Poly(amide-imide) resin composition and fluorochemical coating material
A polyamideimide resin composition containing: (A) a polyamideimide resin which has isocyanate groups at the terminals and in which at least a portion of the isocyanate groups are blocked with a blocking agent selected from the group consisting of alcohols, oximes and lactams, (B) N-formylmorpholine, and (C) water.
1. A fluorochemical coating material comprising a fluororesin and a polyamideimide resin composition comprising: (A) a polyamideimide resin which has isocyanate groups at terminals and in which at least a portion of the isocyanate groups are blocked with a blocking agent selected from the group consisting of alcohols, oximes and lactams, (B) N-formylmorpholine, and (C) water.
2. The fluorochemical coating material according to claim 1 , wherein a number average molecular weight of the polyamideimide resin (A) is from 5,000 to 50,000.
3. The fluorochemical coating material according to claim 1 , wherein an acid value of the polyamideimide resin (A), composed of a combination of carboxyl groups and other carboxyl groups formed as a result of ring-opening of acid anhydride groups, is from 10 to 80 mgKOH/g.
4. The fluorochemical coating material according claim 1 , wherein an amount of the water (C) is at least 10% by mass relative to a total mass of the composition.
5. A substrate having a coating film formed from the fluorochemical coating according to claim 1 on at least a portion of a surface of the substrate.
6. An article having a coating film formed from the fluorochemical coating according to claim 1 on at least a portion of a surface of the article.
7. A fluorochemical coating material comprising a blocked polyamideimide resin and a fluororesin, the blocked polyamideimide resin being produced using a method comprising:
reacting a diisocyanate compound and a tribasic acid anhydride and/or tribasic acid halide in an organic solvent containing N-formylmorpholine to produce a polyamideimide resin, and
blocking terminal isocyanate groups of the polyamideimide resin with a blocking agent selected from the group consisting of alcohols, oximes and lactams.
8. A substrate having a coating film formed from the fluorochemical coating material according to claim 7 on at least a portion of a surface of the substrate.
9. An article having a coating film formed from the fluorochemical coating material according to claim 7 on at least a portion of a surface of the article.
10. An article having a coating film formed from the fluorochemical coating according to claim 2 on at least a portion of a surface of the article.
11. An article having a coating film formed from the fluorochemical coating according to claim 3 on at least a portion of a surface of the article.
12. An article having a coating film formed from the fluorochemical coating according to claim 4 on at least a portion of a surface of the article.