Method for insitu coloring crosslinked cellulosic materials
AssigneeThe United States of America as represented by the Secretary of Agriculture
InventorsEugene J. Blanchard, Joseph S. Bruno
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Abstract
Cellulosic materials, such as cotton fabrics, can be colored insitu by first treating the fabric with N-phenyldiethanolamine and a crosslinking agent for cellulose, such as dimethylol dihydroxyethyleneurea. After the fabric has been cured it is then colored by treating with sufficient concentrations of nitrous acid to form the colored nitroso derivative of the tertiary aromatic amine. The colors obtained are shades of green and yellow which are determined by: concentration of the N-phenyldiethanolamine; type of crosslinking agent; strength of the nitrous acid, and reaction times.
Claims14
A process for coloring cellulose containing fabric comprising:
- (a) padding a cellulose containing fabric with a solution of sufficient concentrations of:
- methylolated crosslinking agent, an effective amount of N-phenyl tertiary amine containing sufficient hydroxy functionality to form a colored nitroso derivative of said N-phenyl tertiary amine, and an acid catalyst to impart smooth-dry properties to said fabric;
- (b) drying and curing said fabric for sufficient time and temperature to interact the componments of the solution with the fabric;
- (c) immersing the fabric in a solution of sufficient concentration of nitrous acid for sufficient time to color said fabric.
A colored cellulose containing smooth-dry fabric characterized by a colored nitroso derivative of a N-phenyl tertiary amine crosslinked on said fabric through hydroxy functionality present on said tertiary N-phenyl amine.
Dependencies are inferred from the claim text.