AQUEOUS INTERMEDIATE COATING COMPOSITION AND METHOD FOR FORMING MULTILAYER COATING FILM
First Claim
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1. An aqueous intermediate coating composition comprising:
- (A) a resin containing hydroxyl and carboxyl groups with a hydroxyl value of 100 to 200 mg KOH/g and an acid value of 20 to 50 mg KOH/g;
(B) at least one curing agent selected from the group consisting of melamine resins and blocked polyisocyanate compounds; and
(C) flat pigment particles;
the molecular weight distribution of a curable resin component comprising component (A) and component (B) including from 30 to 50% by weight of a component with a molecular weight of less than 1,000, and 10% by weight or less of a component with a molecular weight exceeding 100,000;
the proportion of component (C) being from 2 to 15 parts by weight based on 100 parts by weight of the curable resin component; and
when the intermediate coating composition is applied to an undercoating film, pre-dried at 100°
C. for 30 minutes and then heat-cured at 145°
C. for 30 minutes, the film thickness shrinkage percentage of the cured coating film being 20% or less based on the film thickness of the coating film after pre-drying.
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Abstract
The present invention provides an aqueous intermediate coating composition comprising:
- (A) a resin containing hydroxyl and carboxyl groups with a hydroxyl value of 100 to 200 mg KOH/g and an acid value of 20 to 50 mg KOH/g;
- (B) at least one curing agent selected from the group consisting of melamine resins and blocked polyisocyanate compounds; and
- (C) flat pigment particles;
- the molecular weight distribution of a curable resin component comprising component (A) and component (B) including from 30 to 50% by weight of a component with a molecular weight of less than 1,000, and 10% by weight or less of a component with a molecular weight exceeding 100,000;
- the proportion of component (C) being from 2 to 15 parts by weight based on 100 parts by weight of the resin component; and
- when the intermediate coating composition is applied to an undercoating film, pre-dried at 100° C. for 30 minutes and then heat-cured at 145° C. for 30 minutes, the film thickness shrinkage percentage of the cured coating film being 20% or less based on the film thickness of the coating film after pre-drying.
The invention also provides a method for forming a multilayer coating film using the aqueous intermediate coating composition.
7 Citations
13 Claims
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1. An aqueous intermediate coating composition comprising:
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(A) a resin containing hydroxyl and carboxyl groups with a hydroxyl value of 100 to 200 mg KOH/g and an acid value of 20 to 50 mg KOH/g; (B) at least one curing agent selected from the group consisting of melamine resins and blocked polyisocyanate compounds; and (C) flat pigment particles; the molecular weight distribution of a curable resin component comprising component (A) and component (B) including from 30 to 50% by weight of a component with a molecular weight of less than 1,000, and 10% by weight or less of a component with a molecular weight exceeding 100,000; the proportion of component (C) being from 2 to 15 parts by weight based on 100 parts by weight of the curable resin component; and when the intermediate coating composition is applied to an undercoating film, pre-dried at 100°
C. for 30 minutes and then heat-cured at 145°
C. for 30 minutes, the film thickness shrinkage percentage of the cured coating film being 20% or less based on the film thickness of the coating film after pre-drying. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification