Sizing organic fibers

Claim 1

THE PROCESS WHICH COMPRISES TREATING POLYESTER AND NYLON FIBERS WITH AN AQUEOUS MIXTURE OF A WATER DISPERSIBLE SALT OF A COPOLYMER OF ETHYLENE AND ONE OF ACRYLIC OR METHACRYLIC ACID WHICH COPOLYMER CONTAINS AT LEAST 14 WEIGHT PERCENT, BASED ON THE WEIGHT OF THE COPOLYMER, OF POLYMER UNITS THEREIN DERIVED FROM AT LEAST ONE OF ACRYLIC ACID OR METHACRYLIC ACID, AT LEAST 40 WEIGHT PERCENT OF THE POLYMER UNITS ARE ETHYLENE, AND SAID COPOLYMER HAS A MELT INDEX INDEX BELOW 250 DECIGRAMS PER MINUTE, AND HYDROLYZABLE ORGAO FUNCTIONAL SILANE OFTHE FORMULA XR1SIY3 WHEREIN X CONTAINS A FUNCTIONAL GROUP WHICH IS CONDENSIBLE WITH A CARBOXYLIC, AND R'' IS A SATURATED HYDROCARBON RADICAL CONTAINING AT LEAST THREE CARBON ATOMS IN SEQUENCE THEREIN SEPARATING X FROM SI AND BONDED TO BOTH, PROVIDED THAT WHEN X IS HS-, R'' MAY CONTAIN TWO CARBON ATOMS IN SEQUENCE SEPARATING THE HS-FROM SI AND Y IS HYDROLYZABLE GROUP, THERE BEING AT LEAST ABOUT 0.25 MOLE OF XR'' - PROVIDED BY THE SILANE FOR EACH MOLE OF COOPRESENT IN THE COPOLYMER, WHEREBY TO ADHERE SAID COPOLYMER TO SAID FIBERS.