Process for dyeing shaped structures of aromatic polyesters, especially of polyethylene terephthalates
Номер патента: GB846491A
Опубликовано: 31-08-1960
Автор(ы):
Принадлежит: Farbwerke Hoechst AG, Hoechst AG
Опубликовано: 31-08-1960
Автор(ы):
Принадлежит: Farbwerke Hoechst AG, Hoechst AG
Реферат: Fibres, films and other shaped structures of aromatic polyesters are dyed with insoluble azo dyestuffs prepared from 2 : 3-hydroxynaphthoic acid or a derivative thereof substituted in the 6-position as coupling component and a mono-or di-amine of the azobenzene or diphenyl series as diazo component by treating the structures in a bath containing both components, first under alkaline conditions, and then under acid conditions, and subsequently effecting diazotisation and coupling. Examples are given.
Process for dyeing polyester fibres
Номер патента: GB779803A. Автор: . Владелец: Bayer AG. Дата публикации: 1957-07-24.