A process for reducing the heat-seal temperature requirements of films and coatings produced from high vinylidene chloride polymer latexes comprising having present in films or coatings formed from such latexes, prior to fusion thereof, from about 0.5 to about 5 percent by weight of latex polymer solids of a polyoxyethylene sorbitan fatty acid monoester containing from about 10 to 20 moles of ethylene oxide and wherein said fatty acid contains from about 12 to 18 carbon atoms.
New vinylidene chloride copolymer latexes have been prepared with a hydroxyalkyl ester comonomer and acrylamido-2-methylpropane sulfonic acid. These products can be used to coat unprimed polyolefin film and yield laminates having dynamic peel strengths as high as 2400 g/in, that is equivalent to or greater than the peel strength of laminated uncoated polyethylene film itself.
The invention provides vinylidene halide copolymer latices comprises of (A) vinylidene halide as the principle copolymerized comonomer; (B) from about 0.2 to about 5 percent by weight of an ethylenically unsaturated sulfated monomer represented by the structural formula: ##STR1## wherein R is hydrogen or alkyl, R' is a hydrocarbylene group, N is a positive integer and M is a cation; (C) from about 0.5 to about 25 percent by weight of a hydroxyalkyl ester of an alpha, beta-ethylenically unsaturated carboxylic acid; and up to 40 percent by weight of an ethylenically unsaturated monomer other than comonomers (A)-(C). The latices coating attributes may be selectively altered for a desired end-usage by varying the copolymer composition. Latices which may be converted to vinylidene chloride coatings of superior anti-blocking and/or oxygen barrier resistance are provided.
Improved autodeposited coatings on metallic surfaces are formed by contacting the metallic surfaces with an autodepositing composition comprising an acidic aqueous coating solution containing dispersed solid resin particles of either an internally stablilized or externally stabilized vinylidene chloride polymer, an exemplary internally stabilized polymer being prepared from vinylidene chloride and a monomeric surfactant which includes an inorganic ionizable group, and an exemplary externally stabilized polymer being prepared from vinylidene chloride and a reactive comonomer, the resulting resin particles having surfactant adsorbed thereon, said autodeposited coatings having extremely good corrosion resistant properties without treatment with a reaction rinse such as a chromium rinse.
The invention relates to a method of using aqueous polymer dispersions based on acrylate-methacrylate copolymers as lamination adhesives for heat sealed glossy films, where the aqueous polymer dispersions have a solids content of from 20 to 65% by weight, the copolymer has a glass transition temperature of from -35.degree. to -10.degree. C., a K value of from 40 to 100 and a mean particle size of less than 200 nm, and the copolymer is obtainable by free-radical emulsion polymerization of: a) from 50 to 80 parts by weight of one or more comonomers from the group consisting of alkyl acrylates of alcohols having 2 to 10 carbon atoms, b) from 10 to 25 parts by weight of one or more comonomers from the group consisting of alkyl methacrylates of alcohols having 1 to 10 carbon atoms, and c1) from 0 to 10 parts by weight of one or more vinyl-aromatic comonomers, c2) from 0.1 to 4.0 parts by weight of one or more .alpha.,.beta.-unsaturated, monoolefinic carboxylic acids, c3) from 0 to 4.0 parts by weight of one or more .alpha..beta.-unsaturated, monoolefinic carboxamides, c4) from 0 to 8 parts by weight of one or more comonomers from the group consisting of hydroxyalkyl (meth)acrylates made from esters of acrylic acid or methacrylic acid and diols having 2 to 10 carbon atoms, and c5) from 0.1 to 4.0 parts by weight of one or more .alpha..beta.-unsaturated, monoolefinic compounds containing sulfonyl or sulfonate groups.
Improved autodeposited coatings on metallic surfaces are formed by contacting the metallic surfaces with an autodepositing composition comprising an acidic aqueous coating solution containing dispersed solid resin particles of either an internally stabilized or externally stabilized vinylidene chloride polymer, an exemplary internally stabilized polymer being prepared from vinylidene chloride and a monomeric surfactant which includes an inorganic ionizable group, and an exemplary externally stabilized polymer being prepared from vinylidene chloride and a reactive comonomer, the resulting resin particles having surfactant adsorbed thereon, said autodeposited coatings having extremely good corrosion resistant properties without treatment with a reaction rinse such as a chromium rinse.
