Blocked isocyanates
AssigneeThe Baxenden Chemical Co.
InventorsAnthony H. Hughes, Arthur Topham
Life of this patent
Estimating the term…
Abstract
A blocked polyisocyanate of the formula R-Y.sub.m where R is an m valent aliphatic, cycloaliphatic, heterocyclic or aromatic residue; each Y, which may be the same or different, is ##STR1## where R.sub.1 is, or, when n is more than 1, each R.sub.1, which may be the same or different, is an alkyl, alkenyl, aralkyl, N-substituted carbamyl, phenyl, NO.sub.2, halogen or ##STR2## group where R.sub.2 is a C.sub.1 -C.sub.4 alkyl group; n is 0, 1, 2 or 3; and m is an integer greater than 1 is useful in paint compositions.
Claims16
In a storage-stable coating composition comprising an active hydrogen-containing compound and a blocked polyisocyanate of the formula:
- R-Y.sub.m
- wherein R is an m valent aliphatic, cycloaliphatic, heterocyclic or aromatic residue, m is an integer greater than 1 and Y is a blocking group, the improvement whereby said composition is curable by heat unblocking at 100.degree. C. to 120.degree. C., and each Y, which may be the same or different, is ##STR7## wherein R.sub.1 is, or, where n is more than 1, each R.sub.1, which may be the same or different, is a C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.4 alkenyl, phenyl C.sub.1 -C.sub.4 alkyl, phenyl, NO.sub.2,<halogen or ##STR8## group where R.sub.2 is a C.sub.1 -C.sub.4 alkyl group;
- and n is 0, 1, 2 or 3, provided that, when R is an aromatic residue the groups Y are not directly attached to an aromatic nucleus.
Dependencies are inferred from the claim text.