Patent GB-1071344-A (GB)
Title: Improvements in or relating to vinyl chloride copolymers
IPC: C08F214/06
Filed: 1964-05-08
Abstract: Xylene-soluble copolymers of vinyl chloride may be prepared by copolymerizing vinyl chloride, an acrylic ester and vinyl acetate and/or an a ,b -unsaturated monocarboxylic acid, e.g. acrylic, methacrylic or crotonic acid, in the presence of 5 to 15 parts by weight of a non-polymeric organic chain terminator per 100 parts by weight of the resulting copolymer. Specified acrylates are methyl, ethyl, ethylhexyl, allyl, methallyl and ethallyl acrylates. Specified chain terminators are trichlorethylene, perchlorethylene, carbon tetrachloride, dodecyl mercaptan and mixtures of dodecyl mercaptan and trichlorethylene. Polymerization may be effected in aqueous emulsion or suspension, and the acrylic ester and acid or vinyl acetate may be added continuously or incrementally during polymerization to produce homogeneous copolymers.  Water - soluble and monomer-soluble initiators may be used, e.g. sodium persulphate, potassium persulphate, lauroyl peroxide, benzoyl peroxide, t.-butyl hydroperoxide and azobisisobutyronitrile.  Examples describe the copolymerization in aqueous suspension of vinyl chloride, vinyl acetate, acrylic acid and 2-ethylhexyl, methyl, ethyl and butyl acrylate in the presence of lauroyl peroxide, trichlorethylene and a vinyl methyl ether/maleic anhydride copolymer.  In further examples the trichlorethylene is replaced by perchlorethylene, carbon tetrachloride, dodecyl mercaptan and a mixture of dodecyl mercaptan and trichlorethylene; the initiator is replaced by benzoyl peroxide, t.-butyl hydroperoxide and azobisisobutyronitrile; the suspending agent by polyvinyl alcohol, methyl cellulose and gelatine; and the acrylate and acid by allyl acrylate and methacrylic acid.  The copolymers are soluble in toluene, xylene and mixtures thereof with acetone and methyl ethyl ketone, and the solutions may be used for coating metals, fabrics and paper.ALSO:Substrates such as metals, paper and fabrics may be coated with organic solvent solutions of xylene-soluble vinyl chloride copolymers prepared by copolymerising vinyl chloride, an acrylic ester and an a , b  unsaturated mono-carboxylic acid and/or vinyl acetate in the presence of 5 to 15 parts by weight of a non-polymeric organic chain terminator for the polymerisation per 100 parts by weight of the resulting copolymer. Specified acrylates are methyl, ethyl, ethylhexyl, allyl, methylallyl and ethylallyl acrylates.  Specified acids are acrylic, methacrylic and crotonic acids.  Specified chain terminators are trichloroethylene, perchloroethylene, dodecyl mercaptan and mixtures of trichloroethylene and dodecyl mercaptan.  In examples steel panels are dip coated with methyl ethyl ketone solutions of trichloroethylene terminated copolymers of vinyl chloride, vinyl acetate, acrylic acid and ethyl, methyl, butyl or 2-ethylhexyl acrylate; perchloroethylene, carbon tetrachloride and dodecyl mercaptan terminated copolymers of vinyl chloride, vinyl acetate, acrylic acid and 2-ethylhexyl acryate; trichloroethylene terminated copolymers of vinyl chloride, vinyl acetate and 2-ethylhexyl acrylate; and trichloroethylene terminated copolymers of vinyl chloride, vinyl acetate, methacrylic acid and allyl acrylate.