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US 5,296,518 AGranted
Hydrophilic polyurethaneurea foams containing no toxic leachable additives and method to produce such foams
AssigneeHampshire Chemical Corp.
InventorsTimothy G. Grasel, Clifford A. Ferrin, James L. Guthrie, Clifton L. Kehr
Life of this patent
Estimating the term…
Abstract
Hydrophilic polyurethane urea foams which are made without toxic, leachable additives are disclosed. High molecular weight, isocyanate-terminated, ethylene oxide-rich prepolymers are used in place of surfactants to make the foams.
Claims24
A hydrophilic foam comprising the reaction product of
- (a) a first polyol having a hydroxyl functionality of at least 2 and a number average molecular weight in the range of 200 to 20,000 and which contains at least 40 mole percent oxyethylene,
- (b) a second polyol having a hydroxyl functionality in the range of about 3 to 8,
- (c) a triol or higher polyol made up of at least 75% oxyethylene monomers, having a molecular weight of about 7000 to about 30,000,
- (d) a polyisocyanate having an average isocyanate functionality in the range of about 2.0 to 2.8, and
- (e) a foaming promoter.
2 more elements
A hydrophilic foam comprising the reaction product of a polyurethane prepolymer (I), which is prepared from a reaction mixture comprising:
- (a) first polyol having a hydroxyl functionality of at least 2 and a number average molecular weight in the range of 200 to 20,000 and which contains at least 40 mole percent oxyethylene,
- (b) a second polyol having a hydroxyl functionality in the range of about 3 to 8 and
- (c) a polyisocyanate having an average isocyanate functionality in the range of about 2.0 to 2.8,
- with a biocompatible prepolymer (II), which is a triol or higher polyol made up of at least 75% oxyethylene monomers, said polyol having a molecular weight of about 7000 to about 30,000, said polyol having essentially all of the hydroxyl groups capped with aliphatic or cycloaliphatic polyisocyanates.
1 more element
Dependencies are inferred from the claim text.