GB549303A - Improvements in or relating to the manufacture of oil-soluble polystyrene resinous products - Google Patents

Abstract

549,303. Polystyrene resinous products. BAKELITE, Ltd. May 12, 1941, No. 6140. Convention date, May 15, 1940. [Class 2 (iii)] Oil-soluble polystyrene resinous products suitable for use in varnishes, moulding compositions, laminated articles, brake linings and for insulating purposes are obtained by polymerizing a mixture of styrene and an oil-soluble phenolic resin. prepared from an alkyl or aryl substituted phenol. Catalysts which may be used comprise benzoyl peroxide and boron compounds such as the halides ; the latter may be used together with a dicarboxylic acid, particularly acids having hydroxy and carboxylic groups attached to the same or adjacent carbon atoms e.g. oxalic, tartaric, lactic, salicylic acids. The polymerization can be carried out in the presence of an inert solvent e.g. toluol, xylol and naphtha, and mixtures of oilsoluble phenolic resins may be used, whilst additional natural or synthetic resins may also be incorporated. Inhibitors e.g. sulphur, tertbutyl phenol, hydroquinone, catechol, resorcinol, and methoxy compounds such as guaiacol may be present during the polymerization but must be removed before making the product into a varnish. Crude styrene may be used and the reaction can be carried out in the presence of drying or semi-drying oils, e.g. tung, oiticica, linseed, perilla and soya. Oils containing double bonds, e.g. tung, oiticica, must not exceed 25 per cent. of the mass. In examples resinous products from which varnishes could be obtained by heating with china wood oil and mineral spirits, were produced from styrene and (1) pphenylphenol-formaldehyde resin, oxalic and boric acids ; (3) a resin made from tert-butyl phenol or p-phenylphenol and formaldehyde, china wood oil, oxalic and boric acids ; (4) the resin of (3), rosin or rosin-glycerol ester, triamyl borate and salicylic acid. The varnish of Ex. 3 is compatible with ethyl cellulose and chlorinated rubbers to form quick-drying lacquers. In example (5) a crude styrene mixture, 50 per cent. in xylene, was used together with the materials specified in (1) above. Fillers, e.g. .asbestos, ground cork and pigments such as titanium dioxide may be included in the reaction mass. Coating compositions may be applied to wood, metals, e.g. steel, tinplate, rubber, fabrics, paper, leather and the material known under the Registered Trade Mark " Cellophane."