| 摘要 |
Polyvinylpyrrolidone, or a composition containing polyvinylpyrrolidone, particularly an aqueous solution thereof, is stabilized to heat and light by incorporating therein between 0.1 and 5.0 per cent by weight of zinc formaldehyde sulphoxylate on the weight of the polyvinylpyrrolidone. Fibres of polyacrylonitrile, acrylonitrile copolymers, polyesters, polyamides and hydrocarbon polymers may be stabilized and given a desired polyvinyl pyrrolidone content by impregnating the desired fibre with the sulphoxylate stabilized polyvinyl-pyrrolidone from an aqueous bath at 70 DEG to 100 DEG C., until the desired polyvinylpyrrolidone content is attained.ALSO:Fibres of polyacrylonitrile, acrylonitrile copolymers, polyesters, polyamides and hydrocarbon polymers may be stabilized to heat and light and given a desired polyvinyl pyrrolidone content by impregnating the desired fibre at 70 DEG to 100 DEG C. in an aqueous bath containing polyvinyl pyrrolidone and between 0.1 and 5.0 per cent by weight, based on the weight of polyvinyl pyrrolidone, of zinc formaldehyde sulphoxylate. |
