by including a specific
`silicone resin and a specified photosemiconductor as essential components.
`SOLUTION: This inorganic coating material contains (A) a silicone resin consisting only of a
`tetrafuctional silicone resin containing a (partial) hydrolyzate of a tetrafunctional hydrolyzable
`organosilane represented by the formula SiX4 (Xs are each a hydrolyzable group) such as
`tetramethoxysilane or tetraethoxysilane and (B) a photosemiconductor comprising a nitric acid-
`peptizable type and sol-like photosemiconductor having 7-20 mm average primary particle
`diameter such as titanium oxide and regulated so as to provide 30-70 wt.% compounded amount
`thereof based on the total solid content in a coated and cured film after forming the film as
`essential components. Furthermore, the surface of a substrate such as a metal, a glass or an
`enamel is preferably coated with the functional inorganic coating material, which is preferably
`then baked and cured at 2120° 0 temperature to carry out the coating.
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`LEGAL STATUS
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`[Date of request for examination]
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`[Date of sending the examiner's decision of
`rejection]
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`[Kind of final disposal of application other than
`the examiner's decision of rejection or
`application converted registration]
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`[Date of final disposal for application]
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`[Patent number]
`
`[Date of registration]
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`[Number of appeal against examiner’s decision
`of rejection]
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`JP 2000-212510A
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`[Claim(s)]
`[Claim 1] Said silicone resin consists only of 4 organic-functions silicone resin containing
`hydrolyzate (portion) of 4 organic-functions hydrolysis nature organosilane expressed with the
`following general formula (1) including silicone resin and an optical semiconductor as an
`indispensable component, and it is a general formula SiX4. -- (1)
`(X shows a hydrolysis nature machine the same or of a different kind here)
`A functional inorganic coating currently adjusted so that said optical semiconductor may consist
`of a sol-like light semiconductor with a particle diameter [ first / an average of ] of 7-20nm by
`the nitric-acid amalgam-decomposition type and the loadings may become 30 - 70% of the
`weight to total solids among a spreading hardening coat after film production.
`[Claim 2] Said silicone resin consists only of 4 organic-functions silicone resin containing
`hydrolyzate (portion) of 4 organic-functions hydrolysis nature organosilane expressed with the
`following general formula (1) including silicone resin and an optical semiconductor as an
`indispensable component, and it is a general formula SiX4. -- (1)
`(X shows a hydrolysis nature machine the same or of a different kind here)
`Said optical semiconductor by the nitric-acid amalgam-decomposition type A lst sol-like light
`semiconductor with a particle diameter [ first / an average of ] of 7—20nm, It consists of a 2nd
`sol-like light semiconductor with a particle diameter [ first / an average of ] of 5-6nm by the
`nitric-acid amalgam-decomposition type. A functional inorganic coating currently adjusted so
`that loadings of a these 1st and 2nd sols-like light semiconductor may become 20 - 65 % of the
`weight, and 5 - 10% of the weight to total solids among a spreading hardening coat after film
`production, respectively.
`inorganic coating according to claim 1 or 2 said whose 4
`[Claim 3] A functional
`organic-functions hydrolysis nature organosilanes
`are
`a tetramethoxy silane and/or a
`
`tetra-ethoxy silane.
`
`[Claim 4] A functional inorganic coating given in either to claims 1-3 said whose optical
`
`semiconductor is titanium oxide.
`[Claim 5] The method of application which can be burned on a front face of a base material at
`temperature of 120 degrees C or more, and it is made to harden after applying a functional
`inorganic coating of a publication to either to claims 1-4.
`[Claim 6] A functional paint article which equipped a front face of a base material with a paint
`layer which becomes either to claims 1-4 from a spreading hardening coat of a functional
`inorganic coating of a publication.
`[Claim 7] A functional paint article according to claim 6 whose thickness of said paint layer is
`
`0.01-1 micrometer.
