Mouldable lactone polyester-urethane composition having low...

Details Mouldable lactone polyester-urethane composition having low... Mouldable lactone polyester-urethane composition having low...

C - Chemistry, Metallurgy

08

L

400/5333

C08L 75/06 (2006.01)

Patent

CA 1067241

ABSTRACT A thermoplastic polyester urethane molding composi- tion is disclosed having low compression set and high elastic modulus and which comprises the reaction product of a poly(epsilon-caprolactone)polymer, a hydroxy terminated polyol, an organic diisocyanate and a siloxane polymer. More specifically, by adding the siloxane polymer and main- taining a mole ratio of isocyanate to isocyanak-reactable hydroxy grouping in the range of from about 1.05 to about 1.3 or higher, it is possible to produce an improved molding composition having allophanate cross-links. The allophanate linkage breaks down at molding temperatures and reforms upon cooling thereby allowing an easily moldable thermoplastic urethane polyester which, after molding, will maintain its shape and have characteristics of a thermoset material. Additionally, the use of the siloxane polymer improves cer- tain physical properties of the reaction product such as tensile and modulus of elasticity.

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