Coating composition with epoxy- polyester polymer

Coating processes – With post-treatment of coating or coating material – Heating or drying

Reexamination Certificate

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Details

C427S375000, C427S386000, C427S388200, C525S088000, C525S09200D, C525S09200D, C525S096000, C525S418000, C528S272000

Reexamination Certificate

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06994888

ABSTRACT:
A protective coating composition in an organic liquid carrier comprising a polymeric film forming binder, the polymeric binder comprising by weight:(a) 50% to 100% of an epoxy-polyester block copolymer being the reaction product of a preformed epoxy resin and a preformed carboxyl functional, and (b) 0 to 50% of a crosslinker where the sum of (a) and (b) is 100%,characterised in that the carboxyl functional polyester prepolymer is the reaction product of one or more polyols with one or more dicarboxylic acids or their anhydrides, where the dicarboxylic acids or anhydrides comprise a mixture of (i) 20% to 45% of an aromatic dicarboxylic acid or its anhydride, (ii) 55% to 80% of cyclohexane dicarboxylic acid, and (iii) 0 to 10% other aliphatic dicarboxylic acid, where the sum of (i), (ii), and (iii) is 100% based on the weight of the dicarboxylic acid and anhydride components.

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