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AQUEOUS INTERMEDIATE COATING COMPOSITION AND METHOD FOR FORMING MULTILAYER COATING FILM

  • US 20100221442A1
  • Filed: 01/23/2007
  • Published: 09/02/2010
  • Est. Priority Date: 01/23/2006
  • Status: Active Grant
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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