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US 4,312,634 AGranted
Method for treating cellulosic materials prior to bleaching
OwnerJerome Katzinventor
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OwnerJerome Katzinventor
Estimating the term…
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.
A process for treating cellulosic goods prior to bleaching for a time sufficient to achieve commercially acceptable whiteness in a chemical bleach solution comprising the step of:
A process for treating cellulosic goods prior to bleaching for a time sufficient to achieve commercially acceptable whiteness in a chemical bleach solution, consisting essentially of intimately contacting said goods with water for up to 31/2 minutes prior to bleaching, said water being substantially free of heavy metal ions and having a temperature from just above ambient to 212.degree. F.
A process for bleaching cotton and other cellulosic goods comprising the steps of:
Dependencies are inferred from the claim text.