Patent ID: 7319129

Claim:
A silsesquioxane derivative represented by Formula (1): wherein each R is a group independently selected from hydrogen, alkyl having 1 to 45 carbon atoms in which any hydrogen may be replaced by fluorine and any —CH 2 — may be replaced by —O—, —CH═CH—, cycloalkylene or cycloalkenylene, substituted or unsubstituted aryl, and arylalkyl composed of a substituted or unsubstituted aryl group and an alkylene group in which any hydrogen may be replaced by fluorine and any —CH 2 — may be replaced by —O—, —CH═CH— or cycloalkylene; at least one Y is a group selected from the group represented by Formula (2), and the other Y is hydrogen; when at least two Y's are a group represented by Formula (2), then they may be the same group or may be composed of at least two different groups; wherein R 1 and R 2 are independently a group defined similarly to R; and Z is a group defined similarly to R, or a functional group, or a group having a functional group.