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A coating composition excellent in dispersion stability of a photocatalyst even in a highly hydrophobic alcohol, excellent in storage stability, giving a coating layer excellent in durability and adhesion, and having a photocatalytic function, which comprises (a) at least one component selected from

A coating composition excellent in dispersion stability of a photocatalyst even in a highly hydrophobic alcohol, excellent in storage stability, giving a coating layer excellent in durability and adhesion, and having a photocatalytic function, which comprises (a) at least one component selected from the group consisting of an organosilane represented by (R 1 ) n Si (OR 2 ) 4-n (wherein, R 1 represents a monovalent organic group; R 2 represents an alkyl group or an acyl group; and n is an integer ranging from 0 to 2), a hydrolyzate and a condensates thereof; (b) an organosiloxane oligomer having an SiO bond and a specific Mw; (c) a photocatalyst; and (d-1) an organic solvent having a surface tension at 20° C. of 260 μN/cm or less.

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1. A coating composition comprising:(a-1) at least one component selected from the group consisting of an organosilane represented by general formula (1) wherein n is 1 or 2, and at least one of R 1 groups is an epoxy group-containing substituted derivative, a hydrolyzate of said organosilane and a

1. A coating composition comprising:(a-1) at least one component selected from the group consisting of an organosilane represented by general formula (1) wherein n is 1 or 2, and at least one of R 1 groups is an epoxy group-containing substituted derivative, a hydrolyzate of said organosilane and a condensate of said organosilane; and(a-2) at least one component selected from the group consisting of an organosilane represented by general formula (1) wherein no epoxy group is contained in R 1 , a hydrolyzate of said organosilane and a condensate of said organosilane;(b) an organosiloxane oligomer having a weight average molecular weight of 300 to 100,000;(c) a photocatalyst; and(d′) an organic solvent having a surface tension at 20° C. of 260 μN/cm or less: 1 ) n Si(OR 2 ) 4-n   (1)wherein, R 1 , which may be the same or different when two or more R 1 groups are present, represents a monovalent organic group having 1 to 10 carbon atoms; R 2 , which may be the same or different when two or more R 2 groups are present, represents an alkyl group having 1 to 5 carbon atoms or an acyl group having 1 to 6 carbon atoms; and n is an integer ranging from 0 to 2. 2. A coating composition comprising:(a) at least one component selected from the group consisting of an organosilane represented by the following general formula (1), a hydrolyzate of said organosilane and a condensates of said organosilane;(b) an organosiloxane oligomer having a weight average molecular weight of 300 to 100,000;(c) a photocatalyst;(d′) an organic solvent having a surface tension at 20° C. of 260 μN/cm or less: 1 ) n Si(OR 2 ) 4-n   (1)wherein, R 1 , which may be the same or different when two or more R 1 groups are present, represents a monovalent organic group having 1 to 10 carbon atoms; R 2 , which may be the same or different when two or more R 2 groups are present, represents an alkyl group having 1 to 5 carbon atoms or an acyl group having 1 to 6 carbon atoms; and n is an integer ranging from 0 to 2; and(e) a polymer containing a silyl group having a silicon atom bound to a hydrolytic group and/or a hydroxyl group. 3. The coating composition according to claim 1, wherein said component (b) has a group represented by general formula —(RO) p—(R′O)q—R″ wherein R and R 1 , which may be the same or different, represent alkyl groups each having 1 to 5 carbon atoms, R″ represents a hydrogen atom or an alkyl group having 1 to 5 carbon atoms, and p+q is from 2 to 30, and a silyl group having a silicon atom bound to a hydrolytic group and/or a hydroxyl group. 4. A method for producing a coating composition which comprises hydrolyzing and/or condensing:(a-1) at least one component selected from the group consisting of an organosilane represented by general formula (1) wherein n is 1 or 2, and at least one of R 1 groups is an epoxy group-containing substituted derivative, a hydrolyzate of said organosilane and a condensate of said organosilane; and(a-2) at least one component selected from the group consisting of an organosilane represented by general formula (1) wherein no epoxy group is contained in R 1 , a hydrolyzate of said organosilane and a condensate of said organosilane; and(b) an organosiloxane oligomer having a weight average molecular weight of 300 to 100,000;in the presence of (c′) an aqueous dispersion of a photocatalyst having a pH of 3 to 9 and (d′) an organic solvent in which the content of an organic solvent having a surface tension at 20° C. of more than 260 μN/cm is 20% by weight or less based on the whole organic solvent: 1 ) n Si(OR 2 ) 4-n   (1)wherein, R 1 , which maybe the same or different when two or more R 1 groups are present, represents a monovalent organic group having 1 to 10 carbon atoms; R 2 , which may be the same or different when two or more R 2 groups are pr esent, represents an alkyl group having 1 to 5 carbon atoms or an acyl group having 1 to 6 carbon atoms; and n is an integer ranging from 0 to 2. 