`
`[Claim 8] Said base material A metal, glass, a hoe low, ceramics, cement, concrete, A tree,
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`timber, plastics, inorganic fiber reinforced plastics, each independent material of a paint base
`material which has an inorganic substance coat of at least one layer, and/or an organic substance
`coat of at least one layer on a front face of either of these base materials, A functional paint
`article according to claim 6 or 7 chosen from a group which consists of composite material
`which comes to combine at least two of these, and a charge of laminated wood which comes to
`carry out the laminating of at least two of these.
`[Claim 9] Said coat which said paint base material has on a front face is a functional paint
`article according to claim 8 which is a primer layer.
`[Detailed Description of the Invention]
`
`[0001]
`[The technical field to which invention belongs] This invention relates to the functional
`inorganic coating which can form the paint film excellent in many functions of the difficulty of
`getting damaged of antifouling property, fog resistance, surface hardness, abrasion resistance,
`and a front face etc., especially weatherability, and the method of application and a functional
`
`paint article.
`
`[0002]
`[Description of the Prior Art] The functional inorganic coating which included optical
`semiconductors, such as titanium oxide, in the inorganic coating which uses silicone resin as a
`principal component as a coating which can form the paint film excellent in functions, such as
`antifouling property, is known (reference, such as JP,61-83106,A, JP,08-067835,A,
`JP,10-225658,A, JP,10-237350,A, and W0 96/No. 29375 official report). If ultraviolet rays hit
`the paint film containing an optical semiconductor, many functions, such as the carbon system
`dirt component decomposition effect, the deodorization effect, an antibacterial effect, the
`mildewproofing effect, and the improvement effect in surface hydrophilicity (fog resistance,
`storm sewage washing antifouling property), will be demonstrated according to a photocatalyst
`operation of an optical semiconductor.
`[0003] On the other hand, although there is a thing of one to 4 organic functions in silicone resin,
`if the silicone resin of three or less organic functions is used, the surface hardness of a paint film
`and abrasion resistance which are obtained will fall. Therefore, a blemish tends to be attached
`when a front face is polished. If a blemish is attached surface [ a part of ] when a glass base
`material is especially used as a base material, the value as goods will be halved. Then, for the
`purpose of the surface hardness of a paint film, and wear-resistant improvement, in the
`above-mentioned conventional functional inorganic coating which comes to contain an optical
`semiconductor in the inorganic coating which uses silicone resin as a principal component, this
`applicant for a patent develops the thing using only the silicone resin of four organic functions
`as silicone resin, and has already done patent application previously (Japanese Patent
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`JP 2000-212510A
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`o. No. 323622 [ten to D. Since only the silicone resin of four organic functions is
`Application N
`surface hydrophilicity is given to a paint film by operation
`used for this coating as silicone resin,
`ardness of a paint film and abrasion
`-functions silicone resin itself, and the surface h
`of 4 organic
`philicity grant effect with an optical
`resistance not only improve, but it has the surface hydro
`semiconductor, and the effect that fog resistance, storm sewage washing antifouling property,
`nce a thing with a particle diameter [ first / an
`etc. improve further conjointly. Moreover, si
`even if it is
`average of] of 10-30nm is used as an optical semiconductor used for this coating,
`put on the bottom of a severe friction condition, the paint film which demonstrates sufficient
`abrasion resistance, and gets damaged and lack of an optical semiconductor cannot generate
`easily can be formed.
`
`[0004]
`
`[Problem(s) to be Solved by the Invention] However, it turned out that the spreading hardening
`garlic coating which comes to contain
`coat of the above-mentioned conventional functional inor
`invention persons' after that in the inorganic
`an optical semiconductor by examination of this
`a1 component may be expected
`-functions silicone resin as a princip
`coating which uses 4 organic
`l by the environment where this film is placed, the operating
`the'weatherability of higher leve
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`environment, etc.
`
`ical problem of this invention is to raise the weatherability of the paint
`[0005] Then, the techn
`ain an optical
`film formed
`from the functional inorganic coating which comes to cont
`c-functions silicone resin as a
`semiconductor into the inorganic coating which uses 4 organi
`
`principal component.
