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US 3,963,434 AGranted
Carboxymethylated cotton fabric with improved conditioned and wet wrinkle recovery by reaction with propylene or ethylene carbonate
AssigneeThe United States of America as represented by the Secretary of Agriculture
InventorsTruman L. Ward, Ruth R. Benerito, Dorothy M. Perrier
Life of this patent
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Abstract
Partially carboxymethylated-cotton fabric prepared by a non-aqueous procedure is reacted with either ethylene carbonate or propylene carbonate in a heated, evacuated oven. The product of either reaction is a fabric with high conditioned and high wet wrinkle recovery.
Claims4
A process for imparting high conditioned (dry) and high wet wrinkle recovery to partially carboxymethylated-cotton fabric, the process comprising:
- a. impregnating a cotton fabric which has been carboxymethylated to a degree of substitution of about from 0.1 to 0.3 by a non-aqueous procedure, with a neat heterocyclic carbonate selected from the group consisting of ethylene carbonate, propylene carbonate, and a mixture of ethylene and propylene carbonate, to a pickup of about 100%,
- b. placing the wet, impregnated CMC fabric in a vacuum oven preheated to a temperature of about from 160.degree. to 180.degree. ,
- c. evacuating the oven to obtain a pressure of about 35 mm of mercury,
- d. maintaining the temperature and vacuum for about from 30 to 120 minutes to obtain reaction, and
- e. releasing the vacuum and washing the reacted fabric to remove all unreacted material.
2 more elements
Dependencies are inferred from the claim text.