Appeal No. 1998-3094
Application No. 08/550,968
THE INVENTION
The appellants claim a solution for flash-spinning
plexifilimentary film-fibril strands of a fiber-forming
crystalline polyolefin. The solution contains at least one
charge-improving compound which, the appellants state, is for
providing satisfactory electrostatic web charging performance
of a flash spun plexifilimentary film fibril web at acceptable
charge currents using and an environmentally suitable solvent
(specification, page 3, lines 8-11). Claim 37 is
illustrative:
37. A solution for flash-spinning plexifilamentary
film-fibril strands 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 C -C hydrocarbon
4 7
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 100 Co
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
2
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