| 摘要 |
1298566 Graft polymerization process and catalyst therefor SOC RATIONALE DES PETROLES D'AQUITAINE 16 Dec 1969 [17 Dec 1968] 61282/69 Heading C3G A graft polymer is produced by adding to a liquid comprising a polymer in an unactivated condition and a monomer, a catalyst system comprising at least one organometallic compound and at least one generator of free radicals, free oxygen being excluded, and maintaining the reaction system so formed until grafting has occurred. In a modification, free oxygen is used as the free radical generator. Specified organometallic compounds are alkyl, cycloalkyl or aryl derivatives of lithium, magnesium, aluminium, zinc or cadmium. The generator of free radicals may be an organic peroxy compound, a quinone or a phenol, the last two compounds being used in a system consisting of one of the compounds together with an organo-zinc or organo-cadmium compound. In the examples (a) polyethylene, which may have been grafted previously with methyl methacrylate, is grafted with methyl methacrylate, dimethylaminoethyl methacrylate, vinyl acetate or acrylonitrile using diethyl zinc and cumene hydroperoxide as catalyst; (b) polyethylene is grafted with vinyl chloride using diethyl zinc and paramenthane hydroperoxide; (c) polypropylene is grafted with acrylonitrile or dimethylaminoethyl methacrylate using the catalyst as in (a); (d) polyethylene is grafted with methyl methacrylate using diethyl zinc and parabenzoquinone; (e) polystyrene, butyl rubber or ethylene-propylene rubber is grafted with acrylonitrile using the catalyst as in (a); (f) polyethylene is grafted with methyl methacrylate using tributyl aluminium or diethyl cadmium and cumene hydroperoxide; (g) polypropylene is grafted with dimethylaminoethyl methacrylate using butyl lithium and cumene hydroperoxide and (h) polystyrene is grafted with acrylonitrile using dipropyl or diphenyl zinc and cumene hydroperoxide. |
