Process and finish composition for producing adhesive active polyester yarn

In a process for the production of polyester yarn involving spinning and drawing steps, the improvement which comprises (a) heating the yarn, subsequent to the drawing step, to a temperature of about 190.degree. C. to 220.degree. C.;

• and (b) applying to the yarn an overfinish composition comprising about 50 to 79 weight percent of water and about 21 to 50 weight percent of an oil portion, the oil portion comprising:
• about 6 to 36 weight percent of a triglycidyl ether of glycerol, about 6 to 22 weight percent of 1,4-butanediol diglycidyl ether, about 14 to 50 weight percent of ethoxylated castor oil containing about 6 moles of ethylene oxide per mole of castor oil, about 14 to 50 weight percent of ethoxylated castor oil containing about 25 moles of ethylene oxide per mole of castor oil, and about 6 to 22 weight percent of gamma-glycidoxypropyltrimethoxysilane, a sufficient amount of said overfinish composition being applied to the yarn to provide about 0.4 to 1.5 weight percent based on the weight of the yarn of the overfinish oil on the yarn.