Fluorinated copolymer composition, crosslinked rubber and method for its production

Patent metadata

Field	Value
Publication number	US-12264238-B2
Application number	US-202117411227-A
Country	US
Kind code	B2
Filing date	Aug 25, 2021
Priority date	Mar 8, 2019
Publication date	Apr 1, 2025
Grant date	Apr 1, 2025

Abstract

To provide a method for producing crosslinked rubber excellent in hardness and transparency.
The method for producing crosslinked rubber of the present invention is a method for producing crosslinked rubber, which comprises crosslinking a fluorinated copolymer in a composition comprising the fluorinated copolymer, a crosslinking agent and a crosslinking co-agent, wherein the fluorinated copolymer is a copolymer having units based on tetrafluoroethylene and units based on a perfluoro(alkyl vinyl ether), the content of the units based on tetrafluoroethylene is from 65 to 90 mol % to all units of the fluorinated copolymer, in the composition, the content of the crosslinking agent is from 0.03 to 0.7 part by mass to 100 parts by mass of the fluorinated copolymer, the content of the crosslinking co-agent is from 0.1 to 2.5 parts by mass to 100 parts by mass of the fluorinated copolymer, and the hardness is from 65 to 100.

First claim

What is claimed is:

1. A fluorinated copolymer composition, comprising:
a crosslinking agent;
a crosslinking co-agent; and
a fluorinated copolymer having units based on tetrafluoroethylene, units based on a perfluoro (alkyl vinyl ether), and units based on formula (2), (CR 1 R 2 ═CR 3 ) a R 4 where each of R 1 , R 2 and R 3 independently is a hydrogen atom, a fluorine atom or a methyl group, a represents an integer of from 2 to 6, and R 4 is an a-valent C 1-10 perfluorohydrocarbon group or a group having an etheric oxygen atom at a terminal or between carbon-carbon atoms of the perfluorohydrocarbon group,
wherein in the fluorinated copolymer, a content of the units based on tetrafluoroethylene is from 69 to 90 mol % based on a total number of moles of units of the fluorinated copolymer, a content of the crosslinking agent is from 0.03 to 0.7 part by mass to 100 parts by mass of the fluorinated copolymer, a content of the crosslinking co-agent is from 0.1 to 2.5 parts by mass to 100 parts by mass of the fluorinated copolymer, and a content of the units based on the formula (2) is from 0.03 to 0.5 mol % based on a total number of moles of units of the fluorinated copolymer.

2. The fluorinated copolymer composition according to claim 1 , wherein a mass ratio of the content of the crosslinking agent to the content of the crosslinking co-agent is from 0.4 to 7.

3. The fluorinated copolymer composition according to claim 1 , wherein a total of the contents of the crosslinking agent and the crosslinking co-agent is at most 2.0 parts by mass to 100 parts by mass of the fluorinated copolymer.

4. The fluorinated copolymer composition according to claim 1 , wherein a total of contents of components other than the fluorinated copolymer is from 0.5 to 2.0 parts by mass to 100 parts by mass of the fluorinated copolymer.

5. The fluorinated copolymer composition according to claim 1 , wherein the fluorinated copolymer comprises iodine atoms, and a mass ratio of a content of iodine atoms to the content of the crosslinking co-agent is from 0.3 to 1.2.

6. The fluorinated copolymer composition according to claim 5 , wherein a total of the contents of the crosslinking agent and the crosslinking co-agent is at most 2.0 parts by mass to 100 parts by mass of the fluorinated copolymer.

7. The fluorinated copolymer composition according to claim 1 , wherein the fluorinated copolymer comprises iodine atoms, and a mass ratio of a content of iodine atoms to the content of the crosslinking agent is from 0.3 to 1.2.

8. The fluorinated copolymer composition according to claim 7 , wherein the fluorinated copolymer comprises iodine atoms, and a mass ratio of a content of iodine atoms to the content of the crosslinking co-agent is from 0.3 to 1.2.

9. The fluorinated copolymer composition according to claim 7 , wherein a mass ratio of the content of the crosslinking agent to the content of the crosslinking co-agent is from 0.4 to 7.

10. The fluorinated copolymer composition according to claim 7 , wherein a total of the contents of the crosslinking agent and the crosslinking co-agent is at most 2.0 parts by mass to 100 parts by mass of the fluorinated copolymer.

11. The fluorinated copolymer composition according to claim 7 , wherein a total of contents of components other than the fluorinated copolymer is from 0.5 to 2.0 parts by mass to 100 parts by mass of the fluorinated copolymer.

12. A crosslinked rubber, comprising:
the fluorinated copolymer composition of claim 1 crosslinked.

Assignees

• Agc Inc

Inventors

• Hattori Yukiko
• Kawai Tsuyoshi
• Yamada Takeshi
• Kose Takehiro

Classifications

• C08L21/02

  Latex · CPC title

• C08J2327/18

  Homopolymers or copolymers of tetrafluoroethylene · CPC title

• C08J2321/02

  Latex · CPC title

• C08J3/246

  Intercrosslinking of at least two polymers · CPC title

• C08F214/262 Primary

  with fluorinated vinyl ethers · CPC title