Patent GB-918734-A (GB)
Title: Copolymers and aqueous compositions thereof
IPC: D06M15/285
Filed: 1959-04-14
Abstract: Surfaces, e.g. of metals, stone, cement, concrete, bricks, plastics, asbestos cement shingles and cinder blocks, may be coated with aqueous dispersions of water-insoluble linear addition copolymers of monomer mixtures containing (1) 15 to 35 weight per cent of acrylonitrile or methacrylonitrile, (2) 1 to 5 weight per cent of acrylamide or methacrylamide and (3) 84 to 60 weight per cent of a mixture of ethyl acrylate with at least one acrylic ester of an alkanol containing 3 to 8 carbon atoms, the proportion of ethyl acrylate being 25 to 75 weight per cent of the ester component.  The compositions may also comprise pigments, e.g. azo pigments, phthalocyanine pigments, vat dyestuffs, carbon black, iron oxides, chrome yellows, titanium dioxide, lithopone and powdered or flaked metals such as aluminium, bronze, brass, chromium or gold; thickeners, e.g. gum tragacanth, cellulose ethers, polyvinyl alcohol or partially saponified polyvinyl acetate; mild alkali, e.g. sodium acetate, sodium carbonate, chalk, ammonia or morpholine; and where thermosetting coatings are desired an aminotriazine-formaldehyde condensate and an acid or latent acid catalyst, e.g. pentamethylol or hexamethylol melamine or the methylation products thereof and an ammonium or amine salt.  The compositions may be applied by spraying, brushing, roller-coating, dipping or knife-coating and excess material removed by pressure rollers, air squeegeeing, a knife or doctor blade.  The coating may be air dried, or dried by heating, infra red irradiation or electrical induction.  In Example 1 an aqueous dispersion of an acrylonitrile, acrylamide, ethyl acrylate propyl acrylate copolymer containing a t-octylphenolethylene oxide condensate as dispersing agent is sprayed on to asbestos cement shingles which are dried at 140 DEG C.  Specification 886,190 is referred to.ALSO:Water-insoluble linear addition copolymers of monomer mixtures containing (1) 15 to 35% by weight of a nitrile of acrylic or methacrylic acid, (2) 1 to 5% by weight of an amide of acrylic or methacrylic acid and (3) 84 to 60% by weight of a mixture of acrylic acid esters comprising ethyl acrylate and at least one acrylic ester of an alkanol containing 3 to 8 carbon atoms, the proportion of ethyl acrylate being 25 to 75% by weight of the ester component, may be prepared by aqueous emulsion polymerization of the monomer mixture in the presence of a free radical polymerization initiator.  The dispersions may be used as coating compositions, optionally after the incorporation of pigments, e.g. azo pigments and lakes, phthalocyanine pigments, vat dyestuffs, carbon black, iron oxides, chrome yellows, titanium dioxide, lithopone and powdered or flaked aluminium, bronze, brass, chromium or gold; thickeners, e.g. gum tragacanth, cellulose ethers, polyvinyl alcohol or partially saponified polyvinyl acetate; mild alkali, e.g. sodium acetate, sodium carbonate, chalk, ammonia or morpholine; and where thermosetting coatings are desired an aminotriazine-formaldehyde condensate and an acid or latent acid catalyst, e.g. pentamethylol or hexamethylol melamine or the methylation products thereof and an ammonium or amine salt.  The compositions may be used for coating paper, leather, textiles, metals, stone, cement, concrete, bricks and cinder blocks.  Examples describe (1) the preparation of an acrylonitrile, acrylamide, ethyl acrylate, propyl acrylate copolymer in the presence of ammonium persulphate, sodium hydrosulphite and a t-octylphenol-ethylene oxide condensate and the preparation of aqueous compositions comprising hexamethylol melamine, copper phthalocyanine, ammonia, t-octylphenol-ethylene oxide condensate, sodium alginate, the hydrochloride of 2-methyl-2-amino-propanol-1 and (2) an acrylonitrile, methacrylamide, ethyl acrylate, butyl acrylate copolymer and (3) an acrylonitrile, methacrylamide, ethyl acrylate, 2-ethylhexyl acrylate copolymer.  Specification 886,190 is referred to.ALSO:Pigment-printing and pigment-dyeing compositions comprise a water-insoluble, linear addition copolymer of monomer mixtures containing (1) 15 to 35 weight per cent of acrylonitrile or methacrylonitrile, (2) 1 to 5 weight per cent of acrylamide or methacryamide and (3) 84 to 60 weight per cent of a mixture of ethyl acrylate and at least one acrylic ester of an alkanol containing 3 to 8 carbon atoms, the proportion of ethyl acrylate being 25 to 75 weight per cent of the ester component.  The compositions may also comprise pigments and dyestuffs; thickeners, e.g. gum tragacanth, cellulose ethers, polyvinyl alcohol and partially saponified polyvinyl acetate; mild alkali, e.g. sodium acetate, sodium carbonate, chalk, ammonia or morpholine; and where thermosetting coatings are desired an aminotriazine-formaldehyde condensate and an acid or latent acid catalyst, e.g. pentamethylol or hexamethylol melamine or the methylation products thereof and an ammonium or amine salt. Examples describe the treatment of cotton sheeting with compositions comprising aqueous dispersions comprising hexamethylol melamine, copper phthalocyanine, ammonia, a t-octyl phenolethylene oxide condensate, sodium alginate, the hydrochloride of 2-methyl-2-aminopropanol-1 and (2) a copolymer of acrylonitrile, methacrylamide, ethyl acrylate and butyl acrylate, and (3) a copolymer of acrylonitrile, methacrylamide, ethyl acrylate and 2-ethyl-hexy acrylate.  Specification 886,190 is referred to.