Spin finish compositions for polyester and polyamide yarns

Claim 1

A spin finish composition suitable for application to polyester or polyamide yarns for ultra-high speed texturing with a yarn speed of 600m/min or greater, said composition comprising (A) a base oil of one or more polyether compounds which are o-methoxypoly (oxyethylene/oxypropylene) ether derivatives synthesizable from an alcohol shown by (where A and B are independently alkyl group with 1 to 4 carbon atoms or hydroxy methyl group and n is 1 or 2), 1,2-propylene oxide and a methylator, the average molecular weight of said polyether compounds being 1500 to 6000 and the average weight ratio of oxyethylene/ oxypropylene thereof being 5-50/95-50; and (B) 0.05 to 10 weight % of one or more polyalkylene oxide modified polysiloxanes of average molecular weight no less than 2500 shown by (where X is p is an integer in the range of 20 to 100; m is an integer of 1 to 9 and Y is wherein R 1 is an alkylene group with 3 to 4 carbon atoms, R 2 is hydrogen, an alkyl group with 1 to 8 carbon atoms or an acyl group with 2 to 8 carbon atoms; a and b are integers satisfying the conditions 15 ≦ a+b < 80 and 2/8 < b/a < 8/2; the polydimethyl siloxane part shown by X and the polyalkylene oxide modified siloxane part shown by Y may be repeated either by block repetition or by random repetition; and the repeating parts marked by a and b may be either by block repetition or by random repetition).

Claim 6

A method of ultra high speed texturing a polyester of polyamide yarn at a yarn speed of 600m/min or greater, including the step of applying to the yarn before texturing a composition according to any of claims 1-4.