Patent ID: 8138299
Filing Date: 2012-03-20
Classification: C08G

Abstract:
1. A transparent thermoplastic polyurethane based on polyester diols (b), wherein (b) comprises a polyester diol (b1), which has a molecular weight in the range of from 2600 g/mol to 4000 g/mol, wherein (b1) is based on butane-1,4-diol and hexane-1,6-diol in a molar ratio of butane-1,4-diol:hexane-1,6-diol in the range of from 0.5:1 to 1.5:1 and adipic acid, and a polyester diol (b2) which has a molecular weight in the range from 1500 g/mol to 2500 g/mol, wherein (b2) is based on butane-1,4-diol and ethane-1,2-diol in a molar ratio of butane-1,4-diol:ethane-1,2-diol in the range from 0.5:1 to 1.5:1 and adipic acid, wherein the weight ratio of (b1) to (b2) is in the range of from 0.75:1 to 1.25:1, and wherein the transparent thermoplastic polyurethane has a hardness of from 50 Shore A to 80 Shore A.