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US 4,906,720 AGranted
Polyisocyanate prepolymer compositions and the use thereof in the preparation of polyurethanes
AssigneeImperial Chemical Industries PLC
InventorAlain Parfondry
Life of this patent
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Abstract
A polyisocyanate prepolymer composition comprising the reaction product of (a) an organic polyisocyanate or polyisocyanate mixture (b) a high molecular weight isocyanate-reactive compound or mixture thereof having a molecular weight from about 1,000 to 10,000 (c) a low molecular weight isocyanate-reactive compound or mixture thereof having a molecular weight of about 60 to below 1,000 wherein the weight ratio of low to high molecular weight compounds is in the range 40-1,000.
Claims11
A polyisocyanate prepolymer composition comprising the reaction product of:
- (a) an organic polyisocyanate or polyisocyanates mixture optionally comprising carbodiimide or uretonimine modified isocyanate groups, and having an isocyanate functionality of 2.0-4.0,
- (b) a high molecular weight isocyanate reactive compound or mixture thereof having a molecular weight from above 1,000 to 10,000 and a number average functionality of 1.8-5, and
- (c) a low molecular weight isocyanate reactive compound or mixture thereof, having a molecular weight from about 60 to below 1,000 and an average isocyanate-reactive functionality of 1.8 to 5.0. wherein the weight ratio of low to high Mw compounds is above 6.
Dependencies are inferred from the claim text.