Composition and method for imparting increased water repellency to substrates and substrates treated with same
Assignee3M Innovative Properties Company
InventorChetan P. Jariwala
Life of this patent
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Abstract
A treatment composition for imparting water repellency to articles comprising a blend of one or more fluorochemical esters and one or more polycarbodiimides, a method for treating articles with such composition, and the articles produced thereby. The treatment composition and method are especially well suited for use by consumers on personal articles such as garments.
Claims14
A method for imparting water repellency to a fabric substrate comprising (1) applying to a portion of the surface of said fabric substrate a treatment composition comprising an aqueous emulsion of a blend of (A) one or more fluorochemical esters and (B) one or more polycarbodiimides, and (2) drying said treatment composition at a temperature of about 50° C. to about 85° C. for about 45 to about 60 minutes;
- wherein said (A) fluorochemical ester is of the formula:
- Rf—O—C(O)—R1
- wherein Rf is selected from the group consisting of:
- (1) F(CF2)x(CH2)m wherein x is from 4 to 20 and m is from 0 to 6;
- and (2) F(CF2)xSO2N(R2)R3 wherein x is a positive integer from 4 to 20, R2 is an alkyl radical of from 1 to 4 carbon atoms, and R3 is an alkylene radical of from 1 to 12 carbon atoms;
- and R1 is an aliphatic hydrocarbon having from 12 to 76 carbon atoms;
- wherein said treatment composition comprises from about 0.5 to about 2.5 parts by weight solids of said blend per 100 parts by weight and wherein the weight ratio of (A) to (B) is from about 25:75 to about 75:25.
A method for imparting water repellency to a fabric substrate comprising
- (1) applying to a portion of the surface of said fabric substrate a treatment composition comprising an aqueous emulsion of a blend of
- (A) one or more fluorochemical esters and
- (B) one or more polycarbodiimides, and
- (2) drying said treatment composition at a temperature of about 50° C. to about 85° C. for about 45 minutes to about 60 minutes;
- wherein said (A) fluorochemical ester is of the formula:
- Rf—O—C(O)—R1
- wherein Rf is selected from the group consisting of:
- (1) F(CF2)x(CH2)m wherein x is from 4 to 20 and m is from 0 to 6;
- and (2) F(CF2)xSO2N(R2)R3 wherein x is a positive integer from 4 to 20, R2 is an alkyl radical of from 1 to 4 carbon atoms, and R3 is an alkylene radical of from 1 to 12 carbon atoms;
- and R1 is a linear, saturated, aliphatic hydrocarbon having from 12 to 76 carbon atoms;
- wherein said treatment composition comprises from about 0.5 to about 2.5 parts by weight solids of said blend per 100 parts by weight and wherein the weight ratio of (A) to (B) is from about 25:75 to about 75:25.
Dependencies are inferred from the claim text.