Celanese Gmbh

Celanese Acetate Limited

Gerard Lees

M Ishaq Haider

John D Gibbon

Norman S Anderson

Ronald L Griffith

The invention is directed to LCP monofilaments and yarn made therefrom which have improved adhesion properties, said monofilaments, and yarn made therefrom, comprising a liquid crystalline polymer filament having a finish selected from the group consisting of esters formed between (a) pentaerythritol and saturated polyols of up to 10 carbon atoms and 2 to 6 hydroxyl groups, and (b) a carboxylic acid of formula C.sub.x H.sub.2x=1 COOH, wherein x is from 2 to 20, and wherein 2 to 6 of the hydroxy functions are converted to ester functions. In a preferred embodiment of the invention the finish is an ester formed from the reaction of pentaerythritol and a carboxylic acid of formula C.sub.x H.sub.2x=1 COOH, wherein x is from 2 to 20, and preferably between 14 and 20. The most preferred esters are pentaerythritol tetrapelargonate and pentaerythritol tetraisostearate.

Liquid crystalline polymer monofilaments having improved adhesion

The invention provides partially oriented polyester yarn finishes capable of substantially reducing the level of broken filaments resulting from polyester yarn texturing. Finishes of the invention are a stable oil-in-water emulsion with the oil phase including a polyester yarn texturing lubricant. The emulsion finish has a pH of at least 9.0, preferably between about 10 and about 11.5.

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Charlotte, NC, United States of America

Gerard Lees