Polyamideimide resin and coating material

Patent metadata

Field	Value
Publication number	US-11214709-B2
Application number	US-201615781224-A
Country	US
Kind code	B2
Filing date	Dec 5, 2016
Priority date	Dec 14, 2015
Publication date	Jan 4, 2022
Grant date	Jan 4, 2022

Abstract

A polyamideimide resin having isocyanate groups at the terminals, wherein at least a portion of the isocyanate groups are blocked with an ether group-containing cyclic amine.

First claim

The invention claimed is:

1. A coating material comprising a polyamideimide resin, a curing agent, and a solvent,
wherein the polyamideimide resin has isocyanate groups at terminals, and at least a portion of the isocyanate groups are blocked with at least 0.02 mol and not more than 0.15 mol of an ether group-containing cyclic amine per 1 mol of the polyamideimide resin,
wherein an amount of the curing agent is from 1 to 15 parts by mass, per 100 parts by mass of the polyamideimide resin,
wherein the solvent consists essentially of the ether group-containing cyclic amine, and
wherein the polyamideimide resin is produced by reacting one or more diisocyante compounds in the presence of the solvent under conditions that a molar ratio of the solvent to the one or more diisocyanate compounds ranges from 5.62 to 8.94.

2. The coating material according to claim 1 , wherein the polyamideimide resin has a number average molecular weight of 12,000 to 30,000.

3. The coating material according to claim 1 , wherein the curing agent comprises at least one selected from the group consisting of epoxy resins, phenol resins, melamine resins, and isocyanate compounds.

4. The coating material according to claim 2 , wherein the curing agent comprises at least one selected from the group consisting of epoxy resins, phenol resins, melamine resins, and isocyanate compounds.

5. A coating material comprising a polyamideimide resin, a curing agent, and a solvent,
wherein the polyamideimide resin has isocyanate groups at terminals, and at least a portion of the isocyanate groups are blocked with at least 0.02 mol and not more than 0.15 mol of an ether group-containing cyclic amine per 1 mol of the polyamideimide resin,
wherein an amount of the curing agent is from 1 to 15 parts by mass, per 100 parts by mass of the polyamideimide resin,
wherein the solvent comprises the ether group-containing cyclic amine,
wherein the coating material comprises no co-solvent, and
wherein the polyamideimide resin is produced by reacting one or more diisocyante compounds in the presence of the solvent under conditions that a molar ratio of the solvent to the one or more diisocyanate compounds ranges from 5.62 to 8.94.

6. The coating material according to claim 5 , wherein the polyamideimide resin has a number average molecular weight of 12,000 to 30,000.

7. The coating material according to claim 5 , wherein the curing agent comprises at least one selected from the group consisting of epoxy resins, phenol resins, melamine resins, and isocyanate compounds.

8. The coating material according to claim 6 , wherein the curing agent comprises at least one selected from the group consisting of epoxy resins, phenol resins, melamine resins, and isocyanate compounds.

9. The coating material according to claim 1 , wherein the amount of the curing agent is from 5 to 15 parts by mass, per 100 parts by mass of the polyamideimide resin.

10. The coating material according to claim 5 , wherein the amount of the curing agent is from 5 to 15 parts by mass, per 100 parts by mass of the polyamideimide resin.

11. The coating material according to claim 1 , wherein the ether group-containing cyclic amine includes a compound having a morpholine ring, a tetrahydro-1,3-oxazine ring, a tetrahydro-1,2-oxazine ring, or an oxazolidine ring.

12. The coating material according to claim 1 , wherein the ether group-containing cyclic amine includes any one or more of morpholine, 4-methylmorpholine, 4-ethylmorpholine, N-formylmorpholine, and N-acetylmorpholine.

13. The coating material according to claim 1 , wherein the curing agent comprises a melamine resin.

14. The coating material according to claim 1 , wherein at least a portion of the isocyanate groups are blocked with at least 0.05 mol and not more than 0.15 mol of an ether group-containing cyclic amine per 1 mol of the polyamideimide resin.

15. The coating material according to claim 5 , wherein at least a portion of the isocyanate groups are blocked with at least 0.05 mol and not more than 0.15 mol of an ether group-containing cyclic amine per 1 mol of the polyamideimide resin.

Assignees

• Hitachi Chemical Co Ltd
• Showa Denko Materials Co Ltd

Inventors

• Saito Yasuyuki
• Takahashi Atsushi
• Harada Yuta

Classifications

• C08G18/7685

  containing two or more non-condensed aromatic rings directly linked to each other · CPC title

• C09D179/08 Primary

  Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors · CPC title

• C08G18/345

  having three carboxylic acid groups · CPC title

• C08G18/34

  Carboxylic acids; Esters thereof with monohydroxyl compounds · CPC title

• C09D7/65

  macromolecular (C09D7/41-C09D7/48 take precedence) · CPC title