| 摘要 |
1,158,375. Preparation of sulphur containing dyes. UGINE KUHLMANN. 28 March, 1968 [31 March, 1967], No. 14845/68. Heading C4P. Sulphur containing dyes are prepared by treating a dyestuff containing in its molecule at least two SO 2 X groups in which X is a hydrogen or halogen atom or a monovalent cation or an SY group in which Y is hydrogen or a monovalent cation with a thioamide in aqueous acid medium at 0-100‹ C., examples of phthalocyanine and dioxazine dyes being provided. |
