The Upjohn Co.

Joseph Pleckaitis

Henry W Bonk

Benjamin S Ehrlich

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.

Thermoplastic polyurethanes prepared with small amounts of monohydric

The processing temperatures of thermoplastic polyurethane elastomers are reduced, and the extrudability and sensitivity to shear and moisture are improved, by employing as the diisocyanate, in the preparation of said elastomers, the product obtained by reacting 4,4'-methylenebis(phenyl isocyanate) with a monohydric aliphatic alcohol. Use of the latter also counteracts batch-to-batch variations in reactivity of 4,4'-methylenebis(phenyl isocyanate).

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North Haven, CT, United States of America

Joseph Pleckaitis