Methods of making different additive-containing filaments

Details Methods of making different additive-containing filaments Methods of making different additive-containing filaments

D - Textiles, Paper

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D01D 5/28 (2006.01) C08J 3/20 (2006.01) C08J 3/22 (2006.01) C08K 9/04 (2006.01) D01F 1/04 (2006.01) D02G 3/02 (2006.01)

Patent

CA 2208218

Methods of continuously producing sequential lengths of different additive-containing melt-spun filaments include continuously supplying a melt-spinnable polymeric host material to orifices of a spinneret and controllably dosing at least one dispersible additive concentrate systems containing a pigment in a liquid nonaqueous polymeric carrier to the melt flow of polymeric host material upstream of the spinneret orifices. In such a manner, a first polymeric mixture of the dispersible additive concentrate system and the polymeric host material is obtaine which achieves an additive attribute. During a first time interval, the first mixture is extruded through the spinneret orifices; and thereafter, during a second subsequent time interval, the dosing of the at least one dispersible additive is changed so as to form a second mixture having a second additive attribute different from the first additive attribute while continuously supplying the melt flow of polymeric host material to the spinneret orifices. The melt-spun filaments will thus have a first length corresponding to the first additive attribute of the first mixture and a second subsequent length corresponding to the second additive attribute of the second mixture. The methods and additives employed most preferably achieve Hunter Green Purge Values of between about 0.10 to about 1.40 sec/cm3.

Méthodes pour produire en continu des longueurs séquentielles de filaments filés à chaud renfermant différents additifs, consistant notamment à introduire en continu une matière hôte polymère filable à chaud dans les orifices de filières et à réguler l'ajout d'au moins un système concentré additif dispersable, renfermant un pigment dans un véhicule polymère liquide non aqueux, au flux en fusion de matière hôte polymère en amont des orifices. De cette façon, on obtient un premier mélange polymère du concentré additif dispersable et de la matière hôte polymère, mélange possédant la caractéristique de l'additif. Pendant un premier intervalle de temps, le premier mélange est extrudé à travers les orifices de la filière; ensuite, pendant un deuxième intervalle, le dosage d'au moins un additif dispersable est modifié pour donner un second mélange possédant une seconde caractéristique d'addition tout en continuant à alimenter les orifices avec le flux en fusion de matière hôte polymère. Les filaments filés à chaud formeront ainsi une première longueur correspondant à la première caractéristique d'addition du premier mélange et une seconde longueur consécutive correspondant à la seconde caractéristique du deuxième mélange. Les méthodes et additifs employés correspondent de préférence à des valeurs Hunter Green Purge se situant entre 0,10 et 1,40 s/cm3 environ .

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