Surface active blocked isocyanates and coating compositions thereof
AssigneeAxalta Coating Systems IP Co., LLC
InventorJun Lin
Life of this patent
Estimating the term…
Abstract
Disclosed herein is a surface active adhesion promoting agent and a coating composition comprising the surface active adhesion promoting agent. The adhesion promoting agent is a blocked isocyanate functional siloxane containing material. Addition of small amount of the adhesion promoting agent to a coating composition, especially clearcoat compositions, helps to provide adhesion to a variety of materials that may be subsequently applied to the coating composition.
Claims9
A surface active adhesion promoting agent comprising at least a blocked isocyanate and a siloxane portion having at least two or more silicon atoms and a number average molecular weight in the range of from 500 to 4500, wherein said surface active adhesion promoting agent is of the formula;
- A-Si(X)3-qRq
- wherein q is 0, 1 or 2;
- A is G-C(O)NH—R1 and is attached to the silicon atom through R1;
- G is the residue of an isocyanate blocking agent;
- each X is independently chosen from the group consisting of OR2, OY, OSi(X′)2A or a hydrolysable group;
- wherein at least one of X is OY or OSi(X′)2A;
- Y is Si(Z)3-w(R3)w or Si(X′)2A;
- each X′ is independently chosen from the group consisting of OR2, OY or a hydrolysable group;
- each Z is independently chosen from the group consisting of OR4, OSi(X′)2A, OY, hydrolysable group or a silsesquioxane;
- R1 is a divalent organic radical consisting of an alkyl group having from 3 to 4 carbon atoms;
- each R, R2, R3 or R4 is independently chosen from the group consisting of C1 to C8 aliphatic group, C3 to C20 cycloaliphatic, alkylcycloaliphatic, cycloaliphaticalkyl group, C6 to C20 aryl group or a fluorine containing or perfluoro derivative thereof;
- w is 0, 1 or 2;
- and
- wherein A-Si(X)3-qRq has a molecular weight in the range of from 500 to 4500.
A coating composition comprising a surface active adhesion promoting agent wherein said surface active adhesion promoting agent comprises at least a blocked isocyanate and a siloxane portion having at least two or more silicon atoms and a number average molecular weight in the range of from 500 to 4500, wherein the surface active adhesion promoting agent is of the formula;
- A-Si(X)3-qRq
- wherein q is 0, 1 or 2;
- A is G-C(O)NH—R1 and is attached to the silicon atom through R1;
- G is the residue of an isocyanate blocking agent, wherein the blocking agent is chosen from the group selected from imidazole, 2-methyl imidazole, 4-methyl imidazole, pyrrole, pyrrolidine, morpholine, pyridine, piperidine, alkyl malonate, acetoacetic ester and cyanoacetic ester and a combination thereof;
- each X is independently chosen from the group consisting of OR2, OY, OSi(X′)2A or a hydrolysable group;
- wherein at least one of X is OY or OSi(X′)2A;
- Y is Si(Z)3-w(R3)w or Si(X′)2A;
- each X′ is independently chosen from the group consisting of OR2, OY or a hydrolysable group;
- each Z is independently chosen from the group consisting of OR4, OSi(X′)2A, OY, hydrolysable group or a silsesquioxane;
- R1 is a divalent organic radical consisting of an alkyl group having from 3 to 4 carbon atoms;
- each R, R2, R3 or R4 is independently chosen from the group consisting of C1 to C8 aliphatic group, C3 to C20 cycloaliphatic, alkylcycloaliphatic, cycloaliphaticalkyl group, C6 to C20 aryl group or a fluorine containing or perfluoro derivative thereof;
- w is 0, 1 or 2;
- and
- wherein A-Si(X)3-qRq has a molecular weight in the range of from 500 to 4500.
Dependencies are inferred from the claim text.