Thermoplastic polyurethanes prepared with small amounts of monohydric alcohols
AssigneeThe Upjohn Company
InventorsHenry W. Bonk, Benjamin S. Ehrlich, Joseph Pleckaitis
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Abstract
The processing temperatures of thermoplastic polyurethane elastomers are reduced, and the extrudability and the sensitivity to degradation by shear and by moisture are improved, by including a minute proportion (from 0.0005 to 0.05 equivalents, per equivalent of isocyanate) of a monohydric aliphatic alcohol in the reaction mixture (diisocyanate, polymeric diol and difunctional extender) employed to prepare thermoplastic polyurethane elastomers by the one-shot procedure.
Claims8
A thermoplastic polyurethane elastomer which is the product of a one-shot reaction of an organic diisocyanate, a polymeric diol, a difunctional extender and from 0.0005 equivalents to 0.05 equivalents, per equivalent of said diisocyanate, of a monohydric alcohol selected from the class consisting of dodecyl alcohol, stearyl alcohol, and the monobutyl ether of diethylene glycol.
A thermoplastic polyurethane elastomer which is the product of a one-shot reaction of:
- (a) 4,4'-methylenebis(phenyl isocyanate);
- (b) a polymeric diol having a molecular weight in the range of 500 to 3000;
- (c) a diol extender;
- and
- (d) from 0.0005 to 0.05 equivalents, per equivalent of said isocyanate, of a monohydric aliphatic alcohol selected from the class consisting of dodecyl alcohol, stearyl alcohol and the monobutyl ether of diethylene glycol;
- the ratio of isocyanate groups to hydroxyl groups being within the range of about 0.95:1 to about 1.10:1.
Dependencies are inferred from the claim text.