Patent ID: 6455619
Filing Date: 2002-09-24
Classification: D01D

Abstract:
A solution for flash-spinning plexifilamentary film-fibril stands of a fiber-forming crystalline polyolefin, said solution consisting essentially of 8 to 35 weight percent of the polyolefin and 92 to 65 weight percent of a spin liquid comprising a mixture of at least one saturated C4-C7 hydrocarbon and at least one charge-improving compound belonging to one of groups A and B,wherein group A comprises compounds that have an atmospheric boiling temperature of less than 100Â° C. and consists of one of carbon dioxide, hydrofluorocarbons, hydrochlorofluorocarbons, perfluoro-carbons, alcohols, aliphatic ketones, and polar solvents; and wherein group B consists of compounds not listed in group A that are within the following categories of compounds; compounds of the types listed in group A except having atmospheric boiling temperatures of at least 100Â° C.; halogen gases; acid halides; halocarbons that are not listed in group A; hydroxylic compounds, ethers, carboxylic acids; esters; sulfur compounds; non-aliphatic ketones; aldehydes; nitro compounds; nitrogen oxides; nitriles; ammonia; amines; amides; and halogenated derivatives of the above compounds which do not already contain a halogen atom; such that said spin liquid comprises at least 0.1 ppm and no more than 1% of charge-improving compounds, up to ten weight percent of group A charge-improving compounds, and less than seventy-five weight percent of group B charge improving compounds.