Coating processes – Centrifugal force utilized – Metal coating
Patent
1995-06-19
2000-03-21
Short, Patricia A.
Coating processes
Centrifugal force utilized
Metal coating
427240, 4273855, 4273882, 4273883, 523400, 524539, 524542, 524597, 525437, 525440, 525443, 525450, 525519, 528 80, 528 81, 528297, 528354, C09B16700, C09B16704
Patent
active
060400099
ABSTRACT:
The present invention is to provide a low solvent content type-coating composition by which the resultant coatings with good scuff resistance or water resistance as well as good chipping resistance are produced, while the content of an organic solvent to be used can be much reduced. The low solvent content type-coating composition comprises a polyester oligomer having a hydroxyl group in an amount of 2.0 to 10.0 moles/Kg-resin, a number average molecular weight (Mn) of 300 to 1500, a weight average molecular weight (Mw) of 300 to 3000, and a ratio of a weight average molecular weight/a number average molecular weight (Mw/Mn) of 1 to 2.0, an amount of a modifying lactone being 31 to 85%, and an aliphatic hydrocarbon group of C4-22 which is not derived from lactones. The present invention is also to provide a process for coating a low solvent content type-coating composition on, for example, a base coating composition by a wet-on-wet coating. The base coating composition comprises a vinyl oligomer having a hydroxyl group and/or a blocked hydroxyl group, a melamine resin containing 50 to 100% of an imino type or methylol type mononucleus melamine and a weak acidic curing catalyst.
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Koga Kazuhi
Marutani Yoshiaki
Nakahama Tadamitsu
Ohsawa Mika
Tomita Takashi
Fleit Martin
Mazda Motor Corporation
Short Patricia A.
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