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    Polyester resinous molding compositions and electrical conductor formed therewith
    3.
    发明授权
    Polyester resinous molding compositions and electrical conductor formed therewith 失效
    聚酯树脂成型组合物和与其形成的电导体

    公开(公告)号：US2840538A

    公开(公告)日：1958-06-24

    申请号：US50076455

    申请日：1955-04-12

    Applicant: WESTINGHOUSE ELECTRIC CORP

    Inventor： MINTER HERBERT F ,  JACK SWISS

    IPC: C08K3/00

    CPC classification number: C08K3/013 ,  C08L67/06

    Abstract: Thermosetting resinous moulding compositions comprise (A) 10 to 70 parts by weight of a finely-divided solid filler of average particle size below 1 micron and (B) 90 to 30 parts of a polyester resin derived by heating above 150 DEG C. but not exceeding 250 DEG C. (a) one mol. of at least one unsaturated dicarboxylic acid selected from fumaric acid, maleic acid, maleic anhydride, citraconic acid and citraconic anhydride; (b) 3 to 5 mols. of adipic acid; (c) 7 to 9 mols. of succinic acid; (d) 0.5 to 5 mols. of propylene glycol; and (e) 14 to 9 mols. of ethylene glycol, the glycols providing at least 5 but not over 15 per cent numerical excess of hydroxyl over carboxyl groups. Up to 20 mol. per cent of the glycols may be replaced by higher glycols, e.g. diethylene glycol, 1,3-butylene glycol, triethylene glycol and neopentylene glycol, and 0.1 to 0.75 mols. of glycerol may also be included. Specified fillers are silica, calcium carbonate, aluminium silicate, magnesium silicate, talc, iron oxides, diatomaceous earth, hydrated alumina, hydrated silicates, mica, kaolin, bentonite and glass. The filler particles may be coated with resins, e.g. a melamine resin, soaps, e.g. aluminium and magnesium stearates, oils, e.g. tall oil, or fatty acids, e.g. stearic acid. Up to 30 per cent of the filler may be replaced by fibrous materials, e.g. asbestos, cotton, nylon, acrylonitrile resin and glass fibres. Plasticisers, e.g. tricresyl phosphate and dioctyl phthalate, inhibitors, e.g. hydroquinone, resorcinol, tannin, sym-alpha, beta-naphthyl p-phenylene diamine and N-phenyl-beta-naphthylamine, and, prior to use, catalysts, e.g. benzoyl peroxide, tertiary butyl hydroperoxide, ditertiary butyl peroxide, tertiary butyl perbenzoate and ditertiary butyl diperphthalate, may be added. The compositions may be used to form electrical insulation.

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