Stretched polyethylene filaments of high strength and high modulus, and their production

• US 4,617,233 A
• Filed: 05/21/1984
• Issued: 10/14/1986
• Est. Priority Date: 05/20/1983
• Status: Expired due to Term

• Current Assignee: Toyoda Gosei Company Limited (Toyota Motor Corporation)
• Original Assignee: Toyoda Gosei Company Limited (Toyota Motor Corporation)
• Inventors: Okada, Fujio, Ohta, Toshihiko, Okumoto, Kiyokazu
• Primary Examiner(s): KENDELL, LORRAINE
• Application Number:
  US06/612,240
• Time in Patent Office: 876 Days
• Field of Search: 428/364, 428/902, 526/348.1, 524/108, 524/366, 264/210.8, 264/210.7, 264/290.5
• US Class Current: 428/364
• CPC Class Codes: D01F 6/04 from polyolefins
• CPC Class Codes: Y10S 428/902 High modulus filament or fiber
• CPC Class Codes: Y10T 428/2913 Rod, strand, filament or fiber

Abstract

Stretched filaments of high strength and high modulus being made of polyethylene of a weight average molecular weight of not less than 3×10⁶ and having a strength of not less than 50 g/d and an initial modulus of not less than 1,500 g/d, the long period structure being substantially not observed, which are prepared by spinning a dilute solution of said polyethylene and stretching the resultant gel-like filaments in multi-stages until the long period structure becomes substantially not observed.

Claims

1. Stretched polyethylene filaments of high strength and high modulus, characterized by being made of polyethylene of a weight average molecular weight of not less than 3×

10⁶, a strength of not less than 50 g/d, an initial modulus of not less than 1,500 g/d, and no observable long period spacing.

2. The filaments according to claim 1, wherein the strength is not less than 60 g/d and the initial modulus is not less than 2,000 g/a.