GB1098916A - Print pastes for printing materials having a smooth surface - Google Patents

Abstract

A print paste contains as the binder and as the colouring agent a film-forming copolymer of: (a) at least one dye which bears a polymerisable group; (b) at least one ester of a polymerizable carboxylic acid; and (c) at least one polymerizable hydrocarbon. At least one other comonomer may be included. Component (a) may be replaced by (c) at least one comonomer having a reactive group and (f) at least one dye having a group complementary to the reactive group in (e). Suitable dyes (a) include particularly those of the azo and anthraquinone series, but may also include, for example triphenylmethane dyes. The polymerizable groups are preferably acrylic, acryloylamino, acryloyloxyalkyl, acryloyloxyaryl and vinyl groups. In Example I a coloured copolymer I is prepared by copolymerization of a dye of formula <FORM:1098916/C3/1> methyl methacrylate, styrene and the butyl ether of methylolmethacrylamide in methyl ethyl ketone with azodiisobutyronitrile as catalyst. Copolymer II is prepared by solution polymerization of vinyl chloride, vinyl acetate and acrylic acid under the same conditions. A print paste is then prepared by dissolving copolymers I and II in methyl ethyl ketone. In Example II a dye of formula <FORM:1098916/C3/2> acrylonitrile, methyl methacrylate, ethyl acrylate, styrene and itaconic acid are copolymerized in M.E.K. in the presence of azodiisobutyronitrile and a print paste prepared by dissolving this in M.E.K.ALSO:A print paste contains as binder and colouring agent a film forming copolymer of (a) at least one dye which bears a polymerisable group; (b) at least one ester of a polymerisable carboxylic acid and (c) at least one polymerisable hydrocarbon. At least one other comonomer may be included. Component (a) may be replaced by (e) at least one comonomer having a reactive group and (b) at least on dye having a group complementary to the reactive group in (e). Suitable dyes are those of the azo and anthraquinone series and triphenylmethane dyes. The pastes are suitable for printing smooth materials particularly foils, films and sheets of plastics or aluminium. In Example 1 a gravure printing machine is used to print on unlacquered polyethylene film and polyvinyl chloride film.ALSO:A print paste contains as binder and colouring agent a film forming copolymer of (a) at least one dye which bears a polymerisable group; (b) at least one ester of a polymerisable carboxylic acid and (c) at least one polymerisable hydrocarbon. At least one other comonomer may be included. Component (a) may be replaced by (e) at least one comonomer having a reactive group and (f) at least one dye having a group complementary to the reactive group in (e). Suitable dyes are those of the azo and anthraquinone series and triphenyl methane dyes. The pastes are suitable for printing smooth materials particularly foils, films and sheets of plastics or aluminium. In Example 1 a gravure printing machine is used to print on unlacquered aluminium foil, polyethylene film and polyvinyl chloride film.