`
`ne resin consists only of 4 organic-functions
`of 4 organic-functions hydrolysis nature
`) including silicone resin and an
`
`[0006]
`[Means for Solving the Problem] Said silico
`silicone resin containing hydrolyzate (portion)
`organosilane expressed with th
`e following general formula (1
`optical semiconductor as an indispensable component, an
`concerning this invention is a general formula SiX4. -- (1)
`(X shows a hydrolysis nature machine the same or of a different kind h
`Said optical semiconductor by the nitric-acid amalgam-decomposition type Asol-like light
`semiconductor with a particle diameter [ first / an average of] of 7-20nm It consists of (calling
`this a "lst sol-like light semiconductor" hereafter). The loadings To total solids among a
`spreading hardening coat after film production [whether it is adjusted so that it may become 30
`- 70% of the weight, and ] Or said optical semiconductor turns into said lst sol-like light
`-like light semiconductor with a particle diameter [ first / an
`semiconductor from a 2nd sol
`acid amalgam-decomposition type. Among a spreading
`average of ] of 5—6nm by the nitric-
`loadings of 3 these 1st and 2nd sols-like
`hardening coat after film production, to total solids,
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`ere)
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`JP 2000-212510A
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`light semiconductor are adjusted, respectively so that it may become 20 - 65 % of the weight,
`and 5 - 10% of the weight.
`[0007] In addition, "hydrolysis (portion)" means "partial hydrolysis and/or hydrolysis" among
`this description. The method of application concerning this invention is a method which can be
`burned at temperature of 120 degrees C or more, and is stiffened, after applying a functional
`inorganic coating concerning above-mentioned this invention. A functional paint article
`concerning this invention is equipped with a paint layer which consists of a spreading hardening
`coat of a functional inorganic coating concerning above-mentioned this invention on the surface
`of a base material.
`
`[0008]
`[Embodiment of the Invention] The silicone resin which is one of the indispensable components
`of the functional inorganic coating of this invention is a component which brings fog resistance,
`the antifouling property by storm sewage washing, etc. to this paint film by giving surface
`hydrophilicity (water wettability) to the paint film of a functional inorganic coating while it
`consists only of 4 organic-functions silicone resin containing the hydrolyzate (portion) of 4
`organic-functions hydrolysis nature organosilane and is used as binder resin and a film
`formation component. In addition, the surface hydrophilicity given by the above-mentioned 4
`organic-functions silicone resin does not need a photocatalyst operation of an optical
`semiconductor. Therefore, since it is demonstrated from the time of film production even if it
`does not carry out UV irradiation, even if it paints to the part to which ultraviolet rays cannot hit
`easily or uses the paint article equipped with this paint film in the location where ultraviolet rays
`cannot hit easily, the engine performance which was excellent the account of a top can be
`obtained from the time of film production. Moreover, the above-mentioned paint film is
`excellent in the difficulty of getting damaged of surface hardness, abrasion resistance, and a
`front face etc. with the activity of 4 organic-functions silicone resin.
`[0009] As mentioned above, only 4 organic-functions silicone resin is used as silicone resin. If
`thething of three or less organic functions is added as silicone resin, the paint film engine
`performance of the difficulty of getting damaged of the part, the above-mentioned surface
`hydrophilicity, storm sewage washing antifouling property, fog resistance, surface hardness,
`abrasion resistance, and a front face etc. will fall. If 4 organic-functions silicone resin contains
`the hydrolyzate (portion) of 4 organic-functions hydrolysis nature organosilane, especially
`definition will not be carried out, for example, a solution-like thing or a dispersion-liquid-like
`thing will also be available for the gestalt.
