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US 5,574,083 AGranted
Aromatic polycarbodiimide crosslinkers
AssigneeRohm and Haas Company
InventorsWard T. Brown, James C. Day
Life of this patent
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Abstract
Disclosed are certain aromatic polycarbodiimides. Also disclosed is the use of an aromatic polycarbodiimide containing only aromatic carbodiimide groups as a cross-linker for a coating binder polymer bearing carboxyl groups.
Claims1
A stabilized composition comprising an aqueous dispersion of an aromatic polycarbodiimide having the formula of either
- E--O--{--Z--O--}.sub.m --C(O)N(A)--[--R--N.dbd.C.dbd.O--].sub.n --R'--N(A)C(O)--{--O--Z'--}.sub.p --O--E'
- or
- E--O--{--Z--O--}.sub.m --C(O)N(A)--[(--R--N.dbd.C.dbd.O--).sub.q --R'--N(A)C(O)--B--C(O)N(A)--].sub.t --R"--N(A)C(O)--{--O--Z'--}.sub.p --O--E'
- wherein m is an integer of from 5 to 10;
- n is an integer of from 2 to 7;
- p is an integer of from 5 to 10;
- q is an integer of from 1 to 5 and t is an integer of from 1 to 5, wherein the product of q and t is from 4 to 10;
- A is hydrogen;
- B is a group which does not contain carbodiimide groups;
- E and E' are CH.sub.3 ;
- R, R', and R" are independently selected from arylene, alkyl-substituted arylene, biarylene alkylene, or alkyl-substituted biarylene alkylene;
- and Z and Z' are C.sub.1 -C.sub.6 alkyl groups;
- and a stabilizer in an amount effective to enhance the stability of said polycarbodiimide, wherein said stabilizer is selected from the group consisting of hindered phenols, hindered nitroxyls, and mixtures thereof.
10 more elements
Dependencies are inferred from the claim text.