High-tenacity polyethylene fiber

• US 5,443,904 A
• Filed: 12/14/1994
• Issued: 08/22/1995
• Est. Priority Date: 12/16/1993
• Status: Expired due to Term

• Current Assignee: Toyoda Gosei Company Limited (Toyota Motor Corporation)
• Original Assignee: Toyoda Gosei Company Limited (Toyota Motor Corporation)
• Inventors: Ohta, Yasuo, Kuroki, Tadao, Oie, Yoshinobu
• Primary Examiner(s): EDWARDS, NEWTON O
• Application Number:
  US08/355,910
• Time in Patent Office: 251 Days
• Field of Search: 428/364, 428/394
• US Class Current: 428/364
• CPC Class Codes: C08F 110/02 Ethene
• CPC Class Codes: C08F 2500/10 Short chain branches
• CPC Class Codes: C08F 2500/17 Viscosity
• CPC Class Codes: D01F 6/04 from polyolefins
• CPC Class Codes: Y10T 428/2913 Rod, strand, filament or fiber
• CPC Class Codes: Y10T 428/2967 Synthetic resin or polymer

Abstract

There is disclosed a high-tenacity polyethylene fiber containing an ethylene component as a main repeating unit, the fiber exhibiting an intrinsic viscosity [η_B ] of at least 7 and having a tenacity of at least 30 g/d and an elastic modulus of at least 900 g/d; the peak value of loss tangent in the γ-dispersion being 0.025 to 0.06 and the peak temperature of loss modulus in the a-dispersion being 85° C. or higher, as determined by measurement of temperature dispersion of viscoelastic properties of the fiber. Also disclosed is a process of producing such a high-tenacity polyethylene fiber.

Claims

1. A high-tenacity polyethylene fiber comprising an ethylene component as a main repeating unit, the fiber exhibiting an intrinsic viscosity [η

_B ] of at least 7 and having a tenacity of at least 30 g/d and an elastic modulus of at least 900 g/d;

the peak value of loss tangent in the γ

-dispersion being 0.025 to 0.06 and the peak temperature of loss modulus in the α

-dispersion being 85°

C. or higher, as determined by measurement of temperature dispersion of viscoelastic properties of the fiber.

2. A polyethylene fiber according to claim 1, wherein the intrinsic viscosity [η

_B ] of the fiber is at least 11.

3. A polyethylene fiber according to claim 2, wherein the intrinsic viscosity [η

_B ] of the fiber is at least 13.

5. A polyethylene fiber according to claim 1, wherein the elastic modulus of the fiber is at least 1200 g/d.

6. A polyethylene fiber according to claim 1, wherein the peak value of loss tangent in the γ

-dispersion is 0.030 to 0.05.

7. A polyethylene fiber according to claim 6, wherein the peak value of loss tangent in the γ

-dispersion is 0.035 to 0.05.

8. A polyethylene fiber according to claim 1, wherein the peak temperature of loss modulus in the α

-dispersion is 90°

C. or higher.

9. A polyethylene fiber according to claim 8, wherein the peak temperature of loss modulus in the α

-dispersion is 95°

C. or higher.

4. A polyethylene fiber according to claim I, wherein the tenacity of the fiber is at least 38 g/d.