RADICAL POLYMERIZATION INITIATOR, MULTI-BRANCHED POLYMER, VARNISH, ADHESIVE AGENT, COATING MATERIAL, SEALING MATERIAL, AND ELECTRONIC DEVICE

摘要

The purpose of the present invention is to synthesize a multi-branched polymer having uniform molecular chain lengths and having no defect in branches without requiring purification. A radical polymerization initiator represented by the formula shown below (formula 1), said radical polymerization initiator being characterized in that n is a natural number of 3 or greater, Y represents a polyfunctional unsaturated compound, R represents a hydrocarbon group, X1 in the B-X1 (boron-X1) bond represents an alkoxy group or a phenyl group, and X2 in the B-X2 (boron-X2) bond represents an alkoxy group or a phenyl group.