Liquid coatings for bridge deckings and the like
AssigneeW. R. Grace & Co.-Conn.
InventorsCung Vu, Timothy J. Martin, Andrew M. Gillanders, Bassam Sbaiti
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Abstract
Novel polyurethane formulations especially useful as membranes for the protection of bridge deckings. The polyurethane is prepared by mixing two components, A and B. Component A comprises castor oil, a low molecular weight polyol having a molecular wieght between 92 and about 200, preferably with an elastomer. Component B is a modified MDI, being either (i) a mix of 4,4'- and 2,4'-isomers of diphenylmethane diisocyanate or (ii) a diphenylmethane diisocyanate and its reaction product with a low molecular weight poly(oxyalkylene).
Claims34
Composition consisting essentially of two separate components, A and B;
- Component A consisting essentially of, in parts by weight, (i) about 90 - 140 parts of castor oil;
- (ii) a low molecular weight polyol having at least 3 hydroxyl groups and a molecular weight between 92 and about 200, 2 - 10 parts;
- and (ii) an elastomer, about 0 - 120 parts;
- Component B, about 40 - 120 parts;
- being a polyisocyanate of the group consisting of (i) isomers of diphenylmethane diisocyanate and (ii) a mixture of diphenylmethane diisocyanate and the reaction product of diphenylmethane diisocyanate with an alkylene oxide adduct of a polyol.
Dependencies are inferred from the claim text.