Flash-spinning process and solution

Details Flash-spinning process and solution Flash-spinning process and solution

D - Textiles, Paper

01

D

D01D 5/11 (2006.01) D01F 6/04 (2006.01) D01F 6/12 (2006.01)

Patent

CA 2376499

A process for the preparation of plexifilamentary film-fibril strands of synthetic fiber-forming polymer comprises the steps of generating a spin fluid and flash-spinning the spin fluid to form plexifilamentary film-fibril strands of the synthetic fiber-forming polymer. The spin fluid consists essentially of (a) 5 to 30 wt.% of a synthetic fiber-forming polymer, (b) a primary spin agent selected from the group consisting of hydrocarbons with 4 to 7 carbon atoms, and chlorinated, brominated and fluorinated compounds, and (c) a co- spin agent co-spin agent selected from the group consisting essentially of fluorinated organic compounds containing 4 to 8 carbon atoms and a double bond, and having an atmospheric boiling point of less than 100 ~C. The co-spin agent is present in the spin fluid in an amount sufficient to raise the cloud point pressure of the spin fluid by at least 50 pounds per square inch (345 kPa). A spin fluid used in the process of the invention is also provided.

La présente invention concerne un procédé de préparation de brins fibrillés plexifilamentaires d'un polymère synthétique fibrogène, comprenant la production d'un fluide de filage et le filage éclair du fluide de filage pour former des brins fibrillés plexifilamentaires du polymère synthétique fibrogène. Le fluide de filage comprend essentiellement (a) 5 à 30 % en poids d'un polymère synthétique fibrogène, (b) un premier agent de filage choisi parmi le groupe comprenant des hydrocarbures ayant de 4 à 7 atomes de carbone, et des composés chlorés, bromés et fluorés, et (c) un co-agent de filage choisi parmi le groupe comprenant essentiellement les composés organiques fluorés contenant 4 à 8 atomes de carbone et une double liaison, et ayant un point d'ébullition à pression atmosphérique inférieur à 100 ·C. Le co-agent de filage est présent dans le fluide de filage en quantité suffisante pour faire augmenter la pression de point de trouble du fluide de filage d'au moins 50 livres par pouce-carré (345 kPa). Cette invention concerne également un fluide de filage utilisé dans le procédé de l'invention.

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