Patent ID: 6291566
Filing Date: 2001-09-18
Classification: D01D

Abstract:
An improved single phase liquid spin solution for flash-spinning plexifilamentary film-fibril strands consisting essentially of 8 to 35 weight percent of a fiber-forming polyolefin and 65 to 92 weight percent of a hydrocarbon/co-solvent spin liquid, the spin liquid consisting essentially of less than 90 weight percent of a hydrocarbon spin liquid selected from the group consisting of isobutane, butane, cyclobutane, 2-methyl butane, 2,2-dimethyl propane, pentane, methyl cyclobutane, cyclopentane, 2,2-dimethylbutane, 2,3-dimethylbutane, 2-methylpentane, 3-methylpentane, hexane, methyl cyclopentane, cyclohexane, 2-methyl hexane, 3-methyl hexane, heptane and mixtures thereof and greater than 10 weight percent of a co-solvent spin liquid having lower solvent strength than said hydrocarbon spin liquid and having an atmospheric boiling point of less than 100.degree. C. and selected from the group consisting of inert gases, hydrofluorocarbons, hydrochlorofluorocarbons, perfluorinated hydrocarbons, polar solvents and mixtures thereof.