The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 21, 1993
Filed:
Apr. 13, 1992
Kazuo Yagi, Ohtake, JP;
Hiroyuki Takeda, Ohno, JP;
Mitsui Petrochemical Industries, Ltd., Tokyo, JP;
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.