| 摘要 |
1478221 Basic-dyeable polyamides ALLIED CHEMICAL CORP 2 Jan 1975 [24 Jan 1974] 65/75 Heading C3R Fibres are prepared from a polyamide of the repeating structure -NH-R-CO- or -NH-R-NHCO-R<SP>1</SP>CO-, where R and R<SP>1</SP> are C 3-13 hydrocarbylene, and having 10 to 60 gm. equivalents of amine groups/10<SP>6</SP> g. polymer, in which is incorporated, during or after its preparation, a water-soluble salt of a sulphonated styrene, the salt-forming cation being wholly Li, Mg or Ca, the number of sulphonate groups being equivalent to at least 90% of the theoretical maximum for monosulphonation, and the salt having a M.W. from 15,000 to 300,000 and a pH of 3 to 8 in 30 wt. per cent aqueous solution, the proportion of salt being sufficient to provide 50 to 178 g. equiv. sulphonate/10<SP>6</SP> g. polymer but a g. equiv. ratio of sulphonate to amine groups below 10 : 1. A master batch containing a higher proportion of sulphonate may be prepared and then blended with sulphonate-free polyamide to give a blend containing the required proportion. The salt is preferably added to the polyamide precursor as an aqueous solution, optionally together with M.W. regulators, e.g. acetic, sebacic, azelaic or 5-sulphoisophthalic acid, light stabilizers, e.g. manganese chloride and hypophosphorous acid, or delustrants. Besides improving basic dyeability the salt improves resistance to ozone degradation, especially in conjunction with anthraquinone dyes. In specific examples the polyamide is nylon 6. Reference is made to Specifications 1,223,839 and 1,183,086. |
