Fibers flash-spun from blends of polyolefin polymers

Details Fibers flash-spun from blends of polyolefin polymers Fibers flash-spun from blends of polyolefin polymers

D - Textiles, Paper

01

D

D01D 5/11 (2006.01) D01F 6/32 (2006.01) D01F 6/46 (2006.01) D01F 6/52 (2006.01) D01F 6/90 (2006.01) D01F 6/92 (2006.01)

Patent

CA 2242470

A plexifilamentary strand of film-fibrils having a tensile strength of at least 1 gpd and a surface area, measured by the BET nitrogen adsorption method, greater than 2 m2/g. The film-fibrils are comprised of at least 20 % by weight of polyethylene and polypropylene, wherein the polyethylene and polypropylene each comprise at least 5 % by weight of each of the film- fibrils. A process for the production of such a strand is also provided that includes the steps of forming a spin solution of polyethylene and polypropylene polymers in a solvent and spinning the spin solution at a pressure that is greater than the autogenous pressure of the spin solution into a region of substantially lower pressure and at a temperature at least 50 ~C higher than the atmospheric boiling point of the solvent.

La présente invention concerne un brin de fibres plexiformes fibrillées ayant une résistance à la traction d'au moins 1 gpd et une aire, mesurée selon le procédé d'adsorption d'azote BET, supérieure à 2 m?2¿/g. Les fibres fibrillées sont constituées par au moins 20 % en poids de polyéthylène et de polypropylène, chacun représentant au moins 5 % en poids de chacune des fibres fibrillées. L'invention concerne aussi un procédé de production d'un tel brin, procédé qui comprend la formation d'une solution de filage de polymères de polyéthylène et de polypropylène dans un solvant et le filage de la solution, à une pression supérieure à la pression autogène de la solution de filage, vers une plage de pression sensiblement inférieure et à une température supérieure d'au moins 50 degrés C au point d'ébullition du solvant à la pression atmosphérique.

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