Patent ID: 8710121
Filing Date: 2014-04-29
Classification: B29C,B29K,C08G,C08J,C08K,C08L,Y02A

Abstract:
1. A biaxially oriented polyester film comprising (i) polyester, (ii) 0.25-6% by weight, based on the weight of the film, of hydrolysis stabilizer based on epoxidized fatty acid esters and/or epoxidized fatty acid glycerides, and (ii) a chain extender having a polymer of formula 5 where R R x and y are each independently selected from 0 to 100, x+y is greater than 0 and z is from 2 to 100; wherein the sum of the hydrolysis stabilizer and the chain extender ranges from at least 1% by weight to less than 12% by weight, based on the weight of the film; and wherein more than 80% by weight of the epoxidized fatty acid glycerides are mixtures of glyceryl esters of the formula 1: CH where the R where R m=1-40 n=0-10 o=0-4