Patent ID: 6723439
Filing Date: 2004-04-20
Classification: C08K,C09D,Y10T

Abstract:
A curable composition comprising:(A) an organopolysiloxane represented by the formula: wherein W represents a hydroxyl group or a hydrolyzable group; each of R1 and R independently represents an unsubstituted or substituted monovalent hydrocarbon group having 1 to 12 carbon atoms, provided that the hydrocarbon groups R1 as well as the hydrocarbon groups R may be identical with or different from each other; n is an integer of 5 or greater; and a is 0, 1 or 2, (B) a hydrophobic silica, (D) at least one silicone oil selected from a silicone oil represented by the formula (II), a silicone oil having groups represented by the formula (III) and a silicone oil represented by the formula (IV), (R2)3SiO(SiR32O)nSi(R2)3â€ƒâ€ƒFormula (II): wherein the groups R2 may be identical with or different from each other, and each thereof represents a 1 to 10 carbon atoms having alkyl, aryl, aralkyl or fluoroalkyl; the groups R3 may be identical with or different from each other, and each thereof represents a 1 to 10 carbon atoms having alkyl, aryl, aralkyl or fluoroalkyl; and n is a number of 0 to 150, â€ƒâ‰¡SiR4OSiR5bY3âˆ’bâ€ƒâ€ƒFormula (III):wherein R4 represents an unsubstituted or substituted divalent hydrocarbon group or a divalent hydrocarbon group containing an ether bond; R5 represents an unsubstituted or substituted monovalent hydrocarbon group; Y represents a hydrolyzable group; and b is 0, 1 or 2, R6xSi(R7â€”Z)yO(4âˆ’xâˆ’y)/2â€ƒâ€ƒFormula (IV): wherein R6 represents a hydrogen atom or any of an alkyl group, an aryl group and an aralkyl group, these groups each having 1 to 10 carbon atoms; R7 represents an ether group, an ester group or a divalent aliphatic hydrocarbon group having 1 to 10 carbon atoms between which â€”NHâ€” may be present; z represents a monovalent polar group selected from among an amino group, a carboxyl group, an epoxy group and a polyethylene glycol or polypropylene glycol group whose terminal may be blocked with a 1 to 6 carbon atoms having alkyl or acyl; and x and y satisfy the relationship: 0.01&lE;x3.99, 0.02&lE;y<4 and 0.02&lE;x+y<4, wherein said hydrophobic silica (B) is thermally treated at 100Â° C. or higher together with the organopolysiloxane (A).