Non-formaldehyde durable press finishing for cellulosic textiles with phosphonoalkylpolycarboxylic acid
AssigneePPG Indutstries, Inc.
InventorsRobert H. Tang, William A. Williams, Jr.
Life of this patent
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Abstract
A composition and method for providing a non-formaldehyde durable press finish to cellulosic fabrics by employing phosphonoalkylpolycarboxylic acids are disclosed. The phosphonoalkylpolycarboxylic acid is optimally used in combination with another polycarboxylic acid, such as polyacrylic acid, and/or, for cost effectiveness, a low-cost polycarboxylic acid such as citric acid. The catalyst for the curing reaction is optimally a phosphorus-containing acid or alkali metal salt thereof, such as a mixture of sodium monophosphate and sodium hypophosphite.
Claims18
A method for treating cellulose-containing fibrous materials free from the generation of formaldehyde and free from formaldehyde condensates comprising the steps of:
- (a) treating said fibrous material with an aqueous solution comprising (i) phosphonoalkylpolycarboxylic acid having at least one phosphono group, at least two carboxylic groups and wherein the alkyl group of said acid contains from 3 to 8 carbon atoms, and (ii) polyacrylic acid having a weight average molecular weight less than 8000, and (iii) a catalytic amount of esterification catalyst, said phosphonoalkylpolycarboxylic acid being at least 10 mole percent of the polycarboxylic acids in the aqueous treating solution, and
- (b) heating said treated fibrous material at temperatures and for a time sufficient to effect the crosslinking of cellulose in said fibrous material.
A method for treating cellulose-containing fibrous material free from the generation of formaldehyde and free from formaldehyde condensates comprising the steps of:
- (a) treating said fibrous material with an aqueous solution comprising (i) phosphonoalkylpolycarboxylic acid having at least one phosphono group, from 3 to 6 carboxylic groups and wherein the alkyl group of said acid contains from 3 to 8 carbon atoms, (ii) polyacrylic acid having a weight average molecular weight of from about 300 to about 5000, and (iii) a catalytic amount of esterification catalyst, said phosphonoalkylpolycarboxylic acid being at least 10 mole percent of the polycarboxylic acids in the aqueous treating solution, and
- (b) heating said treated fibrous material at temperatures of from about 130.degree. C. to about 200.degree. C. for from about 3 to about 10 minutes.
Dependencies are inferred from the claim text.