Crosslinkable fluorine rubber composition, fluorine rubber molded article, and method for producing same

Patent metadata

Field	Value
Publication number	US-9102817-B2
Application number	US-201214241267-A
Country	US
Kind code	B2
Filing date	Aug 6, 2012
Priority date	Sep 30, 2011
Publication date	Aug 11, 2015
Grant date	Aug 11, 2015

Abstract

A crosslinkable fluororubber composition containing: a fluororubber (A); and a fluororesin (B), wherein the fluororesin (B) is a copolymer (B1) consisting of tetrafluoroethylene units (a) and hexafluoropropylene units (b) or a copolymer (B2) containing tetrafluoroethylene units (a), hexafluoropropylene units (b), and polymerized units (c) derived from a monomer copolymerizable with tetrafluoroethylene and hexafluoropropylene, the copolymer (B1) satisfies the condition that the ratio (a)/(b) is (80.0 to 87.3)/(12.7 to 20.0) on a molar basis, and the copolymer (B2) satisfies the condition that the ratio (a)/(b) is (80.0 to 90.0)/(10.0 to 20.0) on a molar basis, and the ratio (c)/{(a)+(b)} is (0.1 to 10.0)/(90.0 to 99.9) on a molar basis.

First claim

The invention claimed is:

1. A crosslinkable fluororubber composition comprising:
a fluororubber (A); and
a fluororesin (B),
wherein the fluororesin (B) is a copolymer (B1) consisting of tetrafluoroethylene units (a) and hexafluoropropylene units (b) or a copolymer (B2) comprising tetrafluoroethylene units (a), hexafluoropropylene units (b), and polymerized units (c) derived from a monomer copolymerizable with tetrafluoroethylene and hexafluoropropylene,
the copolymer (B1) satisfies the condition that the ratio (a)/(b) is (80.0 to 87.3)/(12.7 to 20.0) on a molar basis, and
the copolymer (B2) satisfies the condition that the ratio (a)/(b) is (80.0 to 90.0)/(10.0 to 20.0) on a molar basis, and the ratio (c)/{(a)+(b)} is (0.1 to 10.0)/(90.0 to 99.9) on a molar basis,
wherein the fluororesin (B) has a storage elastic modulus (E′), as determined by a viscoelasticity analysis at 70° C., of 10 to 160 MPa.

2. The crosslinkable fluororubber composition according to claim 1 ,
wherein the crosslinkable fluororubber composition comprises co-coagulated powder comprising a co-coagulation of the fluororubber (A) and the fluororesin (B), and
the fluororesin (B) is the copolymer (B1).

3. The crosslinkable fluororubber composition according to claim 1 ,
wherein the crosslinkable fluororubber composition comprises co-coagulated powder comprising a co-coagulation of the fluororubber (A) and the fluororesin (B), and
the fluororesin (B) is the copolymer (B2).

4. The crosslinkable fluororubber composition according to claim 1 ,
wherein the polymerized units (c) of the fluororesin (B) are units derived from a perfluoro(alkyl vinyl ether).

5. The crosslinkable fluororubber composition according to claim 1 ,
wherein the fluororesin (B) has a melting point of not higher than 210° C.

6. The crosslinkable fluororubber composition according to claim 1 ,
wherein the fluororubber (A) is at least one selected from the group consisting of vinylidene fluoride/hexafluoropropylene copolymers, vinylidene fluoride/hexafluoropropylene/tetrafluoroethylene copolymers, tetrafluoroethylene/propylene copolymers, tetrafluoroethylene/propylene/vinylidene fluoride copolymers, ethylene/hexafluoropropylene copolymers, ethylene/hexafluoropropylene/vinylidene fluoride copolymers, ethylene/hexafluoropropylene/tetrafluoroethylene copolymers, vinylidene fluoride/tetrafluoroethylene/perfluoro(alkyl vinyl ether) copolymers, and vinylidene fluoride/chlorotrifluoroethylene copolymers.

7. The crosslinkable fluororubber composition according to claim 1 ,
wherein the fluororubber (A) comprises copolymerized units derived from a crosslinking-site-imparting monomer.

8. A fluororubber molded article comprising a crosslinked crosslinkable fluororubber composition according to claim 1 .

9. A method for producing a fluororubber molded article, comprising the steps of:
(I) co-coagulating a fluororubber (A) and a fluororesin (B), thereby providing co-coagulated powder, and then preparing a crosslinkable fluororubber composition according to claim 1 ;
(II) molding and crosslinking the crosslinkable fluororubber composition, thereby providing a crosslinked molded article; and
(III) heating the crosslinked molded article to a temperature of not lower than the melting point of the fluororesin (B), thereby providing a fluororubber molded article.

10. A fluororubber molded article obtained by the production method according to claim 9 .

11. The fluororubber molded article according to claim 8 ,
wherein the fluororubber molded article is a sealing material.

12. The fluororubber molded article according to claim 8 ,
wherein the fluororubber molded article is a sliding member.

13. The fluororubber molded article according to claim 8 ,
wherein the fluororubber molded article is a non-stick member.

14. The fluororubber molded article according to claim 8 ,
wherein the fluororubber molded article has a water/oil repellent surface.

Assignees

• Nakano Yasuhiro
• Yanagiguchi Tomihiko
• Kitahara Takahiro
• Daikin Ind Ltd

Inventors

• Nakano Yasuhiro
• Yanagiguchi Tomihiko
• Kitahara Takahiro

Classifications

• C08J2327/18

  Homopolymers or copolymers of tetrafluoroethylene · CPC title

• C08L2312/00

  Crosslinking · CPC title

• C08J3/246

  Intercrosslinking of at least two polymers · CPC title

• C08L2205/025

  containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure · CPC title

• C08J2327/12

  containing fluorine atoms · CPC title