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US 6,350,821 B1Granted
Matte powder coating
AssigneeBASF SE
InventorWilliam H. Alford
Life of this patent
Estimating the term…
Abstract
A matte powder coating composition including a first carboxyl-functional polyester resin, a second carboxyl-functional polyester resin, and an epoxide-functional crosslinking agent, where the difference in acid values between the first and second carboxyl-functional polyester resins is from about 200 to about 350 mg KOH/g.
Claims28
A matte powder coating composition comprising:
- (a) a first carboxyl-functional polyester resin;
- (b) a second carboxyl-functional polyester resin having an acid value of at least about 300 mg KOH/g;
- and
- (c) an epoxide-functional crosslinking agent;
- wherein the difference in acid values between said first and second carboxyl-functional polyester resins is from about 200 to about 350 mg KOH/g.
2 more elements
A matte powder coating composition comprising:
- (a) a first carboxyl-functional polyester resin having an acid value of from about 30 to about 80 mg KOH/g;
- (b) a second carboxyl-functional polyester resin having an acid value of from about 300 to about 330 mg/KOH/g;
- and
- (c) an epoxide-functional crosslinking agent;
- wherein said first and second carboxyl-functional polyester resins are extruded together in a single step process.
2 more elements
A method of preparing a matte powder coating composition comprising the steps of:
- (a) blending together two carboxyl-functional polyester resins, one of which has an acid value of at least about 300 mg KOH/g, and an epoxide-functional crosslinking agent, producing a substantially homogeneous mixture;
- and
- (b) extruding said mixture in a single step process;
- wherein the difference in acid values between said two carboxyl-functional polyester resins is from about 200 to about 350 mg KOH/g.
1 more element
A coated substrate coated by the method comprising the steps of:
- (a) applying a matte powder coating composition to said substrate, wherein said matte powder coating composition comprises a first carboxyl-functional polyester resin, a second carboxyl-functional polyester resin having an acid value of at least about 300 mg KOH/g, and an epoxide-functional crosslinking agent, wherein the difference in acid values between said first and second carboxyl-functional polyester resins is from about 200 to about 350 mg KOH/g;
- and
- (b) curing said matte powder coating composition.
Dependencies are inferred from the claim text.