5. A cured product obtained by coating and drying a coating composition comprising:(a-1) at least one component selected from the group consisting of an organosilane represented by general formula (1) wherein n is 1 or 2, and at least one of R 1 groups is an epoxy group-containing substituted derivative, a hydrolyzate of said organosilane and a condensate of said organosilane; and(a-2) at least one component selected from the group consisting of an organosilane represented by general formula (1) wherein no epoxy group is contained in R 1 , a hydrolyzate of said organosilane and a condensate of said organosilane;(b) an organosiloxane oligomer having a weight average molecular weight of 300 to 100,000;(c) a photocatalyst; and(d′) an organic solvent having a surface tension at 20° C. of 260 μN/cm or less: 1 ) n Si(OR 2 ) 4-n   (1)wherein, R 1 , which may be the same or different when two or more R 1 groups are present, represents a monovalent organic group having 1 to 10 carbon atoms; R 2 , which may be the same or different when two or more R 2 groups are present, represents an alkyl group having 1 to 5 carbon atoms or an acyl group having 1 to 6 carbon atoms; and n is an integer ranging from 0 to 2. 6. A cured product having a dry coating layer comprising any one of the following undercoating compositions (i) to (iv), and having thereon a dry coating layer comprising the coating composition according to claim 1:(i) An undercoating composition containing said components (a-1), (a-2), and (e), wherein (e) is a polymer containing a silyl group having a silicon atom bound to a hydrolytic group and/or a hydroxyl group:(ii) An undercoating composition containing said components (a-1), (a-2), (e), and (f), wherein (f) is colloidal silica and/or colloidal alumina;(iii) An undercoating composition containing said components (a-1), (a-2), (e), and (g), wherein (g) is colloidal cerium oxide and/or colloidal zinc oxide; and(iv) An undercoating composition containing said components (a-1), (a-2), (e), (f) and (g). 7. The coating composition according to claim 2, wherein said component (a) is(a-1) at least one component selected from the group consisting of an organosilane represented by general formula (1) wherein n is 1 or 2, and at least one of R 1 groups is an epoxy group-containing substituted derivative, a hydrolyzate of said organosilane and a condensate of said organosilane; and(a-2) at least one component selected from the group consisting of an organosilane represented by general formula (1) wherein no epoxy group is contained in R 1 , a hydrolyzate of said organosilane and a condensate of said organosilane. 8. The coating composition according to claim 2, wherein said component (b) has a group represented by general formula —(RO)p—(R′O)q—R″ wherein R and R′, which may be the same or different, represent alkyl groups each having 1 to 5 carbon atoms, R″ represents a hydrogen atom or an alkyl group having 1 to 5 carbon atoms, and p+q is from 2 to 30, and a silyl group having a silicon atom bound to a hydrolytic group and/or a hydroxyl group. 9. The coating composition according to claim 1, wherein said component (a-1) is γ-glycidoxypropyltrimethoxysilane. 10. The coating composition according to claim 1, wherein said component (b) is a mixture of an oligomer having a weight average molecular weight ranging from 400 to 2,800 and an oligomer having a weight average molecular weight ranging from 3,000 to 50,000. 11. The coating composition according to claim 1, wherein said component (d′) is isopropyl alcohol. 12. The method according to claim 4, wherein said component (a-1) is γ-glycidoxypropyltrimethoxysilane. 13. The method according to claim 4, wherein said component (b) is a mix ture of an oligomer having a weight average molecular weight ranging from 400 to 2,800 and an oligomer having a weight average molecular weight ranging from 3,000 to 50,000. 14. The method according to claim 4, wherein said component (d′) is isopropyl alcohol. 