| 摘要 |
1396126 Aromatic sulphous levelling agents SANDOZ LTD 26 June 1972 [30 June 1971] 29739/72 Heading D1B [Also in Division C2] A process for dyeing and dyeable synthetic fibres, yarns and textiles from aqueous medium and at a pH value of 5 to 8 is characterised by dyeing in the presence of an aromatic sulphone levelling agent which contains at least one sulphonic acid group and which is produced by a process which is characterised by (a) sulphonation with sulphuric acid and at a temperature of from 80 to 150‹C, of at least one of the starting components comprising a component (i) comprising at least one aromatic phenolic compound containing from 6 to 20 carbon atoms and having at least one hydroxyl group bound to a phenyl ring and a component (ii) comprising at least one aromatic, non-phenolic compound containing from 6 to 20 carbon atoms, from 1 to 30% of component (i) and from 99 to 70% of component (ii), based on the total weight of component (i) and (ii), being employed and removing water of sulphonation produced, and (b) condensing the resulting sulphonation product together with any unsulphonated components (i) and (ii) at a temperature of from 120‹ to 220‹C, until the acid number of the mixture remains substantially constant. The synthetic fibre may be a polyamide or a polyester modified by introduction of carbonamide groups e.g. nylon. |
