# US 8,785,581 B2 · Fluoroelastomer, curable composition and cured rubber article

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- Number: US 8,785,581 B2
- Document ID: US8785581B2
- Status: Granted
- Kind: B2
- Application number: 13/913,282
- Filed: 2013-06-07
- Published: 2013-10-17
- Granted: 2014-07-22
- Earliest claimed: 2009-03-05
- Assignees: Daikin Industries, Ltd.
- Applicants: Daikin Industries, Ltd.
- Inventors: Shigeru Morita; Masanori Kitaichi; Shouji Fukuoka; Daisuke Ota
- Web page: https://patentgrep.com/patent/US8785581B2

## CPC

- C08F 214/22: Vinylidene fluoride
- C08K 5/0025: {Crosslinking or vulcanising agents; including accelerators}
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)

## Abstract

A noncrystalline fluoroelastomer which is a copolymer consisting essentially of vinylidene fluoride and a fluoromonomer represented by the general formula (1): CH2═CFRf (1) wherein Rf is a straight or branched fluoroalkyl group containing 1 to 12 carbon atoms, and has a vinylidene fluoride units/fluoromonomer units mol ratio of 78/22 to 22/78 and a glass transition temperature of not higher than 25° C.

## Claims

### Claim 1

A noncrystalline fluoroelastomer which is a copolymer
consisting essentially of vinylidene fluoride, a fluoromonomer represented by the general formula (I):
CH2═CFRf (1)
wherein Rf is a straight or branched fluoroalkyl group containing 1 to 12 carbon atoms, and another monomer copolymerizable with both vinylidene fluoride and said fluoromonomer of formula (I), and
has a vinylidene fluoride units/fluoromonomer units mol ratio of 85/15 to 20/80,
contains the other monomer units in the amount of 1 to 40 mol percent of all the monomer units and
has a glass transition temperature of not higher than 25° C.

### Claim 2 (depends on 1)

The fluoroelastomer according to claim 1,
wherein the vinylidene fluoride units/fluoromonomer units mol ratio is 85/15 to 50/50.

### Claim 3 (depends on 1)

The fluoroelastomer according to claim 1,
wherein the fluoromonomer is 2,3,3,3-tetrafluoropropene.

### Claim 4 (depends on 1)

A curable composition comprising the fluoroelastomer according to claim 1 and a curing agent.

### Claim 5 (depends on 4)

A cured rubber article obtained by curing the curable composition according to claim 4.