`[0010] What 4 organic-functions hydrolysis nature organosilane used as a raw material of 4
`organic-functions silicone resin is expressed with said general formula (1) to is used. Although
`especially definition will not be carried out if it is a hydrolysis nature machine the same or of a
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`JP 2000-212510A
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`different kind as X in a general formula (1), an alkoxy group, an acetoxy radical, an oxime
`radical, an ENOKISl-II radical, the amino group, aminoxy, an amide group, etc. are mentioned,
`for example. Also in these, since it is easy to prepare the ease and coating of acquisition, an
`alkoxy group is desirable. Moreover, in case that whose R is the alkyl group of carbon numbers
`1-8 applies and stiffens the coating containing the ease of acquisition, the ease of preparing of a
`coating, and 4 organic-functions silicone resin obtained also in an alkoxy group (OR radical; R
`alkyl group), it is desirable especially from points -- a condensation reaction tends to occur,
`0 become a hard paint film. As an example of the alkyl group of the
`consequently it is easy t
`an ethyl group, a propyl group, butyl, a
`above-mentioned carbon numbers 1-8, a methyl group,
`ned. Among the
`a heptyl radical, an octyl radical, etc. are mentio
`pentyl radical, a hexyl group,
`about a with a carbon numbers of three or more
`alkyl groups contained in an alkoxy group,
`n—propyl group and n-butyl, and may have
`thing, you may be a straight chain-like thing like
`branching like an isopropyl group, an isobutyl radical, and t-butyl.
`-functions hydrolysis nature organosilane, although
`[0011] As an example of said 4 organic
`especially definition is not carried out, the alkoxysilane of four functionality, acetoxysilane,
`oxime silanes, hackberry gardenia fruit runs, amino silanes, friend NOKISHI silanes, and amide
`silanes are mentioned, for example. Also in these, from it being easy to prepare the ease and
`ion Alkoxysilane is desirable. Also in these alkoxysilane The coating
`coating of acquisit
`coating, and 4 organic-functions
`containin
`g the ease of acquisition, the ease of preparing of a
`icone resin obtained is applied. In case it is made to harden, especially the alkoxysilane whose
`sil
`quently it is easy to become a hard
`R in [points -- a condensation reaction tends to occur, conse
`paint film -- to ] an alkoxy group (OR radical; R alkyl group) is the alkyl group of the
`above-mentioned carbon numbers 1-8 is desirable.
`[0012] As an example of 4 functionality alkoxysilane, although especially definition is not
`carried out, tetra-alkoxysilane, such as a tetramethoxy silane, a tetra-ethoxy silane,
`a-isopropoxysilane, and tetra--t-butoxysilane, is mentioned, for
`tetra-n-propoxysilane, tetr
`hese, a tetramethoxy silane and a tetra-ethoxy silane are desirable.
`the organosilane compound generally called a silane coupling agent is also
`[0013] Furthermore,
`c-functions hydrolysis nature
`contained in alkoxysilane. Only one sort may be used for 4 organi
`rganic-functions silicone resin can
`and it may use two or more sorts together. 4 o
`organosilane,
`initial-complement addition of the catalyst
`be prepared by making it hydrolyze by carrying out
`etc. for example, at 4 organic-functions hydrolysis nature organosilane if needed [water and if
`needed ] as a curing agent (portion), and making it prepolymer-ize.
`[0014] although especially definition is not carried out, if the mol equivalent ratio (HZ O/X) of
`water (H2 0) to the hydrolysis nature machine (X) which 4 organic-functions hydrolysis nature
`organosilane has shows the amount of the water used in case 4 organic-functions hydrolysis
`
`example. Also in t
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`JP 2000-212510 A
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`nature organosilane is hydrolyzed (portion), for example -- desirable -- 0.3-5.0 -- more --
`desirable -- 0.35-4.0 -- it is 0.4-3.0 still more preferably. If the above-mentioned ratio is less
`than 0.3, hydrolysis will not fully advance, but when there is an inclination for a hardening paint
`film to become weak and 5.0 is exceeded, there is an inclination which silicone resin gels for a
`short time.
`[0015] Although especially definition is not carried out as a catalyst used if needed in case 4
`organic-functions hydrolysis nature organosilane is hydrolyzed (portion), a point to the acid
`catalyst which shortens the time amount concerning the manufacturing process of a functional
`inorganic coating is desirable. as an acid catalyst, although especially definition is not carried
`out, acid sol-like fillers, such as inorganic-acid; acidity colloidal silica, such as organic-acid;
`hydrochloric acids, such as an acetic acid, a chloroacetic acid, a citric acid, a benzoic acid, a
`dimethyl malonic acid, formic acid, a propionic acid, a glutaric acid, a glycolic acid, a maleic
`acid, a malonic acid, toluenesulfonic acid, and oxalic acid, a nitric acid, and a halogenation
`silane, and a titanium oxide sol, etc. mention it, for example -- having -- these -- one sort -- or
`two or more sorts can be used.
