Patent ID: 8754179
Filing Date: 2014-06-17
Classification: C08F,C08G

Abstract:
1. A thermoset cross-linked polymer network comprising polymerized units of (a) 30-70% by weight of a coumarin derivative photo reactive monomer, (b) 30-70% by weight of at least one additional monomer, and (c) more than 0% by weight less than 5% by weight of a crosslinking agent; said thermoset polymer network having a first initial crosslink density due to (c) the crosslinking agent and a second, photo-reversible crosslink density created upon exposure to a predetermined wavelength of light, and wherein the coumarin derivatives have the form: wherein R1 is C1-C12 alkylene, arylene, or a bond, wherein R3 can be H, C1-C12 alkyl or aryl, wherein X can be O, S, HN, or a bond, and wherein R2 is a residue of a polymerizable group which copolymerizes with the (b) at least one additional monomer to form the thermoset cross-linked polymer network, wherein the thermoset cross-linked polymer network is an epoxy resin, oxetane resin, or polyurethane resin.