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    14.
    发明专利
    未知

    公开(公告)号：FR1133936A

    公开(公告)日：1957-04-03

    申请号：FR1133936D

    申请日：1955-06-09

    Applicant: WESTINGHOUSE ELECTRIC CORP

    Inventor： LEWIS DANIEL W

    IPC: C07F7/08 ,  C07F7/18 ,  C08F30/08 ,  C08G77/00 ,  C08G77/52 ,  H01B3/46

    Abstract: The invention comprises polymerizable organosilicon compounds of the formula: wherein R is a hydrocarbon group free from aliphatic unsaturation, X is a hydrolysable group, and Y is an olefinic hydrocarbon group, and solid thermoset resins obtained by hydrolysis and polymerization thereof. The group R may be aliphatic or aromatic, e.g. methyl, ethyl, propyl, isopropyl, benzyl or phenyl. The olefinic group Y may be vinyl, allyl or vinyl phenyl. The hydrolysable group X may be alkoxy, aryloxy, halogeno or amino. The preparation of p-(dimethylvinylsilyl) phenyldiethoxymethylsilane is described: trichlorovinylsilane is stirred with a Grignard reagent prepared from magnesium, p-dibromobenzene and ether, and the liquid product is refluxed with methyl magnesium bromide in ether, yielding p-bromophenyldimethylvinylsilance. A Grignard reagent prepared from this silane is heated with triethoxymethylsilane to give the above product. The organosilicon monomers may be hydrolysed in water, or in acids such as sulphuric, hydrochloric and picric acids. They may be cohydrolysed with other silanes of the formula SiRnX4-n or: e.g. diethoxymethylphenylsilane, 1,4 - bis-(ethoxydimethylsilyl) benzene, diethoxymethylvinylsilane and 1,4 - bis - (diethoxymethylsilyl) benzene. Solvents, such as benzene, toluene, xylene, diethyl ether, methanol, ethanol and propanol, are preferably present. The polysiloxane hydrolysis products are oily fluids which may be polymerized by heating to about 100 DEG to 180 DEG C. in the presence of a vinyl polymerization catalyst. Suitable catalysts are benzoyl, lauroyl, methylethyl ketone and di-tbutyl peroxides, t-butyl hydroperoxide, ascaridole, t-butyl perbenzoate, di-t-butyl diperphthalate, 2,2-di-t-butyl peroxy butane, and oxonides. Accelerators such as cobalt naphthenate and azomethines may also be employed. Polymerization may also be effected by actinic light. The polysiloxanes may also be dissolved in a liquid reactive unsaturated monomer and copolymerized by heating with a catalyst. Examples of such monomers are styrene, vinyl toluene, methyl styrenes, 2,4-dichlorostyrene, vinyl acetate, methyl and butyl methacrylate, ethyl and allyl acrylate, diallyl phthalate, succinate and maleate, methallyl alcohol, acrylonitrile, methyl vinyl ketone, diallyl ether, allyl crotonate, 1,3-chloroprene, triallyl cyanurate and divinyl benzene. To prevent premature polymerization, less than 1 per cent of an inhibitor may be added to the polysiloxane; suitable compounds being hydroquinone, resorcinol, tannin and sym.a ,BETA-naphthyl p-phenylene diamine. The compositions are useful in preparing laminates, mouldings, e.g. for knife handles, boats, &c., and for coating, impregnating and encapsulating electrical equipment. They may be rendered thixotropic by incorporating about 25-50 per cent by weight of mica flakes, silica, asbestos, glass, &c.

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