Polyester fibres or threads with high pill resistance

D - Textiles – Paper – 01 – F

Patent

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Details

D01F 6/92 (2006.01)

Patent

CA 2214007

In order to manufacture polyester fibres with high pill resistance, it is proposed (1) that a polyalkylene glycol block mixed copolymer of the formula (I), in which the polyoxypropylene core has a mean molecular weight of 3000- 4000 and the polyoxyethylene groups form 20-60 wt % of the block copolymer which has a mean molecular weight of 3750-10,000, should be added evenly as a separate phase to a polyester component at least 90 mol % of which is polyethylene terephthalate, the addition being carried out after polycondensation (2) of the polyester component, and the quantity of polyethylene glycol block mixed copolymer being 1-7 wt % of the polyester component. The two components thus mixed are then spun together in the usual way. The polyester component consists preferably of polyethylene terephthalate, to which 2-4 wt % of the block copolymer is added.

L'invention concerne la fabrication de fibres de polyester présentant une résistance élevée au boulochage. A cet effet, il est proposé (1) qu'un copolymère mixte séquencé de polyalkylène-glycol de la formule (I), dans laquelle le noyau polyoxypropylène a un poids moléculaire moyen de 3000 - 4000 et les groupes polyoxyéthylène constituent 20 à 60 % en poids du copolymère séquencé qui a un poids moléculaire moyen de 3750 - 1000, soit ajouté régulièrement en tant que phase séparée à un composant polyester dont au moins 90 % en moles sont du polyéthylène-téréphtalate, cette adition étant réalisée après polycondensation (2) dudit composant polyester, et la quantité de copolymère mixte séquencé de polyéthylène-glycol représentant 1 à 7 % en poids du composant polyester. Les deux composants ainsi mélangés sont ensuite filés ensemble de la façon habituelle. Le composant polyester est de préférence du polyéthylène-téréphtalate auquel sont ajoutés 2 à 4 % en poids du copolymère séquencé.

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