15. A method for producing a coating composition which comprises hydrolyzing and/or condensing:(a) an organosilane represented by the following general formula (1); and(b) an organosiloxane oligomer having a weight average molecular weight of 300 to 100,000;in the presence of (c′) an aqueous dispersion of a photocatalyst having a pH of 3 to 9 and (d′) an organic solvent in which the content of an organic solvent having a surface tension at 20° C. of more than 260 μN/cm is 20% by weight or less based on the whole organic solvent: 1 ) n Si(OR 2 ) 4-n   (1)wherein, R 1 , which maybe the same or different when two or more R 1 groups are present, represents a monovalent organic group having 1 to 10 carbon atoms; R 2 , which may be the same or different when two or more R 2 groups are present, represents an alkyl group having 1 to 5 carbon atoms or an acyl group having 1 to 6 carbon atoms; and n is an integer ranging from 0 to 2;and subsequently adding(e) a polymer containing a silyl group having a silicon atom bound to a hydrolytic group and/or a hydroxyl group. 16. The method according to claim 15, wherein said component (a) is(a-1) at least one component selected from the group consisting of an organosilane represented by general formula (1) wherein n is 1 or 2, and at least one of R 1 groups is an epoxy group-containing substituted derivative, a hydrolyzate of said organosilane and a condensate of said organosilane; and(a-2) at least one component selected from the group consisting of an organosilane represented by general formula (1) wherein no epoxy group is contained in R 1 , a hydrolyzate of said organosilane and a condensate of said organosilane. 17. The method according to claim 15, wherein said component (a) is selected from the group consisting of methyltrimethoxysilane, dimethyldimethoxysilane, and γ-glycidoxypropyltrimethoxysilane. 18. The method according to claim 15, wherein said component (b) is a mixture of an oligomer having a weight average molecular weight ranging from 400 to 2,800 and an oligomer having a weight average molecular weight ranging from 3,000 to 50,000. 19. The method according to claim 15, wherein said component (d′) is isopropyl alcohol. 20. A cured product having a dry coating layer comprising any one of the following undercoating compositions (i) to (iv), and having thereon a dry coating layer comprising the coating composition according to claim 2:(i) An undercoating composition containing said components (a) and (e), wherein (e) is a polymer containing a silyl group having a silicon atom bound to a hydrolytic group and/or a hydroxyl group:(ii) An undercoating composition containing said components (a), (e), and (f), wherein (f) is colloidal silica and/or colloidal alumina;(iii) An undercoating composition containing said components (a), (e), and (g), wherein (g) is colloidal cerium oxide and/or colloidal zinc oxide; and(iv) An undercoating composition containing said components (a), (e), (f) and (g). 21. The coating composition according to claim 2, wherein said component (b) is a mixture of an oligomer having a weight average molecular weight ranging from 400 to 2,800 and an oligomer having a weight average molecular weight ranging from 3,000 to 50,000. 22. The coating composition according to claim 2, wherein said component (d′) is isopropyl alcohol. 23. A cured product obtained by coating and drying a coating composition comprising:(a) at least one component selected from the group consisting of an organosilane represented by the following general formula (1), a hydrolyzate of said organosilane and a condensates of said organosilane;(b) an organosiloxane olig omer having a weight average molecular weight of 300 to 100,000;(c) a photocatalyst; and(d′) an organic solvent having a surface tension at 20° C. of 260 μN/cm or less: 1 ) n Si(OR 2 ) 4-n   (1)wherein, R 1 , which may be the same or different when two or more R 1 groups are present, represents a monovalent organic group having 1 to 10 carbon atoms; R 2 , which may be the same or different when two or more R 2 groups are present, represents an alkyl group having 1 to 5 carbon atoms or an acyl group having 1 to 6 carbon atoms; and n is an integer ranging from 0 to 2; and(e) a polymer containing a silyl group having a silicon atom bound to a hydrolytic group and/or a hydroxyl group. 24. A cured product having a dry coating layer comprising any one of the following undercoating compositions (i) to (iv), and having thereon a dry coating layer comprising the coating composition according to claim 7:(i) An undercoating composition containing said components (a), and (e), wherein (e) is a polymer containing a silyl group having a silicon atom bound to a hydrolytic group and/or a hydroxyl group:(ii) An undercoating composition containing said components (a), (e), and (f), wherein (f) is colloidal silica and/or colloidal alumina;(iii) An undercoating composition containing said components (a), (e), and (g), wherein (g) is colloidal cerium oxide and/or colloidal zinc oxide; and(iv) An undercoating composition containing said components (a), (e), (f) and (g).