Patent GB-1065032-A (GB)
Title: Curing reactive polymers
IPC: C08K3/24
Filed: 1964-06-02
Abstract: Heat - curable thermosetting compositions comprise (1) a polymeric component containing, in the same or different molecules, (a) units of at least one ester of an a ,b -monoethylenically unsaturated carboxylic acid and (b) units containing an alcoholic hydroxyl group at least 2 carbon atoms removed from any ester linkage and (2) magnesium perchlorate and/or zinc perchlorate. Where polymeric component (1) is a single substance, the hydroxy groups may be present in the ester units or in separate units. Such polymers may be derived from esters of a  - hydroxyalkyl - a ,b  - monoethylenically unsaturated carboxylic acids, hydroxyalkyl esters or amides of a ,b -monoethylenically unsaturated carboxylic acids, hydroxyalkyl vinyl ethers or sulphides, and related compounds wherein the alkyl moiety of the hydroxyalkyl groups is replaced by the group -CxH2x(ACxH2x)m-in which A is 0 or S, x is 2 or 3 and m is a whole number, e.g. from 1 to 10.  Also, hydroxyl groups can be introduced by after-treatment. Where the ester and hydroxy groups are in separate units, the former may be derived from acrylic or methacrylic acid esters of alcohols having up to 18 carbon atoms, e.g. alkanols, cyclohexanol, benzyl alcohol and alkyl-substituted cyclohexanols and benzyl alcohols, or esters of maleic, itaconic, aconitic, fumaric and citraconic acids.  The polymer(s) may consist entirely of hydroxy- and ester-containing units, but other units may also be present, e.g. of acrylonitrile, methacrylonitrile, vinyl esters such as vinyl acetate, vinyl chloride, vinylidene chloride and vinyl aromatic compounds such as styrene and vinyl toluene, acrylic acid, methacrylic acid, itaconic acid, acrylamide or methacrylamide. The compositions are suitable for moulding and for coating a wide variety of substrates (see Division B2) and, in the latter case, are generally applied in the form of an organic solvent solution or an aqueous dispersion, followed by drying and curing at elevated temperatures. Pigments, dyes, and moulding lubricants and release agents may be included. Suitable pigments include chrome yellow, Prussian blue, Brunswick green, titanium compounds, which may be extended with alkali earth sulphates, zinc sulphides, zinc oxide, antimony oxide and organic pigments or dyes.  The following copolymers are used in the examples: (i) methyl methacrylate-ethyl acrylate-b -hydroxyethyl methacrylate; (ii) styrene-b -hydroxyethyl methacrylate; (iii) n-butyl acrylate-b -hydroxyethyl methacrylate; (iv) styrene-methyl methacrylate-ethyl acrylate-b -hydroxy-n-propyl methacrylate-methacrylic acid; (v) styrene-methyl methacrylate-ethyl acrylate-b -hydroxy ethyl methacrylate-methacrylic acid and (vi) styrene-ethyl acrylate-b -hydroxy-n-propyl methacrylate-methacrylic acid.ALSO:Heat-curable thermosetting compositions suitable for coating a wide variety of substrates comprise, in solution in an organic solvent or in aqueous dispersion, (i) a polymeric component containing, in the same or different molecules, (a) units of at least one ester of an a ,b -monoethylenically unsaturated carboxylic acid and (b) units containing an alcoholic hydroxyl group at least 2 carbon atoms removed from any ester linkage and (2) magnesium perchlorate and/or zinc perchlorate.  In the Examples, the polymeric components are copolymers of b -hydroxy ethyl or b -hydroxy propyl methacrylate.  (For further details of the polymeric component see Division C3).  Pigments may be included in the compositions, e.g. chrome yellow, Prussian blue, Brunswick green, titanium compounds, which may be extended with alkali earth sulphates, zinc sulphides, zinc oxide, antimony oxide and organic pigments or dyes.  Substrates which may be coated include paper, textiles, leather, wood ceramics, brick, p  stone, concrete and metals, e.g. in automobiles, tin cans, cannisters, stoves and refrigerators.  Curing of the coatings may be effected at temperatures from 200 DEG  to 450 DEG F.  In examples, the coatings are applied, e.g. by spreading, spraying or roller coating, to cold-rolled, phosphatized or tin-plated steel.