Patent ID: 6228918
Filing Date: 2001-05-08
Classification: C08K

Abstract:
A process for controlling theshelf life of a formulation comprising an unsaturated polyester which can be molded into work parts under molding conditions comprising a temperature between 65-95.degree. C. and at 0.7-3.5 megapascals (Mpa) for 5-20 minutes, during which the polyester is molded and crosslinked, which process further comprisesformulating the unsaturated polyester with an initiator and admixing the unsaturated polyester with a combination comprising two reagents, wherein one of said two reagents scavenges free radicals generated at a first temperature between 25 to 50 degrees and a second scavenger which scavenges free radicals at a second temperature which is above said first temperature, and thus reducing the degree of crosslinking, prior to said molding conditions, wherein the two reagents comprise parabenzoquinone in combination with di-tertiary-butylhydroxytoluene.