`[0016] If needed, hydrolysis (portion) of 4 organic-functions hydrolysis nature organosilane
`may be warmed (it heats at 40-100 degrees C), and may be performed. Hydrolysis (portion) of 4
`organic-functions hydrolysis nature organosilane may be performed if needed by diluting 4
`organic-functions hydrolysis nature organosilane with a suitable solvent. Although especially
`definition is not carried out, as such a diluent solvent (reaction solvent) for example Low-grade
`fatty alcohol, such as a methanol, ethanol, isopropanol, n-butanol, and isobutanol; Ethylene
`glycol, Ethylene glycol derivatives, such as ethylene glycol monobutyl ether and acetic-acid
`ethylene glycol monoethyl ether; A diethylene glycol, Diethylene-glycol derivative [, such as
`the diethylene-glycol monobutyl ether ];, diacetone alcohol, etc. can be mentioned, and one sort
`or two sorts or more of things chosen from the group which consists of these can be used. It can
`use together with these hydrophilic organic solvents, and one sort, such as toluene, a xylene, a
`hexane, a heptane, ethyl acetate, butyl acetate, a methyl ethyl ketone, methyl isobutyl ketone,
`and methylethyl ketoxime, or two sorts or more can be used.
`[0017] the weight average molecular weight (MW) of 4 organic-functions silicone resin used by
`this invention -- polystyrene conversion -- it is -— desirable -- 400-100,000 -- more -- desirable --
`SOD-30,000 -- it is 700-10,000 still more preferably. When the paint film which has sufficient
`surface hardness will not be obtained if weight average molecular weight is less than 400, or the
`hardening contraction in the case of the condensation polymerization of 4 organic-functions
`silicone resin is large, the inclination a crack becomes easy to generate is in a paint film after
`hardening and 100,000 is exceeded, there is an inclination for distribution of an optical
`semiconductor to become difficult.
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`[0018] As for pH of 4 organic-functions silicone resin, it is desirable to be adjusted within the
`limits of 0.5-6. If pH is this within the limits, within the limits of the aforementioned molecular
`weight, it is stabilized and 4 organic-functions silicone resin can be used. This period that can be
`used from the time of functional inorganic coating preparation since the stability of 4
`organic-functions silicone resin is bad as it is out of range will be restricted for pH. What is
`necessary is here, just to adjust especially the pH adjustment method, for example after
`composition of 4 organic-functions silicone resin, using acid reagents, such as a hydrochloric
`acid, that what is necessary is just to adjust to pH of said within the limits using basic reagents,
`such as ammonia, also when pH exceeds 6 when pH becomes less than 0.5 although not limited.
`Moreover, depending on pH, while molecular weight has been small, a reaction does not
`progress to reverse, but when making it arrive at said molecular weight range takes time amount,
`after heating 4 organic-functions silicone resin, promoting a reaction, lowering pH with an acid
`reagent and advancing a reaction, you may return to pH predetermined with a basic reagent.
`[0019] In order that the functional inorganic coating of this invention may make surface
`hydrophilicity of the paint film formed still higher by the photocatalyst effect or may maintain it
`for a long period of time while it obtains the various functions by the photocatalyst effect
`described later, it contains an optical semiconductor. As a gestalt of an optical semiconductor, it
`is easy to distribute into a coating, and hardening progresses more for a short time, and the thing
`of the shape of a nitric-acid amalgam-decomposition type sol is used from points, such as
`excelling in convenience, when using it.
