TRANSPARENT MOLDING COMPOSITIONS COMPRISING METHACRYLATE POLYMERS BLENDED WITH A MINOR AMOUNT OF POLY(VINYLIDENE FLUORIDE)

摘要

A composition comprises a blend of (A) from 25 to 99% by weight of a polymer of methylmethacrylate composed of (1) methyl methacrylate, and (2) from 0 to 30% by weight based on the weight of (A) of at least one non-carboxyl-containing monomer which is copolymerizable with the methyl methacrylate; and substantially homogeneously dispersed therewith, (B) from 1 to 75% by weight of poly(vinylidene fluoride), said percentages of (A) and (B) being based upon the total weight of (A) plus (B). The polyvinylidene fluoride may contain up to 5% by weight of a second comonomer. Exemplified non - carboxyl containing monomers are styrene, acrylonitrile and ethyl acrylate. The copolymer may also contain up to 10% by weight of at least one monomer containing carboxyl groups, those exemplified being acrylic acid, methacrylic acid, itaconic acid, maleic acid, vinyl sulfonic acid, vinyl benzoic acid and fumaric acid. The compositions are utilized for coatings (see Division B2) and laminates (see Division B5).ALSO:Metals e.g. aluminium, stainless steel, carbon steel, aluminium killed carbon steel, aluminium coated carbon steel, zinc coated carbon steel, galvanized carbon steel, bronze, copper or brass are coated with a composition comprising (A) poly(vinylidenefluoride) and (B) a copolymer of methyl methacrylate with a comonomer containing non polymerizable acid groups (see Division C3). The compositions may be coated directly onto the metal or diluted with a solvent. The coatings are cured by heating from 50 DEG C to 200 DEG C for from 30 mins to 3 hours.