Process of making polyolefin fiber

Details Process of making polyolefin fiber Process of making polyolefin fiber

1992-04-13

1993-09-21

Tentoni, Leo B.

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

2642108, 264211, 26421116, D01F 102, D01F 646, D02J 122

Patent

active

052466574

ABSTRACT:
A polyolefin fiber having improved initial elongation and two characteristic melting point peaks, average creep rate, modulus and tensile strength is obtained by milk-kneading a composition containing two different ultra-high-molecular-weight polyolefins each having an intrinsic viscosity of at least 5 dl/g. The first polyolefin is polyethylene. The second polyolefin is an ethylene/.alpha.-olefin copolymer, e.g., ethylene/propylene, wherein the content of the .alpha.-olefin is such that the number of side chains of the .alpha.-olefin per 1000 carbon atoms in the copolymer is from 0.5 to 10, on average. The weight ratio of the ethylene polymer to the ethylene copolymer is from 10/90 to 90/10. The mixture of the two ultra-high-molecular-weight polyolefins is melt-kneaded in the presence of a diluent, such as wax, and the kneaded mixture is spun and drawn to a draw ratio of at least 10.

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