`[0020] In order for the first [ an average of] particle diameter to use only the lst sol-like light
`semiconductor of the following specification range as the above-mentioned sol-like light
`semiconductor in order to raise the weatherability of a paint film, or to raise the weatherability
`of a paint film further, a 2nd sol-like light semiconductor with the first [ an average of] particle
`diameter smaller than this lst sol-like light semiconductor is used together with a 1st sol-like
`light semiconductor. 7-15nm of first [ an average of] particle diameter of a lst sol-like light
`semiconductor is 7-20nm usually 7-12nm more preferably. if there is an inclination of the paint
`film engine performance (for example, *** *-proof) falling if the first [ an average of ] particle
`diameter of a lst sol-like light semiconductor is less than 7nm and it exceeds 20nm -- a paint
`film -- description gets worse -- etc. (for example, the irregularity on the front face of a paint
`film becomes large) etc. -- there is an inclination.
`[0021] The first [ an average of] particle diameter of a 2nd sol-like light semiconductor is
`usually 5-6nm. if the first [ an average of] particle diameter of a 2nd sol-like light
`semiconductor is less than Snm -- this optical semiconductor -- on the contrary -- the 2nd order
`-- condensing -- a paint film -— description gets worse -- etc. (for example, the irregularity on the
`front face of a paint film becomes large) etc. -- there is an inclination, and if it is 7nm or more, it
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`will become a lst sol-like light semiconductor. When carrying out the independent activity of
`the lst sol-like light semiconductor as an optical semiconductor, the loadings of the lst sol-like
`light semiconductor in a functional inorganic coating are usually adjusted 30 to 70% of the
`weight to total solids among the spreading hardening coat after film production so that it may
`become 40 - 60% of the weight preferably. When there are inclinations, like photocatalyst
`activity will become low if it is less than 30 % of the weight and it exceeds 70 % of the weight,
`there is an inclination of the paint film engine performance falling.
`[0022] When using together a lst sol-like light semiconductor and a 2nd sol-like light
`semiconductor as an optical semiconductor, the loadings of the lst sol-like light semiconductor
`in a functional inorganic coating are usually adjusted 20 to 65% of the weight to total solids
`among the spreading hardening coat after film production so that it may become 30 - 60% of the
`weight preferably. When there are inclinations, like photocatalyst activity will become low if it
`is less than 20 % of the weight and it exceeds 65 % of the weight, there is an inclination of the
`
`paint fihn engine performance falling.
`[0023] When using together a lst sol-like light semiconductor and a 2nd sol-like light
`semiconductor as an optical semiconductor, the loadings of the 2nd sol-like light semiconductor
`in a functional inorganic coating are usually adjusted five to 10% of the weight to total solids
`among the spreading hardening coat after film production so that it may become 7 - 10% of the
`weight preferably. When there are inclinations, like photocatalyst activity will become low if it
`is less than S % of the weight and it exceeds 10 % of the weight, there is an inclination of the
`
`paint film engine performance falling.
`[0024] As matter which constitutes an optical semiconductor, although especially definition is
`not carried out, its strontium titanate besides metallic oxides, such as titanium oxide, a zinc
`oxide, tin oxide, an iron oxide, zirconium oxide, tungstic oxide, chrome oxide, molybdenum
`oxide, ruthenium oxide, a germanium dioxide, lead oxide, cadmium oxide, copper oxide, a
`vanadium oxide, niobium oxide, tantalum oxide, manganese oxide, cobalt oxide, an oxidation
`rhodium, nickel oxide, and rhenium oxide, etc. is desirable at the point that the effect which
`promotes hardening (hardening at low temperature including especially ordinary temperature)
`of a paint film be also acquired, for example. Also in these, the above-mentioned metallic oxide
`is easily desirable practical at an available point, and titanium oxide is desirable also especially
`in a metallic oxide in respect of the light catalytic ability, the hardening acceleration engine
`performance, safety, the ease of acquisition, and cost. In addition, when using titanium oxide as
`an optical semiconductor, while that whose crystal mold is an anatase (anatase mold) is used,
`and light catalytic ability and the hardening acceleration engine performance are [ direction] the
`strongest and it is moreover discovered for a long period of time, light catalytic ability and the
`hardening acceleration engine performance are desirable at the point discovered more for a short
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`time.
