Chemistry of carbon compounds – Miscellaneous organic carbon compounds
Patent
1974-04-25
1976-01-13
Cockeram, H. S.
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
260 775AN, C08G 1861, C08K 334
Patent
active
039323374
ABSTRACT:
A thermoplastic polyester urethane molding composition 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 maintaining a mole ratio of isocyanate to isocyanate-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 certain physical properties of the reaction product such as tensile and modulus of elasticity.
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Union Carbide New Product Data: Niax.sup.(R) Caprolactone Polyols for Moisture-Cure Urethane Coatings, Oct., 1967.
Phillips, L. N. and D. B. V. Parker, Polyurethanes, Iliffe Books Ltd., (London 1964), pp. 71-72.
Abrams Alan M.
Cockeram H. S.
Hutchinson John L.
The Richardson Company
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