Method for manufacturing poly(ethyleneterephthalate) drawn fiber, poly(ethyleneterephthalate) drawn fiber and tire-cord

Patent metadata

Field	Value
Publication number	US-9359696-B2
Application number	US-201214233438-A
Country	US
Kind code	B2
Filing date	Sep 25, 2012
Priority date	Sep 27, 2011
Publication date	Jun 7, 2016
Grant date	Jun 7, 2016

Abstract

Disclosed are a method for manufacturing a drawn fiber, which is suitable for manufacturing a poly(ethylene terephthalate) drawn fiber showing superior strength and dimensional stability and having a high fineness of 2000 denier or more without breakage or reduction in physical properties during the manufacturing process, and a poly(ethylene terephthalate) drawn fiber and a tire-cord obtained therefrom.

First claim

The invention claimed is:

1. A method for manufacturing a poly(ethylene terephthalate) drawn fiber, comprising the steps of:
adding a polyamide-based resin to a polymer including 90 mol % or more of poly(ethylene terephthalate), wherein the polyamide-base resin is added in an amount of 0.1 to 2.0 wt % based on the weight of the poly(ethylene terephthalate);
melt-spinning the polyamide-based resin-added polymer mixture through a spinneret at a speed of 2500 to 4000 m/min in a three- or four-ply spinning manner so as to produce an undrawn fiber having a fineness of 2000 denier or more; and
drawing the undrawn fiber with a drawing ratio of 1.4 to 2.4,
wherein the polymer including 90 mol % or more of poly(ethylene terephthalate) has an intrinsic viscosity of 0.8 to 1.5, and
wherein the polyamide-based resin includes nylon 6 or nylon 66.

2. The method according to claim 1 , wherein the melt-spinning process is performed under a spinning tension of 0.3 to 0.8 g/d.

3. The method according to claim 1 , wherein the undrawn fiber has crystallinity of 10 to 30% and coefficient of variation of 8% or less in the sectional area.

Assignees

• Kolon Inc

Inventors

• Park Sung-Ho
• Chung Il
• Kim Gi-Woong

Classifications

• D02J1/22 Primary

  Stretching or tensioning, shrinking or relaxing, e.g. by use of overfeed and underfeed apparatus, or preventing stretch (stretch spinning D01D5/12) · CPC title

• D01F6/62 Primary

  from polyesters · CPC title

• D01D5/098

  with simultaneous stretching · CPC title

• D01D5/12

  Stretch-spinning methods ({D01D5/098 takes precedence} finishing by stretching D02J1/22) · CPC title

• D01D5/08

  Melt spinning methods {(D01D5/0023 takes precedence)} · CPC title