FLASH-SPINNING PROCESS AND SOLUTION

摘要

A process for the preparation of plexifilamentary film-fibril strands of synthetic fiber-forming polymer comprises the steps of generating a spin flu id and flash-spinning the spin fluid to form plexifilamentary film-fibril stran ds 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-sp in agent is present in the spin fluid in an amount sufficient to raise the clou d 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.