Polyurethanes made with polydiene diols, diisocyanates, and dimer diol chain extender
AssigneeShell Oil Company
InventorsMichael Alan Masse, Dale Lee Handlin, Jr.
Life of this patent
Estimating the term…
Abstract
The present invention is polyurethane compositions comprising from 1 to 80% by weight of a polydiene diol having from 1.6 to 2, more preferably 1.8 to 2, and most preferably 1.9 to 2, terminal hydroxyl groups per molecule and a number average molecular weight between 500 and 20,000, more preferably between 1,000 and 10,000, from 20 to 99% by weight of a hard segment comprised of an isocyanate having two isocyanates groups per molecule and dimer diol as a chain extender. The polyurethane compositions described herein are stronger than other polydiene diol-based polyurethane compositions.
Claims8
A compatible composition for making thermoplastic polyurethanes, comprising:
- (a) from 1 to 80% by weight of a polydiene diol having from 1.6 to 2 terminal hydroxyl groups per molecule and a number average molecular weight between 500 and 20,000;
- (b) from 20 to 99% by weight of a hard segment comprised of an isocyante having two isocyanate groups per molecule and dimer diol as a chain extender;
- and
- (c) an additional chain extender which is, by itself, incompatible with the polydiene diol, the isocyanate compound, and/or mixtures thereof.
Dependencies are inferred from the claim text.