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US 4,296,022 AGranted
Polypropylene blend compositions
AssigneeChevron Research Company
InventorRobert L. Hudson
Life of this patent
Estimating the term…
Abstract
A blend of different polypropylene resins which is particularly useful in melt-spinning fine denier yarns. The blend can be melt-extruded into pellets having better spinning properties for melt-spinning fine denier yarns than the individual resins.
Claims5
A polypropylene resin blend, useful for melt-spinning fine denier yarns, which comprises, per 100 parts by weight of total polypropylene resin, about from 70-95 parts of a first polypropylene resin having a melt flow index about of from 30 to 38 and a swell index of about from 1.8 to 2.3;
- about from 5 to 30 parts of a second polypropylene resin having a melt flow index of about from 4 to 35 and a swell index of about from 5 to 7;
- and about 0.2 to 0.5 parts of a hindered phenol melt flow stabilizer for retarding polypropylene polymer degradation during melt extrusion.
Dependencies are inferred from the claim text.