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US 5,290,632 AGranted
Liquid coatings for cast iron
AssigneeW. R. Grace & Co.-Conn.
InventorsJalandar Y. Jadhav, Cung Vu
Life of this patent
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Abstract
Novel polyurethane formulations especially useful as coating for the protection of ductile cast iron pipes. The polyurethane is prepared by mixing two components, A and B. Component A comprises castor oil, a low molecular weight polyol having a molecular weight between 76 and about 450, preferably with an elastomer. Component B is a polymeric MDI.
Claims30
Composition consisting essentially of two separate components, A and B;
- Component A consisting essentially of, in parts by weight, (i) about 100-130 parts of castor oil;
- (ii) a low molecular weight polyol having at least 2 hydroxyl groups and a molecular weight between 76 and about 450, 12-90 parts;
- and (ii) an elastomer, about 20-50 parts;
- Component B, about 50-110 parts;
- being a polymeric polyisocyanate having an average molecular weight of about 340-380 and a functionality of about 2.6-2.7.
2 more elements
Process of coating a substrate comprising applying thereto a resin, the resin being obtained by reacting Component A with Component B, wherein
- Component A consisting essentially of, in parts by weight, (i) about 100-130 parts of castor oil;
- (ii) a low molecular weight polyol having at least 2 hydroxyl groups and a molecular weight between 76 and 450, 12-90 parts;
- and (iii) an elastomer, about 20-50 parts;
- Component B, about 50-110 parts;
- being a polymeric polyisocyanate having an average molecular weight of about 340-380 and a functionality of about 2.6-2.7.
2 more elements
Dependencies are inferred from the claim text.