Coating compositions

摘要

A wax coating composition comprises (a) a petroleum wax, (b) an interpolymer containing 77-85% (wt.) ethylene and 23-15% vinyl acetate or 70-80% ethylene and 30-20% ethyl acrylate and (c) a graft copolymer of a dicarboxylic acid or anhydride and polyethylene, the proportions (a), (b) and (c) being such that the composition has a seal strength when applied to glassine of at least 75 gm. per inch; such proportions are preferably (a) 47.5-82.5%, (b) 10-40%, (c) 5-15%. The petroleum wax is preferably paraffin and/or microcrystalline wax, particularly the mixture. The grafting acid of (c) may be maleic or fumaric acid. The composition may contain 10-500 p.p.m. of a phenolic antioxidant such as 2,6-di-tertiarybutyl-p-cresol or the mixture 2-tertiarybutyl - 4 - hydroxyanisole + 3 - tertiary-butyl-4-hydroxyanisole, and other additives such as polyethylene, polyisobutylene, butyl rubber, the slip agent 9-octadecenamide, polyterpenes or pentaerythritol esters of rosin.ALSO:A wax coating composition comprises (a) a petroleum wax; (b) an interpolymer containing 77-85% (weight) ethylene and 23-15% vinyl acetate or 70-80% ethylene and 30-20% ethyl acrylate; and (c) a graft copolymer of a dicarboxylic acid or anhydride and polyethylene, the proportions (a), (b) and (c) being such that the composition has a seal strength when applied to glassine of at least 75 gm. per inch; such proportions are preferably (a) 47.5-82.5%; (b) 10-40%; (c) 5-15%. The petroleum wax is preferably paraffin and/or microcrystalline wax. The dicarboxylic acid constituent of (c) may be maleic or fumaric acid. The composition may contain 10-500 p.p.m. of an antioxidant 2,6-di-tertiarybutyl-p-cresol or the mixture 2- and 3-tertiarybutyl-4-hydroxyanisole, and other additives such as polyethylene, polyisobutylene, butyl rubber, the slip agent 9-octadecenamide, polyterpenes or pentaerythritol esters of rosin.