| 摘要 |
1457713 Dyeing polyesters BAYER AG 18 April 1975 [3 May 1974] 16098/75 Heading C3R [Also in Division C4] Linear polyesters are dyed using dyestuffs of the formula in which R is C 1-4 alkyl; B and B 1 are hydrogen, optionally substituted alkyl, alkenyl, cycloalkyl, aralkyl, aryl or heteroaryl, or together with the N-atom form a ring; and the ring A is optionally substituted by 1 to 3 non-ionic substituents. The examples describe dyeing polyethylene terephthalate and the polyester derived from terephthalic acid and 1,4-bis- (hydroxymethyl)cyclohexane with various dyestuffs of the above formula, e.g. |
