Composition for powder coating material, powder coating material, and coated article

Patent metadata

Field	Value
Publication number	US-2016362559-A1
Application number	US-201615247260-A
Country	US
Kind code	A1
Filing date	Aug 25, 2016
Priority date	Jul 1, 2014
Publication date	Dec 15, 2016
Grant date	—

Abstract

To provide a composition for powder coating material which can be sufficiently pulverized, and with which a powder coating material capable of forming a coating film excellent in weather resistance and adhesion to the substrate can be obtained; a powder coating material capable of forming a coating film excellent in weather resistance and adhesion to the substrate; and a coated article having a coating film excellent in weather resistance and adhesion to the substrate, on its surface. A composition for powder coating material comprising a polyvinylidene fluoride (A) having a melting point of from 151 to 200° C., and an acrylic resin (B) having a glass transition temperature of from 40 to 90° C. A powder coating material comprising the composition for powder coating material, and a coated article having a coating film formed of the powder coating material.

First claim

What is claimed is:

1 . A composition for powder coating material comprising the following polyvinylidene fluoride (A) and the following acrylic resin (B):
polyvinylidene fluoride (A): a polyvinylidene fluoride having a melting point of from 151 to 200° C.; acrylic resin (B): an acrylic resin having a glass transition temperature of from 40 to 90° C.

2 . The composition for powder coating material according to claim 1 , wherein the acrylic resin (B) comprises units derived from methyl methacrylate and units derived from ethyl methacrylate, and
the proportion of the units derived from methyl methacrylate to the units derived from ethyl methacrylate [(methyl methacrylate units)/(ethyl methacrylate units)] is from 50/50 to 90/10 (molar ratio).

3 . The composition for power coating material according to claim 1 , wherein the difference between the melting point of the polyvinylidene fluoride (A) and the glass transition temperature of the acrylic resin (B) is from 65 to 150° C.

4 . The composition for powder coating material according to claim 1 , wherein the content of the polyvinylidene fluoride (A) is from 30 to 95 parts by mass in the total of 100 parts by mass of the polyvinylidene fluoride (A) and the acrylic resin (B).

5 . A powder coating material comprising a powder composed of the composition for powder coating material as defined in claim 1 .

6 . A powder coating material comprising a first powder composed of the composition for powder coating material as defined in claim 1 , and
a second powder composed of a composition for powder coating material which contains at least one resin (C) selected from the group consisting of an acrylic resin, a polyester resin, an urethane resin, an epoxy resin and a silicone resin and which contains no fluororesin.

7 . The powder coating material according to claim 6 , wherein the mixing ratio of the first powder to the second powder ((the first powder)/(the second powder)) is from 10/90 to 90/10 (mass ratio).

8 . A coated article having a coating film formed of the powder coating material as defined in claim 5 , on the surface of a substrate.

9 . The coated article according to claim 8 , wherein the material for the substrate is aluminum or aluminum alloy surface-treated with a chemical conversion treatment agent.

10 . The coated article according to claim 9 , wherein the chemical conversion treatment agent is a zirconium-type treatment agent or a titanium-type treatment agent, which does not contain chromium.

11 . The coated article according to claim 8 , which further has, between the surface of the substrate and the coating film formed of the powder coating material, a primer layer composed of at least one primer selected from the group consisting of an acrylic resin, a polyester resin and an epoxy resin.

Assignees

• Asahi Glass Co Ltd

Inventors

• Saito Shun
• Alkawa Masataka

Classifications

• C23C4/12

  characterised by the method of spraying · CPC title

• B05D1/04

  involving the use of an electrostatic field {(B05D1/025 and B05D1/14 take precedence)} · CPC title

• B05D2202/25

  based on Al · CPC title

• B05D3/0254

  After-treatment · CPC title

• C09D183/00

  Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers · CPC title