Bleaching and dyeing; fluid treatment and chemical modification – Bleaching – Chemical
Patent
1979-10-16
1982-01-26
Tungol, Maria Parrish
Bleaching and dyeing; fluid treatment and chemical modification
Bleaching
Chemical
8101, 8107, 8125, 8127, 8139, D06L 302
Patent
active
043126340
ABSTRACT:
Chemical bleaching pretreatment processes are provided for cotton goods and other cellulosic materials which have the effect of enhancing the bleached cloth whiteness levels and/or reducing the bleaching time or intensity. The goods may be pretreated by intimately contacting them, as by immersion in a bath, in an alkaline scour solution having a pH of 10 to 14 and a temperature of 160.degree.-212.degree. F. for from 5 seconds to 31/2 minutes. A second and separate pretreatment involves immersing the goods in such an alkaline scour solution and, immediately prior or subsequent thereto, in an acid solution having a pH less than about 3 at a temperature in the range 45.degree. to 212.degree. F. for from 1 to 10 seconds. Optionally, either the alkaline scour pretreatment or the combination acid/alkaline scour pretreatment may be preceded by an up to 31/2 minute water dip or rinse in water ranging from just above ambient to 212.degree. F. In some cases the water dip or rinse without alkaline scour or acid/alkaline scour may constitute the entire bleaching pretreatment.
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