A silsesquioxane derivative having a radically polymerizable functional group, its composition and a low-curing shrinkable cured film.

摘要

It aims at providing the novel compound which can provide low cure shrinkage, suppressing the fall of the hardness (abrasion resistance) of the cured film obtained from a resin composition. A silsesquioxane derivative having a radical polymerizable functional group represented by formula (1), formula (2), or formula (3). In the formulas (1) to (3), R1 is independently selected from alkyl having 1 to 45 carbon atoms, cycloalkyl having 4 to 8 carbon atoms, aryl having 6 to 14 carbon atoms, and arylalkyl having 7 to 24 carbon atoms. R 2 and R 3 are groups independently selected from alkyl having 1 to 10 carbons, cyclopentyl, cyclohexyl and phenyl, and X is independently hydrogen or a monovalent organic group. And at least one of X is a radically polymerizable functional group represented by the formula (4).