Oil and water resistant polyurethane resin and polyol composition useful to make the same
AssigneeMinnesota Mining and Manufacturing Company
InventorsJohn A. Harrison, Chung I. Young, Stewart P. Lee
Life of this patent
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Abstract
Polyurethanes resistant to swelling in water and oil, particularly cooking oils, are derived from the polymerization of organic polyisocyanate and a novel polyol composition comprising hydroxyl-terminated poly(haloalkylene ether) and hydroxyl-terminated halogen-free aliphatic compound.
Claims20
A polyurethane resin which is substantially non-swelling when contacted with oil or water, said composition comprising the reaction product of:
- (1) organic polyisocyanate, and
- (2) a polyol composition comprising:
- (a) hydroxyl-terminated poly(haloalkylene ether) having a number average molecular weight of about 500 to 5000;
- and
- (b) hydroxyl-terminated halogen-free aliphatic compound having a number average molecular weight of about 32 to 6000,
- wherein
- the hydroxyl equivalents in said hydroxyl-terminated compounds and the isocyanate equivalents in the organic polyisocyanate provide an NCO:OH ratio of from about 0.8:1 to about 1.4:1;
- said hydroxyl-terminated poly(haloalkylene ether) provides 5 to 40% of the total hydroxyl equivalents and said hydroxyl-terminated halogen-free aliphatic compound provides correspondingly 95 to 60% of the total hydroxyl equivalents;
- 5 to 75% of the total hydroxyl equivalents of said hydroxyl-terminated compounds have 3 to 6 hydroxyl groups and 10 to 90% of the hydroxyl groups present in said hydroxyl-terminated compounds have 1 or 2 hydroxyl groups of which no more than 25% have only 1 hydroxyl group;
- and
- at least 25% by weight of the hydroxyl-containing compounds have a molecular weight of at least 500.
A polyol composition suitable for reaction with polyisocyanate to form a polyurethane resin which is substantially resistant to swelling when contacted with oil and water comprising:
- (1) hydroxyl-terminated poly(haloalkylene ether) having a number average molecular weight of about 500 to 5000 and
- (2) hydroxyl-terminated halogen-free aliphatic compound having a number average molecular weight of about 32 to 6000, wherein
- said hydroxyl-terminated poly(haloalkylene ether) provides 5 to 40% of the total hydroxyl equivalents and said hydroxyl-terminated halogen-free aliphatic compound provides correspondingly 95 to 60% of the total hydroxyl equivalents;
- 5 to 75% of the total hydroxyl equivalents of said hydroxyl-terminated compounds have 3 to 6 hydroxyl groups and 10 to 90% of the hydroxyl groups present in said hydroxyl-terminated compounds have 1 or 2 hydroxyl groups of which no more than 25% have only 1 hydroxyl group;
- and
- at least 25% by weight of the hydroxyl-containing compounds have a molecular weight of at least 500.
Dependencies are inferred from the claim text.