# US 12,180,315 B2 · Elastomer composition and sealing material

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- Number: US 12,180,315 B2
- Document ID: US12180315B2
- Status: Granted
- Kind: B2
- Application number: 17/299,231
- Filed: 2019-12-02
- Published: 2022-02-10
- Granted: 2024-12-31
- Earliest claimed: 2018-12-04
- Assignees: Valqua, Ltd.
- Applicants: Valqua, Ltd.
- Inventors: Naoki Osumi; Hirohisa Imada; Tomomitsu Mochizuki
- Web page: https://patentgrep.com/patent/US12180315B2

## CPC

- C08F 216/1408: {Monomers containing halogen}
- C08F 214/262: {with fluorinated vinyl ethers}
- C08K 5/14: Peroxides
- C08L 27/18: Homopolymers or copolymers or tetrafluoroethene
- C09K 3/1009: {Fluorinated polymers, e.g. PTFE}
- F16J 15/102: {characterised by material}
- C08K 5/34924: {containing cyanurate groups; Tautomers thereof}
- C08L 2205/02: containing two or more polymers of the same C08L -group
- C08L 2205/025: containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
- 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)
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- F16J: PISTONS {(specially adapted for dampers F16F9/32)}; CYLINDERS; SEALINGS

## Abstract

Provided are an elastomer composition including a first fluoroelastomer that is a copolymer of tetrafluoroethylene and perfluoro (alkoxyvinyl ether) and a second fluoroelastomer different from the first fluoroelastomer, and a sealing material including a crosslinked product of the elastomer composition.

## Claims

### Claim 1

An elastomer composition consisting of:
a first fluoroelastomer being a copolymer containing a constituent unit derived from tetrafluoroethylene, one or more constituent units derived from perfluoro (alkoxyvinyl ether), and a constituent derived from a crosslinking site monomer;
a second fluoroelastomer different from the first fluoroelastomer, a peroxide crosslinking agent and a co-crosslinking agent, and a filler, or consisting of two or more of the first fluoroelastomers, the peroxide crosslinking agent and the co-crosslinking agent, and the filler,
wherein the second fluoroelastomer is a perfluoroelastomer, and the second fluoroelastomer is a copolymer containing the constituent unit derived from tetrafluoroethylene, one or more constituent units derived from perfluoro (alkyl vinyl ether), and a constituent unit derived from a crosslinking site monomer,
wherein the co-crosslinking agent is triallyl isocyanurate, and
wherein the first fluoroelastomer and the second fluoroelastomer are contained in a mass ratio of 10:90 to 90:10.

### Claim 2 (depends on 1)

A sealing material comprising a crosslinked product of the elastomer composition according to claim 1.