| 摘要 |
1508956 Porous vinyl/polyvinyl copolymer fibres MITSUBISHI RAYON CO Ltd 11 Aug 1976 33376/76 Heading C3C Porous fibres are made by impregnating organic fibres with 50-400%, based on the wt. of the fibre, of a liquid comprising at least one free-radical polymerizable monovinyl monomer and having a boiling point of at least 30‹ C. at atmospheric pressure and at least one copolymerizable polyvinyl monomer containing a polymerization initiator, the fibres being capable of being swollen by 30-500 vol. per cent with the liquid, polymerizing the monomers absorbed in the fibres and then dissolving out or decomposing the fibres, e.g. with a solvent or decomposing agent for the fibres. In the Examples (1-10) mixtures of (A) ethyl or methyl methacrylate, styrene, o- and p-vinylbenzyl chloride, acrylamide, acrylic acid, itaconic acid and/or methacrylic acid, (B) divinylbenzene, or methylene bisacrylamide and (C) a free radical polymerization initiator with optionally toluene tetrachloroethane, methyl acetate or aq. ammonia were used to impregnate cellulose di- or tri-acetate filament yarns or fibres, polyethylene terephthalate fibres or polycaproamide fibres which were then heated by immersion in heated baths of aq. Glauber's salt, water or saturated brine to polymerize the monomers and the substrate fibres were then removed by treatment with aq. sulphonic acid, dichloromethane, or acetone to produce porous fibres of cross-linked polymers. In Examples 9-14 the polymerized monomers were treated with ammonia, pentaethylenehexamine, sodium hydroxide, ethylene diamine, potassium hydroxide, sulphuric acid, trimethylamine and/or hydrochloric acid to form fibres having a cation or anion exchange capacity. |
