Patent ID: 8895660
Filing Date: 2014-11-25
Classification: C08G,C08K,C08L,C09D

Abstract:
1. A method for preparing poly(butylene terephthalate-co-adipate) copolymer, the method comprising reacting (i) poly(butylene terephthalate-co-adipate) oligomers, wherein the oligomers comprise at least one polymer residue derived from a polyethylene terephthalate component selected from the group consisting of polyethylene terephthalate, polyethylene terephthalate copolymers, and combinations thereof, and a quencher selected from the group consisting of a phosphorus-containing compound, a nitrogen-containing compound, a boron-containing compound, and combinations thereof, with (ii) a chain extender selected from the group consisting of a polyisocyanurate, polyisocyanate, isocyanate, and combinations thereof under conditions sufficient to form the poly(butylene terephthalate-co-adipate) copolymer, wherein the copolymer has a melting temperature of 100 to 120° C.; a number average molecular weight of at least 30,000 g/mole; an intrinsic viscosity of at least 1.0 deciliter per minute; a T the copolymer comprises a residue derived from the polyethylene terephthalate component.