Patent GB-388309-A (GB)
Title: Improvements in plastic compositions
IPC: C08K3/00
Filed: 1932-08-04
Abstract: Vinyl resins at least 70 per cent insoluble in toluene at 20-30 DEG C. are manufactured by the conjoint polymerization of a vinyl halide, e.g. vinyl chloride, and an oxygen-containing vinyl compound, e.g. vinyl acetate, in the proportions of at least 70 per cent of the halide and not more than 30 per cent of the oxygen-containing compound.  Examples describe the production of resins by the polymerization of mixtures of 80 per cent of vinyl chloride and 20 per cent of vinyl acetate, e.g. with the aid of benzoyl peroxide.ALSO:Plastic compositions comprise a substantial proportion of a vinyl resin resulting from the conjoint polymerization of a vinyl halide, e.g. vinyl chloride, and an oxygen-containing vinyl compound, e.g. vinyl acetate, in the proportions of at least 70 per cent of the halide and not more than 30 per cent of the oxygen-containing compound, which resin is at least about 70 per cent insoluble in toluene at 20-30 DEG  C., together with a stabilizing material and/or a filling material and/or a plasticizing material. Colouring matter may also be included. Examples of stabilizers are calcium stearate, lime, the reaction product of calcium hydrate and manilla copal, ethyl toluidine, benzidine, tribenzyl amine, and ethanolamines.  Fillers may be cellulosic, e.g. wood flour, cork, cotton flock, and linters, and paper pulp, or non-cellulosic, e.g. barytes, silica, mica, asbestos, talc, and rotten stone.  Suitable plasticizers are phthalic acid esters, halogenated naphthalene derivatives, carnauba wax, rubber fractions, chlorinated diphenyl derivatives, tricresyl derivatives, and glycol esters.  Typical proportions are 25-70 parts of filler, 1-5 parts of plasticizer, and 75-30 parts of coloured and stabilized resin.  Another type of product, especially for forming thin sheets of insulating packing material, contains a large proportion of plasticizer.  The composition can be used for making moulded objects, sound and like records, wall and floor surfacing material, in which case the composition may be applied to a backing of burlap, insulating and packing material, &c.  In examples, (1) a moulding composition especially for sound records comprises 50 parts of vinyl resin, 30 parts of barytes, 20 parts of rotten stone, ,5 parts of calcium stearate, ,5 parts of carnauba wax, and ,5 parts of lime.  The resin is prepared by polymerizing a mixture containing 80 per cent of vinyl chloride and 20 per cent of vinyl acetate in the presence of benzoyl peroxide, and is less than 25 per cent soluble in cold toluene.  The composition may be moulded directly into phonograph records, or flexible records may be formed by moulding the composition on to a flexible cellulosic or like sheet; (2) a highly plastic composition comprises 100 parts of vinyl resin, formed by the conjoint polymerization of 80 parts of vinyl chloride and 20 parts of vinyl acetate, 60 parts of ethylene glycol monoethyl ether diester of ethylene glycol diphthalate, 1 part of carnauba wax, 1 part of calcium stearate and 1 part of calcium hydrate; the composition may be used as an ingredient of varnishes and lacquers, and may be mixed with filling materials; a transparent wrapping material comprises 100 parts of vinyl resin (80 parts of vinyl chloride and 20 parts of vinyl acetate), 20 parts of dibutyl phthalate, 2,5 parts of carnauba wax, and 1 part of calcium stearate; the composition is fluxed on hot differential rolls and sheeted to a thickness of about ,001 in.; the composition may also be coloured and perfumed.  Other examples are given.