| 摘要 |
Fibres formed from at least 75% by weight of polymers of alpha-mono-olefines are treated with a sulphonating or chlorosulphonating agent, and any excess of the agent is then washed out of the fibres. The sulphonation of chlorosulphonation may be followed by amination. The agent may be sulphuryl chloride, chlorosulphonic acid, concentrated sulphuric acid, phosphosulphonic acid, a gaseous mixture of sulphur dioxide and chlorine, or oleum. The fibres may be treated by immersing them for a predetermined length of time in a bath of the agent at room temperature. The fibre is then removed from the bath and may be washed successively with, for example, acetone cooled below room temperature and water, or chloroform and ether, or nitromethane and carbon tetrachloride. In an example, crystalline polypropylene staple fibres having an intrinsic viscosity of 1 are treated fro 20 minutes with sulphuryl chloride at room temperature and then washed successively with petroleum ether, acetone and water. In other examples, fibres composed of mixtures of 90% by weight of polypropylene and 10% of polystyrene are treated with sulphonating or chlorosulphonating agents. In some examples, the treated fibres are immersed in an aqueous solution of polyethyleneimine of 25% concentration at 100 DEG C. for half an hour. Amination of the sulphonated fibres may also be carried out with ethylenimine, ethylene diamine, tetraethylene pentamine, triethylene tetramine or diethylenetriamine. The treatment renders the fibres dyeable (see Group IV(c)). Specification 882,329 is referred to.ALSO:Fibres formed from at least 75% by weight of polymers of alpha-mono-olefins are rendered dyeable with basic dyes and acetate dyes by treating them with a sulphonating or chlorosulphonating agent and thereafter washing them to remove any excess agent (see Group IV(a)). The thus treated fibres may be rendered dyeable with acid dyes by treating them with an aminating agent, particularly a polyimine. Specification 882,329 is referred to.
|
