Polyetherimide-based fiber, method for manufacturing same, and fiber structure containing same

Patent metadata

Field	Value
Publication number	US-10683589-B2
Application number	US-201715468151-A
Country	US
Kind code	B2
Filing date	Mar 24, 2017
Priority date	Sep 29, 2014
Publication date	Jun 16, 2020
Grant date	Jun 16, 2020

Abstract

Where T1 denotes a temperature (Tg−15° C.) that is 15° C. lower than the glass transition point (glass transition temperature) of the polyetherimide resin, and T2 denotes a temperature (Tg+25° C.) that is 25° C. higher than the glass transition point.

First claim

What is claimed is:

1. A polyetherimide-based fiber containing a polyetherimide resin and carbon black dispersed in the resin, wherein the fiber has a content of the carbon black of from 0.03 wt % to 0.4 wt %; the carbon black has a primary particle number-mean particle size of from 30 nm to 500 nm; the fiber has a weight reduction rate of less than 0.5% around the glass transition point (Tg) of the polyetherimide resin, where the weight reduction rate is defined by the following formula (1):
weight reduction rate (%)={[(fiber weight at temperature T 1)−(fiber weight at temperature T 2)]/(fiber weight at temperature T 1)}×100  (1)

where T1 denotes a temperature (Tg−15° C.) that is 15° C. lower than the glass transition point (glass transition temperature) of the polyetherimide resin, and T2 denotes a temperature (Tg+25° C.) that is 25° C. higher than the glass transition point, wherein the weight reduction rate is determined by a thermogravimetric/differential thermal analysis system (TG-DTA), the glass transition point (Tg) is determined by differential scanning calorimetry (DSC), and
the carbon black satisfies a ratio D/A of 100 or more, where “D” denotes primary particle number-mean particle size of the carbon black as “D nanometer” and “A” denotes the content of carbon black in the fiber as “A wt %”.

2. The polyetherimide-based fiber according to claim 1 , wherein the carbon black satisfies the ratio D/A of 400 or more.

3. A fiber structure containing a polyetherimide-based fiber recited in claim 1 , wherein the fiber structure comprises a sheet-shaped material formed from a monolayer or a plurality of layers, contains equal to or more than 30 wt % of the polyetherimide-based fiber, and contains the carbon black at a content from 0.2 to 7.0 g/m 2 .

4. The fiber structure according to claim 3 , which has a form of a fabric.

5. A method for producing the polyetherimide-based fiber as recited in claim 1 , the method comprising:
kneading carbon black into a polyetherimide resin to give a carbon black-kneaded resin, and
melt-spinning the carbon black-kneaded resin to form a fiber.

6. The polyetherimide-based fiber according to claim 1 , wherein a single fiber fineness of the polyetherimide-based fiber is from 0.1 dtex to 10 dtex.

Assignees

• Kuraray Co

Inventors

• Okamoto Tetsuya
• Uehata Akihiro
• Katsuya Satoshi

Classifications

• D01D1/02

  Preparation of spinning solutions · CPC title

• D04H1/46

  by needling or like operations to cause entanglement of fibres (D04H1/45 takes precedence; needling machines D04H18/00) · CPC title

• D04H1/4326

  Condensation or reaction polymers · CPC title

• D10B2331/06

  polyethers · CPC title

• D01F6/78 Primary

  from copolycondensation products · CPC title