Minnesota Mining and Manufacturing Company

Maynard H Olson

John C Chang

Imelda A Muggli

David A Bultman

A method for imparting to fibrous polyamide materials stain resistance to acid colorants is provided. The method comprises contacting the fibrous polyamide materials with an aqueous treating solution comprising polymethacrylic acid, copolymers of methacrylic acid, or combinations thereof, and drying said substrate, said polymethacrylic acid, copolymers of methacrylic acid, or combinations thereof being provided in a sufficient amount and having a solubility and molecular weight such that said fibrous polyamide substrate has an improved acid colorant stain resistance.

Process for providing polyamide materials with stain resistance

A treated fibrous polyamide substrate having resistance to staining by acid colorants is provided. The treated substrate comprises a fibrous polyamide substrate having applied thereto (a) a partially sulfonated novolak resin and (b) polymethacrylic acid, copolymers of methacrylic acid, or combinations of said polymethacrylic acid and said copolymers of methacrylic acid.

Process for providing polyamide materials with stain resistance with

The formation of acid mist or spray over metal electrowinning tanks, such as in the electrowinning of copper obtained by solvent extraction, is substantially inhibited or eliminated by electrowinning the metal from electrolyte containing certain cationic and/or amphoteric fluoroaliphatic surfactants.

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North St. Paul, MN, United States of America

Maynard H Olson