| 摘要 |
1,269,986. Porous cross-linked copolymers and ion-exchange resins. MITSUBISHI CHEMICAL INDUSTRIES Ltd. 10 April, 1969, No. 18496/69. Headings C3C and C3P. A porous, cross-linked copolymer is made by (i) effecting in aqueous suspension copolymerization of a monovinyl or monovinylidene monomer and a polyvinyl or polyvinylidene monomer in the presence of a free radical initiator, an organic solvent and a linear monovinyl or monovinylidene polymer at a temperature above the dissociation temperature of the initiator, and (ii) subsequently extracting with a solvent the linear polymer from the copolymer resulting from the copolymerization, the organic solvent being insoluble in water and capable of dissolving the monomers and of swelling the copolymer, and the linear polymer constituting a homogeneous phase with the monomers and solvent and having an average molecular weight of from 3000 to 300,000. Ion-exchange groups may be introduced into the copolymer either after the extraction of the linear polymer or during the extraction of the linear polymer. In the examples styrene or ethyl acrylate and divinylbenzene were polymerized in an aqueous mixture of polystyrene or polyvinyl acetate, toluene or carbon tetrachloride, benzoyl peroxide and polyvinyl alcohol and the polystyrene or polyvinyl acetate respectively was extracted with a solvent. The copolymer was then made into an ion-exchange resin by treatment with (i) sulphuric acid and then sodium carbonate, (ii) chloromethyl methyl ether and zinc chloride, and then trimethylamine or dimethylamine and sodium hydroxide, or (iii) sodium hydroxide and then hydrochloric acid. |
