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US 4,049,632 AGranted
Chain extending polyurethanes with a large excess of water
AssigneeArmstrong Cork Company
InventorsAlan B. Magnusson, Howard S. White
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Abstract
A polyurethane-urea composition is described that is highly resistant to textile fiber-dressings. The composition is a product from the reaction of an ester urethane prepolymer formed from the reaction of a diisocyanate and a hydroxy-terminated polyester of equivalent weight 400-1,000 in which the ratio of isocyanate functionality:hydroxy functionality is from 2.0:1 to 4.0:1; and an excess of water.
Claims6
A method of producing a polyurethane-urea elastomer resistant to textile fiber dressing solvents which comprises the steps of:
- a. reacting a prepolymer having terminal isocyanate groups obtained by reacting
- 1. a diisocyanate selected from the group consisting of xylylene diisocyanate, toluene diisocyanate, diisocyanato cyclohexyl methane and isophorone diisocyanate;
- with
- 2. a difunctional, hydroxy-terminated polyester of equivalent weight 480-540,
- without solvent, in a low-intensity mixer with:
- b. water,
- wherein the quantity of said water is 3-20 times greater than necessary to react with said terminal isocyanate groups.
4 more elements
Dependencies are inferred from the claim text.