Patent ID: 7799838

Claim:
A composition comprising (1) from 50 to 99 wt % of a modified, random copolyetherester containing: (i) a modified, random polybutylene terephthalate copolymer block that is derived from a depolymerized polyethylene terephthalate component selected from the group consisting of polyethylene terephthalate, polyethylene terephthalate copolymers, and combinations thereof; and that contains at least one residue derived from the depolymerized polyethylene terephthalate component; and (ii) a polyalkylene oxide copolymer block that is derived from the depolymerized polyethylene terephthalate component and polyalkylene oxide glycol, and contains polyalkylene oxide and at least one residue derived from the depolymerized polyethylene terephthalate component; wherein the residues comprise diethylene glycol groups present in the copolyetherester in an amount from 0.1 to 10 mole %, based on 100 mole % of glycol groups in the copolyetherester; and (2) from 1 to 50 wt % of a modified, random polybutylene terephthalate copolymer that is derived from a depolymerized polyethylene terephthalate component selected from the group consisting of polyethylene terephthalate, polyethylene terephthalate copolymers, and combinations thereof; and that contains at least one residue derived from the depolymerized polyethylene terephthalate component; wherein the copolyetherester, the modified, random polybutylene terephthalate copolymer, and optionally any additives, are present in a total amount of 100 wt %; and wherein the copolyetherester has (a) long chain ester units having the formula: wherein G is the divalent polyalkylene oxide radical remaining after removal of the terminal hydroxyl groups from a poly(butylene oxide) glycol having a number-average molecular weight of 100 to 5000 daltons; and R′ is the divalent terephthalic radical remaining after removal of the carboxyl groups from a terephthalic dicarboxylic acid; and R″ is a divalent isophthalic radical remaining after removal of the carboxyl groups from an isophthalic dicarboxylic acid; and (b) short-chain ester units having the formula: wherein D is the divalent butylene radical remaining after removal of the hydroxyl groups from butanediol having a molecular weight of less than 150; and R′ and R″ are as defined above; and wherein D′ is a divalent ethylene or diethylene radical after removal of hydroxyl groups of ethylene glycol or diethylene glycol; wherein the composition has a modulus of elasticity at least 8.3% greater than the composition in which the copolyetherester is not derived from a depolymerized polyethylene terephthalate component, when the compositions are aged for 1000 hours at 140° C.