C - Chemistry – Metallurgy – 09 – D
Patent
C - Chemistry, Metallurgy
09
D
C09D 133/14 (2006.01) B05D 3/00 (2006.01) B29C 35/02 (2006.01) C09D 133/02 (2006.01) C09D 133/06 (2006.01) C09D 161/28 (2006.01)
Patent
CA 2611426
The present invention relates to a first clear coating composition comprising (a) an acryl resin having a hydroxyl value of 110 to 160 mgKOH/g and an acid value of 5 to 35 mgKOH/g, which is obtainable by a polymerization of (1) an acryl monomer having an alkyl ester group having at least 8 carbon atoms, (2) an acryl monomer having a hydroxyl group wherein at least 4 carbon atoms are placed between the hydroxyl group and the acryl group therein, (3) an acryl monomer having a carboxyl group, and (4) other acryl monomer, wherein content of the acryl monomer (1) having an alkyl ester group having at least 8 carbon atoms is 5 to 20% by weight relative to total monomer weight; (b) an acryl resin having a hydroxyl value of 10 to 150 mgKOH/g and an epoxy equivalent of 230 to 800 g/eq, which is obtainable by a polymerization of (5) an acryl monomer having a hydroxyl group, (6) an acryl monomer having an epoxy group, and (7) other acryl monomer; and (c) a curing agent of a melamine resin, which has a solubility parameter (SP value) within a range of from 9.5 to 11.0, and which comprises no less than 50% by weight of an imino group-containing melamine resin. The present invention is effective in a three coating and two baking (3C2B) coating process which includes applying a base coating composition, applying a first clear coating composition thereon by a wet-on-wet procedure, curing the coatings, applying a second clear coating composition thereon, and then curing the coating, in order to prevent disturbance of the resulting first clear coating film on the resulting base coating film and improve adhesion of the second clear coating composition to the resulting first clear coating film.
Segawa Daisuke
Sugimoto Katsuhiko
Kirby Eades Gale Baker
Nippon Paint Co. Ltd.
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