Patent ID: 7772690

Claim:
An insulating film for semiconductor devices obtained by curing, on a substrate, a high molecular compound obtained by polymerizing a cage-type silsesquioxane compound having two or more unsaturated groups as substituents and having a cyclic siloxane structure, wherein: the structure of the cage-type silsesquioxane compound is not broken by curing; the cage-type silsesquioxane compound has m number of RSi(0 0.5 ) 3 units, in which m stands for an integer of from 8 to 16, and Rs each independently represent a non-hydrolyzable group, with the proviso that at least two of Rs are each a vinyl- or ethynyl-containing group; each of the units is linked to another unit via an oxygen atom possessed in common and constitutes the cage structure; and at least two of Rs are vinyl groups.