Patent GB-951428-A (GB)
Title: Adhesive compositions
Inventor: HART DONALD PETER
IPC: C09J131/04
Filed: 1962-02-06
Abstract: Pressure-sensitive adhesive compositions comprise a solution polymerized interpolymer comprising 40 to 85% by weight of at least one alkyl acrylate having at least 4 carbon atoms in the alkyl group and 60 to 15% by weight of at least one vinyl ester of an alkanoic acid containing 2 to 6 carbon atoms, said polymer having a viscosity of at least 2000 centipoises as a 50% solution in isopropyl acetate, in solution in a solvent.  Specified monomers are butyl, 2-ethylhexyl, octyl, nonyl, decyl, undecyl, dodecyl, tridecyl and tetradecyl acrylates and the vinyl esters of acetic, propionic, butanoic and pentanoic acids.  Polymerization may be effected in the presence of catalysts, e.g. benzoyl peroxide, t-butyl hydroperoxide, cumene hydroperoxide, di t-butyl peroxide, dicumyl peroxide and azo-diisobutyronitrile. Specified solvents are esters, aliphatic and cycloaliphatic hydro-carbons, ketones and alcohols.  Examples describe the preparation of solutions of copolymers of 2-ethylhexyl acrylate and vinyl acetate in (I and VIII) isopropyl acetate and isopropyl alcohol, (II) aliphatic hydrocarbons, acetone, ethyl alcohol and isopropyl alcohol, and (III) aliphatic hydrocarbons, ethyl alcohol and isopropyl alcohol; copolymers of 2-ethylhexyl acrylate and vinyl propionate in (IV and VII) isopropyl acetate; copolymers of n-octyl acrylate and vinyl acetate in (V) ethyl acetate and isopropyl alcohol; and copolymers of 2-ethylhexyl acrylate, butyl acrylate and vinyl acetate in (VI) isopropyl acetate.  The compositions may be applied to backings, e.g. fibrous backings such as cotton cloth and paper and particularly non-fibrous backings such as films or sheets of regenerated cellulose, linear terephthalic acid polyesters, neoprene and polyvinyl chloride, and also to hardboard, plastics and metals.ALSO:Fibrous and non-fibrous substrates, e.g. cotton cloth, and regenerated cellulose, linear terephthalic acid polyester, neoprene and polyvinyl chloride films, are coated with pressure-sensitive adhesive compositions comprising solutions of solution polymerized interpolymers of 40-85% by weight of at least one alkyl acrylate having at least 4 carbon atoms in the alkyl group and 60-15% by weight of at least one vinyl ester of an alkanoic acid containing 2 to 6 carbon atoms, said polymers having a viscosity of at least 2000 centipoises as a 50% solution in isopropyl acetate. Specified acrylates are butyl, 2-ethylhexyl, octyl nonyl, decyl, undecyl, dodecyl, tridecyl and tetradecyl acrylates, and specified vinyl esters are the vinyl esters of acetic, propionic, butanoic and pentanoic acids.  The compositions may be applied by roll coating, spraying, drawing or by doctor blade.  Examples describe the coating of polyvinyl chloride film with compositions comprising (I and VIII) copolymers of 2-ethylhexyl acrylate and vinyl acetate in isopropyl acetate and isopropyl alcohol, (IV and VII) copolymers of 2-ethylhexyl acrylate and vinyl propionate in isopropyl acetate, (V) a copolymer of n-octyl acrylate and vinyl acetate in ethyl acetate and isopropyl alcohol, and (VI) a copolymer of 2-ethylhexyl acrylate, butyl acrylate and vinyl acetate in isopropyl acetate.