Powder coating materials
AssigneeBritish Industrial Plastics Limited
InventorsPhilip Michael Cadman, Brian York Downing
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Abstract
A powder coating material comprises a copolymer of an ethylenically unsaturated ester and from 11% by weight to 15% by weight (based on the weight of the copolymer) of an .alpha., .beta.-unsaturated carboxylic acid, cross-linked with a di- or polyepoxide resin.
Claims7
A powder coating material, consisting essentially of (i) a terpolymer of a mixture of ethylenically unsaturated esters and an .alpha.,.beta.-unsaturated carboxylic acid and (ii) a polyepoxide resin cross-linking agent, characterized in that the .alpha.,.beta.-unsaturated carboxylic acid is present in an amount of from 11% by weight to 15% by weight of the terpolymer.
In a powder coating composition which consists essentially of (i) a terpolymer of a mixture of ethylenically unsaturated esters and an .alpha.,.beta.-unsaturated carboxylic acid and (ii) a polyepoxide resin cross-linking agent, the improvement consisting essentially of providing in said composition from 11% to 15% by weight, based on the copolymer, of said .alpha.,.beta.-unsaturated carboxylic acid, whereby the aggregate physical and mechanical properties of coatings produced therefrom are improved over the aggregate of said properties for a coating produced from a similar composition containing not more than 10% by weight, based on the copolymer, of said unsaturated acid.
Dependencies are inferred from the claim text.