| 摘要 |
Polyacrylonitrile fibres are whitened and given an improved colour stability to heat and ultraviolet light and their basic dye uptake is improved by treating them after spinning with ammonium hypophosphite or aluminium hypophosphite or a mixture thereof prior to drying and then subjecting them to the action of steam under at least atmospheric pressure. The ammonium or aluminium hypophosphite or mixture thereof may be applied to the fibres as an aqueous solution by spraying, as an additive to the finish bath containing for example sorbitol monopalmitate and a quaternary ammonium compound, by wicks or by the use of rolls in an amount of 0.01 - 1% based on the weight of the fibres. The fibres may be made from polyacrylonitrile, from a copolymer containing at least 80% by weight of acrylonitrile or from a blend comprising polyacrylonitrile or copolymers comprising acrylonitrile with 2-50% by weight of another polymeric material, the blend having an overall polymerized acrylonitrile content of at least 80% by weight. In the copolymers the acrylonitrile may be copolymerized with acrylic, cinnamic or methacrylic acid, methyl, ethyl, butyl or methoxymethyl methacrylate or acrylate, methacrylonitrile, acrylamide or methacrylamide or monoalkyl substitution products thereof, methyl vinylketone, vinyl acetate, propionate or stearate, N-vinyl phthalimide, N-vinyl succinimide, methylene malonic esters, itaconic acid or esters thereof, N-vinylcarbazole, sodium p-sulphophenylmethallylether, vinyl furane, alkyl vinyl esters, vinyl sulphonic acid, diethyl citraconate or mesaconate, styrene, vinyl naphthalene, vinyl pyridines, alkyl substituted vinyl pyridines, 1-vinyl-imidazole or alkyl substituted 1-vinyl-imidazoles.
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