`[0025] In each of a 1st and 2nd sols-like light semiconductor, one sort of matter which
`constitutes an optical semiconductor may be used, and may be used combining two or more
`sorts. Moreover, it may be the same between lst and 2nd sols-like light semiconductors, and
`you may differ. In addition, it is usable if the thing used as the raw material of an optical
`semiconductor is also the object in which the property of an optical semiconductor is shown
`
`eventually.
`[0026] The optical semiconductor of generating active oxygen (light catalytic) is well-known if
`the light (ultraviolet rays) of excitation wavelength (for example, 400nm or less) is irradiated.
`Since active oxygen can oxidize and can make the organic substance disassemble, the property
`is used. the carbon system dirt component (for example, the carbon fraction contained in the
`exhaust gas of an automobile --) adhering to a paint article The self-cleaning effect which
`disassembles the tar of tobacco etc.; the antibacterial effect; mildewproofing effect which
`prevents generating of the bacillus component represented by the deodorization effect;
`Escherichia coli which decomposes the offensive odor component represented by an amine
`compound and the aldehyde compound, and Staphylococcus aureus can be acquired. Moreover,
`by carrying out decomposition clearance of the dirt with which the optical semiconductor
`formed water into the hydroxylation radical in that photocatalyst operation, and this
`hydroxylation radical adhered to the paint film front face, such as the organic substance which
`crawls water, if ultraviolet rays hit the paint film containing an optical semiconductor The
`hydrophilicity (wettability) of the paint film to water improves further, and the fog resistance in
`which neither glass nor a mirror can bloom cloudy with waterdrop easily, the antifouling
`property by storm sewage washing, etc. are effective in being obtained on higher level or being
`maintained for a long period of time.
`[0027] Furthermore, there is also an antistatic function by photocatalyst operation of an optical
`semiconductor, and the antifouling effect improves further also by this function. For example, if
`ultraviolet rays are irradiated at the paint film containing an optical semiconductor, the antistatic
`effect will be discovered because the surface-electrical-resistance value of a paint film falls
`according to an operation of the optical semiconductor contained in this paint film, and a paint
`film front face will dirt-come to be hard further. Although it is not clearly checked yet by what
`kind of mechanism the surface-electrical-resistance value of a paint film falls when ultraviolet
`rays are irradiated by the optical semiconductor content paint film, it is thought that the
`surface-electrical-resistance value of a paint film falls in the electron generated by UV
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`irradiation and a hole acting.
`[0028] If the metal is supported by the front face of an optical semiconductor, the photocatalyst
`effect of an optical semiconductor will become higher. Although the mechanism is not checked
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`JP 2000-212510 A
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`clearly yet, when a metal is supported by the front face of an optical semiconductor, the charge
`separation of an optical semiconductor is promoted and it is considered that it is related that the
`disappearance establishment of an electron and a hole generated by charge separation becomes
`small.
`[0029] As a metal which may be supported on the front face of an optical semiconductor, silver,
`copper, iron, nickel, zinc, platinum, gold, palladium, cadmium, cobalt, a rhodium, a ruthenium,
`etc. are desirable at the point of promoting the charge separation of an optical semiconductor
`more, for example. Two or more sorts are sufficient as one sort of metals supported. Although
`especially definition is not carried out, as for the metaled amount of support, it is desirable that
`it is 0.1 - 10 % of the weight to an optical semiconductor for example, and it is more desirable
`that it is 0.2 - 5 % of the weight. When the amount of support is less than 0.1 % of the weight,
`even if there is an inclination for the support effect not to fully be acquired and it supports
`exceeding 10 % of the weight, an effect seldom increases but the inclination for problems, such
`as discoloration and performance degradation, to occur in reverse has it.
`[0030] Especially as the metaled support method, although not necessarily limited, the dipping
`method, an impregnation method, a photoreduction method, etc. are mentioned. An optical
`semiconductor may be used in the form inserted between the layers of a clay bridge formation
`object. It is because an optical semiconductor distributes in the shape of a particle between
`layers and light catalytic ability improves. The functional inorganic coating of this invention
`makes still higher the degree of hardness of the spreading hardening coat, are the various
`objects of improving smooth nature and crack-proof