Fluorinated elastomer composition and method for its production, molded product, cross-linked product, and covered electric wire

Patent metadata

Field	Value
Publication number	US-9701828-B2
Application number	US-201615070098-A
Country	US
Kind code	B2
Filing date	Mar 15, 2016
Priority date	Sep 25, 2013
Publication date	Jul 11, 2017
Grant date	Jul 11, 2017

Abstract

To provide a fluorinated elastomer composition which is excellent in heat discoloration resistance and moldability, and a molded product, cross-linked product and covered electric wire, using such a fluorinated elastomer composition.
A fluorinated elastomer composition comprising a fluorinated rubber (a) and a fluorinated copolymer (b), wherein the fluorinated copolymer (b) has units (A) derived from tetrafluoroethylene and units (B) derived from ethylene in a molar ratio [(A)/(B)] of the units (A) to the units (B) of from 25/75 to 80/20; the fluorinated copolymer (b) has a crystallization temperature of from 100 to 210° C. and a melt flow rate of from 0.1 to 1,000 g/10 min.; and the mass ratio [(a)/(b)] of the fluorinated rubber (a) to the fluorinated copolymer (b) is from 80/20 to 20/80.

First claim

What is claimed is:

1. A fluorinated elastomer composition comprising a fluorinated rubber (a) and a fluorinated copolymer (b), wherein
the fluorinated copolymer (b) has units (A) derived from tetrafluoroethylene and units (B) derived from ethylene in a molar ratio [(A)/(B)] of the units (A) to the units (B) of from 25/75 to 80/20,
the fluorinated copolymer (b) has a crystallization temperature of from 100 to 210° C. and a melt flow rate of from 0.1 to 1,000 g/10 min., and
the mass ratio [(a)/(b)] of the fluorinated rubber (a) to the fluorinated copolymer (b) is from 80/20 to 20/80.

2. The fluorinated elastomer composition according to claim 1 , wherein the fluorinated rubber (a) is a copolymer comprising from 35 to 70 mol % of units derived from tetrafluoroethylene, from 20 to 55 mol % of units derived from propylene, and from 0 to 40 mol % of units derived from other monomer.

3. The fluorinated elastomer composition according to claim 1 , wherein the fluorinated copolymer (b) further contains units (C) derived from CH 2 ═CH(CF 2 ) Q F (wherein Q is an integer of from 2 to 10), in a molar ratio [(A)/(C)] of the units (A) to the units (C) of from 85/15 to 99.9/0.1.

4. The fluorinated elastomer composition according to claim 3 , wherein the fluorinated copolymer (b) further contains units (D) derived from other monomer, in a molar ratio [(A)/(D)] of the units (A) to the units (D) of from 70/30 to 99.9/0.1.

5. The fluorinated elastomer composition according to claim 4 , wherein the units (D) contains units derived from hexafluoropropylene.

6. The fluorinated elastomer composition according to claim 1 , which further contains an ethylene copolymer (c) containing epoxy groups, in a mass ratio [(b)/(c)] of the fluorinated copolymer (b) to the ethylene copolymer (c) containing epoxy groups of from 100/0.1 to 100/10.

7. A method for producing the fluorinated elastomer composition as defined in claim 1 , which comprises a step of kneading a material containing the fluorinated rubber (a) and the fluorinated copolymer (b) under a heating condition of from 100 to 240° C.

8. The method for producing the fluorinated elastomer composition according to claim 7 , wherein the kneading step is a step of kneading the mixture by an extruder for from 1 to 30 minutes.

9. A molded product obtained by molding the fluorinated elastomer composition as defined in claim 1 .

10. A cross-linked product obtained by cross-linking the fluorinated elastomer composition as defined in claim 1 .

11. A covered electric wire comprising a conductor and a covering material for covering the conductor, wherein the covering material is the fluorinated elastomer composition as defined in claim 1 .

12. A covered electric wire comprising a conductor and a covering material for covering the conductor, wherein the covering material is the cross-linked product as defined in claim 10 .

Assignees

• Asahi Glass Co Ltd

Inventors

• Taguchi Daisuke
• Yasuda Satoko
• Sato Takashi

Classifications

• C09D127/18

  Homopolymers or copolymers of tetrafluoroethene · CPC title

• C08J2327/18

  Homopolymers or copolymers of tetrafluoroethylene · CPC title

• C08L27/20 Primary

  Homopolymers or copolymers of hexafluoropropene · CPC title

• H01B3/44

  vinyl resins; acrylic resins (silicones H01B3/46) · CPC title

• C08L2205/02

  containing two or more polymers of the same C08L -group · CPC title