CLEAR HYDROPHOBIC TPU

摘要

A clear hydrophobic TPU is provided by reacting (a) a hydrophobic polyol made from dimerised fatty acid, (b) a chain extender mixture of a linear diol chain extender and a branched diol chain extender, and (c) a diisocyanate. The preferred polyol is a C36 dimer fatty acid reacted with 1,6-hexane diol. The preferred chain extender mixture is a 75:25 weight ratio blend of 1,12-dodecane diol and 2-butyl-2-ethyl propane diol. The preferred process to make the TPU is a batch process which starts the reaction between about 60° C. to 70° C.

主权项

1. A clear thermoplastic polyurethane polymer composition comprising the reaction product of:
(a) at least one hydrophobic polyol, wherein said hydrophobic polyol is a diacid polyester polyol made with dimerised fatty acids and wherein said dimerised fatty acid contains from 26 to 44 carbon atoms, (b) at least one linear diol chain extender having from 10 to 14 carbon atoms; (c) at least one branched diol chain extender having from 8 to 12 carbon atoms and wherein at least 2 carbon atoms of said branched chain extender are in the branch, wherein the weight ratio of said linear chain extender to said branched chain extender is from about 70:30 to about 85:15; (d) at least one diisocyanate; and (e) optionally at least one urethane catalyst.