Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Reexamination Certificate
2007-01-23
2011-10-11
Sellers, Robert (Department: 1765)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
C427S385500, C427S388400, C427S409000, C525S162000
Reexamination Certificate
active
08034877
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; andwhen 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.
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Adachi Takato
Furusawa Satoru
Sato Shingo
Takahashi Terutaka
Kansai Paint Co. Ltd.
Kratz Quintos & Hanson, LLP
Sellers Robert
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