Thermosetting polyurethane compositions
AssigneeAmerican Cyanamid Company
InventorGirish G. Parekh
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Abstract
Thermosetting polyurethane compositions comprising a polymer having a molecular weight of from 500 to 10,000 and containing from about 0.3 to about 15 percent by weight of one or more functional groups selected from the group consisting of --OH, --COOH, --CONH.sub.2 and ##STR1## and a mixture of monomeric and oligomeric polyfunctional substituted urethane compounds, which may be derived by reaction of a polyol and isocyanic acid, followed by methylolation and alkylation. Such compositions may be cured at elevated temperatures to produce solvent-resistant coatings.
Claims4
A polyurethane coating formed on a substrate by curing thereon a thermosetting polyurethane composition comprising:
- (a) a polymer having molecular weight of from 500 to 20,000 and containing from about 0.3 to about 15 percent by weight based on total weight of said polymer, of one or more free functional groups selected from --OH, COOH, --CONH.sub.2 and ##STR14## (b) a mixture of monomeric and oligomeric polyfunctional substituted urethane compounds, selected from the groups consisting of:
- (i) monomeric compounds of the formula:
- ##STR15## wherein A is a di- to hexavalent organic moiety;
- X is an integer from 2 to 6;
- R.sub.1 is hydrogen, --CH.sub.2 OH or --CH.sub.2 OR.sub.3 ;
- R.sub.2 is --CH.sub.2 OH or --CH.sub.2 OR.sub.3 ;
- and
- R.sub.3 is C.sub.1 to C.sub.4 alkyl,
- and (ii) oligomeric compounds of the formula ##STR16## wherein:
- A, R.sub.1 and R.sub.2 are as defined in (i)
- n is an integer from 1 to 5
- w is an integer from 2 to 4
- Y is an integer from 1 to 5.
Dependencies are inferred from the claim text.