Patent GB-972919-A (GB)
Title: Coating compositions and cellulosic materials coated therewith
IPC: C09D125/14
Filed: 1961-09-21
Abstract: Coating compositions comprise an aqueous medium having dispersed therein an alkali stabilized colloidal silica and a finely divided copolymer derived by the copolymerization of (a) a monoethylenically unsaturated aromatic hydrocarbon or halohydrocarbon, (b) an alkyl ester of acrylic or methacrylic acid in which the alkyl group contains 1 to 20 carbon atoms and (c) an ethylenically unsaturated carboxylic acid or anhydride thereof, optionally with (d) an ethylenically unsaturated nitrile, the quantity of colloidal silica being 10 to 500 parts by weight per 100 parts by weight of copolymer. Specified aromatic compounds are styrene, a -methyl styrene, para-chlorostyrene, 2,4-dichlorostyrene, 2,5-dichlorostyrene, para-bromostyrene, para-methylstyrene, a -methyl-para-methylstyrene, meta-ethylstyrene, para-isopropylstyrene and vinyl naphthalene. Specified esters are those of amyl alcohol, hexanol, 2-ethyl-hexanol, octanol, 2-methyl pentanol, the oxo alcohol from isobutylene dimer, heptyl alcohol, 3-methyl heptyl alcohol, tridecyl alcohol and tetradecyl alcohol. Specified acids are acrylic, crotonic, isocrotonic, methacrylic, vinyl acetic, tiglic, angelic, maleic and fumaric acids and maleic anhydride, and partial esters of polycarboxylic acids, e.g. methyl, ethyl and propyl acid maleates, methyl and secondary butyl acid fumarates, methyl and butyl acid citraconates, ethyl and butyl acid chloromaleates and methyl and butyl acid itaconates. Specified nitriles are acrylonitrile and methacrylonitrile. Examples describe the preparation of compositions comprising copolymers of (I) styrene, octyl acrylate and methyl acid maleate and (VI) styrene, 2-ethylhexyl acrylate, methacrylic acid and acrylonitrile.  The compositions may be used for coating cellulosic sheet materials, e.g. paper cardboard, plywood and wood. Specifications 649,897, 662,423, 663,013 and 787,703 are referred to.ALSO:Cellulosic sheet materials, e.g. paper, cardboard and corrugated cardboard, may be coated with compositions comprising an aqueous medium having dispersed therein an alkali stabilized colloidal silica and a finely divided copolymer derived by the copolymerization of (a) a monoethylenically unsaturated aromatic hydrocarbon or halohydrocarbon, (b) an alkyl ester of acrylic or methacrylic acid in which the alkyl group contains 1-20 carbon atoms, and (c) an ethylenically unsaturated mono or polycarboxylic acid or an anhydride or partial ester of the latter, which is copolymerizable with (a) and (b), the quantity of silica being 10-500 parts by weight per 100 parts of copolymer.  The copolymer may also contain units of an ethylenically unsaturated nitrile. Specified aromatic compounds are styrene, a -methyl styrene, p-chlorostyrene, 2,4-dichlorostyrene, 2,5-dichlorostyrene, p-bromostyrene, p-methyl styrene, a -methyl-p-methyl styrene, m-ethyl styrene, p-isopropyl styrene and vinyl naphthalene. Specified esters are those of amyl alcohol, hexanol, 2-ethyl hexanol, octanol, 2-methyl pentanol, the oxo alcohol from isobutylene dimer, heptyl alcohol, 3-methyl heptyl alcohol, tridecyl alcohol and tetradecyl alcohol.  Specified acids are acrylic, crotonic, methacrylic, isocrotonic, vinyl acetic, tiglic, angelic, maleic and fumaric acids; maleic anhydride; methyl, ethyl and propyl acid maleates; methyl and sec. butyl acid fumarates; methyl and butyl acid citraconates; ethyl and butyl acid chloromaleates and methyl and butyl acid itaconates. Specified nitriles are acrylonitrile and methacrylonitrile. Examples describe the coating of (I, III, V, VIII and X) corrugated cardboard, and (II, IV, VII and IX) Kraft paper with aqueous dispersions of alkali stabilized colloidal silica and copolymers of styrene, octyl acrylate and methyl acid maleate; and of (VI and X) corrugated cardboard, (IX) Kraft paper and (XI) white Kraft and blue jute cardboards with aqueous dispersions of alkali stabilized colloidal silica and copolymers of styrene, 2-ethyl hexyl acrylate, methacrylic acid and acrylonitrile. Specifications 649,897, 662,423, 663,013 and 787,703 are referred to. p