D - Textiles – Paper – 01 – F
Patent
D - Textiles, Paper
01
F
D01F 6/62 (2006.01) C08G 63/692 (2006.01) C09K 21/14 (2006.01) D01F 6/84 (2006.01) D02J 1/22 (2006.01)
Patent
CA 2138465
High tenacity, low flammability polyester yarn, production thereof and use thereof Described is a low flammability multifilament yarn especially for use in industry, composed of a polyester formed from dicarboxylic acid and diol components which contains, in the polymer chain, units of the formula I Image where R is a saturated open-chain or cyclic alkylene, arylene or aralkylene radical, and R1 is an alkyl radical of up to 6 carbon atoms or an aryl or aralkyl radical, characterized by a tenacity (F) of at least 65 cN/tex, a total burn time, when made into a loomstate cloth and subjected to the flammability test of DIN 4102/B2, which is at least 5, preferably 10, times shorter than that of a comparable loom- state cloth composed of non-phosphorus-modified polyester, and by the absence of afterburning on 3 and 15 sec flaming according to DIN 54336 and 3 sec flaming according to DIN 54333. Also described is a process for producing this polyester yarn by subjecting filaments which have spun at a spinning take-off speed of above of 300 m/min to at least two-stage drawing, each stage being carried out at a defined temperature and to a defined proportion of the total draw, and optionally to a setting and relaxing treatment at defined temperatures and a defined shrinkage ratio. Also described are various uses for the yarn.
Bennett Jones Llp
Hoechst Aktiengesellschaft
Invista Technologies S.a R.l.
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