Polyamideimide resin and use thereof
A polyamideimide resin having an isocyanate group blocked with a compound selected from the group consisting of alcohols, oximes and lactams, and having a carboxyl group blocked with a vinyl ether group-containing compound.
1. A method for producing a polyamideimide resin comprising:
reacting a polyvalent isocyanate and a tribasic acid anhydride and/or tribasic acid halide in an N-formyl group-containing solvent at a temperature of 70 to 80° C. to obtain a polyamideimide resin having an isocyanate group and a carboxyl group,
blocking the isocyanate group of the polyamideimide resin with a compound selected from the group consisting of alcohols, oximes and lactams, and blocking the carboxyl group with a vinyl ether group-containing compound,
wherein the reaction between the polyvalent isocyanate and the tribasic acid anhydride and/or tribasic acid halide is performed by using at least one catalyst selected from the group consisting of tertiary amines, and the reaction temperature does not exceed 80° C.
2. A method for producing a polyamideimide resin comprising:
reacting a polyvalent isocyanate having an isocyanate group that has been blocked with a compound selected from the group consisting of alcohols, oximes and lactams, with a tribasic acid anhydride and/or tribasic acid halide having a carboxyl group that has been blocked with a vinyl ether group-containing compound, in an N-formyl group-containing solvent at a temperature of 70 to 80° C. to obtain a polyamideimide resin,
wherein the reaction between the polyvalent isocyanate and the tribasic acid anhydride and/or tribasic acid halide is performed by using at least one catalyst selected from the group consisting of tertiary amines, and the reaction temperature does not exceed 80° C.
3. The method for producing a polyamideimide resin according to claim 1 , wherein the compound for blocking the isocyanate group comprises a ketoxime represented by:
CRR′═N—OH, (Formula 1)
wherein each of R and R′ independently represents an alkyl group of 1 to 6 carbon atoms.
4. The method for producing a polyamideimide resin according to claim 1 , wherein the vinyl ether group-containing compound comprises an alkyl vinyl ether represented by:
CH 2 ═CH—O—R, (Formula 2)
wherein R represents an alkyl group of 1 to 10 carbon atoms.
5. The method for producing a polyamideimide resin according to claim 2 , wherein the compound for blocking the isocyanate group comprises a ketoxime represented by:
CRR′═N—OH, (Formula 1)
wherein each of R and R′ independently represents an alkyl group of 1 to 6 carbon atoms.
6. The method for producing a polyamideimide resin according to claim 2 , wherein the vinyl ether group-containing compound comprises an alkyl vinyl ether represented by:
CH 2 ═CH—O—R, (Formula 2)
wherein R represents an alkyl group of 1 to 10 carbon atoms.