Invention Grant
US08647745B2 Powder coating compositions having a substantially non-zinc containing primer 有权
具有基本上不含锌的底漆的粉末涂料组合物

Powder coating compositions having a substantially non-zinc containing primer
Abstract:
Corrosion and chip-resistant coatings for high tensile steel components, such as automotive coil springs, are formed from a coating composition comprising a substantially non-zinc containing primer and a topcoat. The primer includes an epoxy resin having an epoxy equivalent weight of about 860 to about 930, a polyhydroxyl functional phenolic curing agent having a hydroxyl equivalent weight of about 200 to about 500, and a filler material. The topcoat includes an epoxy resin having an epoxy equivalent weight of about 520 to about 930, an elastomer-modified epoxy resin having an epoxy equivalent weight of about 1000 to about 1600, a carboxyl functional polyester with an acid number of about 45 to about 75 mg KOH/g, a foaming agent and a reinforcing fiber.
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