Patent ID: 7759406

Claim:
A process for producing a polysilsesquioxane graft polymer including a repeating unit shown by the following formula (1) in the molecule, wherein A represents a linking group, R 1 represents a hydrocarbon group which may have a substituent, R 2 represents a hydrogen atom or an alkyl group having 1 to 18 carbon atoms, R 3 represents a polar group or an aryl group which may have a substituent, R 4 represents a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, an ester group, or an acyl group, k 1 , k 2 , and k 3 individually represent arbitrary positive integers, provided that, when k 1 , k 2 , and k 3 respectively represent two or more, the groups shown by the formula: —CH 2 —C(R 2 )(R 3 )— may be the same or different, and l, m, and n individually represent zero or an arbitrary positive integer, provided that the case where “m=n=0” is excluded, the process comprising applying ionizing radiation or heat to a mixture including a polysilsesquioxane compound including a repeating unit shown by the following formula (2), wherein A, R 1 , R 4 , l, m, and n have the same meanings as defined above, and Q represents an iniferter group, and a vinyl compound shown by the following formula (3): CH 2 ═C(R 2 )—R 3 (wherein R 2 and R 3 have the same meanings as defined above).