Patent GB-785175-A (GB)
Title: Process for the production of elastic coatings
IPC: B05D7/26
Filed: 1956-01-23
Abstract: A method of producing elastic coatings on surfaces comprises applying to the surfaces a polymer emulsion, prepared by emulsion polymerization at a pH higher than 7, of (1) ethylenically unsaturated compounds with an elasticizing action and containing no free acid groups, e.g. butyl, dodecyl and octadecyl acrylates and methacrylates, vinyl isobutyl ether, vinyl butyl ether, butadiene, isoprene, 2,3-dimethyl butadiene and b -chloro-butadiene; (2) other ethylenically unsaturated compounds containing no free acid groups, e.g. styrene, divinyl benzene, acrylonitrile, methacrylonitrile and acrylic and methacrylic esters of alcohols with 1-3 carbon atoms; and (3) semi-esters of a ,b -ethylene dicarboxylic acids with alcohols containing at least 8 carbon atoms in aliphatic or cycloaliphatic bond, or salts of these semi-esters, e.g. maleic and fumaric semi-esters with octyl, dodecyl, octadecyl, abietic and hydroabietic alcohols.  Stabilizers, e.g. phenyl-b -naphthylamine, 2,6 - di - tert. - butyl - p - cresol and the product obtained by polymerizing styrene in the presence of diphenylamine, vulcanizing ingredients, e.g. sulphur, zinc oxide and zinc diethyl dithiocarbamate, fillers and pigments, e.g. kaolin and kieselguhr, dyes and casein may be added to the emulsion which may be used to form sealing layers on packings and sealing rings for preserve jars.  In Example (4) an emulsion is applied to the rim of a tin lid by means of a nozzle and dried to form an annular film.  The rim is folded on to the tin and the film vulcanized by boiling the tin in water.  Specification 763,396 is referred to.ALSO:Terpolymers of (1) ethylenically unsaturated compounds with an elasticizing action and containing no free acid groups; (2) other ethylenically unsaturated compounds containing no free acid groups; and (3) semi-esters of a ,b -ethylene dicarboxylic acids with alcohols containing at least 8 carbon atoms in aliphatic or cycloaliphatic bond, or salts of these semi-esters, are prepared by emulsion polymerization at a pH value higher than 7. (1) may be acrylic and methacrylic esters of alcohols having at least 4 carbon atoms, e.g. butyl, dodecyl and octadecyl alcohols, vinyl alkyl ethers in which the alkyl group contains at least 4 carbon atoms, e.g. vinyl isobutyl ether and vinyl butyl ether, and conjugated dienes, e.g. butadiene, isoprene, 2,3-dimethyl butadiene and b -chlorobutadiene.  (2) may be styrene, divinyl benzene, acrylonitrile, methacrylonitrile and acrylic and methacrylic esters of alcohols with 1-3 carbon atoms; (3) may be semi-esters of maleic and fumaric acids with octyl, dodecyl, octadecyl, abietic and hydroabietic alcohols.  Catalysts, e.g. peroxides, potassium persulphate and redox systems containing sulphinic acid, ascorbic acid, sugar, amines, salts of polyvalent metals and mercaptans, emulsifiers, e.g. soaps and alkyl aryl sulphonates, and regulators, e.g. dodecyl mercaptan, may be present.  Stabilizers, e.g. phenyl - b - naphthylamine, 2,6 - di - tert. - butyl - p - cresol and the product obtained by polymerizing styrene in the presence of diphenylamine, vulcanizing agents and accelerators, e.g. sulphur, zinc oxide and zinc diethyl dithiocarbamate, fillers and pigments, e.g. kaolin and kieselguhr, dyes and casein may be added to the emulsion which may be used to form elastic coatings, e.g. sealing layers on packings and sealing rings for preserve jars and cans. Examples describe the preparation of polymers of (1) abietyl acid maleate, acrylonitrile and butadiene, (2) abietyl acid maleate, styrene, acrylonitrile and butadiene; (3) dodecyl acid maleate, styrene, acrylonitrile and butadiene; and (4) hydroabietyl acid maleate acrylonitrile, styrene and butadiene.  Specification 763,396 is referred to.