# US 2020/0399451 A1 · Sealing member

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 2020/0399451 A1
- Document ID: US20200399451A1
- Status: Published application
- Kind: A1
- Application number: 16/895,310
- Filed: 2020-06-08
- Published: 2020-12-24
- Earliest claimed: 2019-06-19
- Assignees: Jtekt Corporation
- Applicants: Jtekt Corporation
- Inventors: Yuji KAWANO
- Web page: https://patentgrep.com/patent/US20200399451A1

## CPC

- C08L 13/00: Compositions of rubbers containing carboxyl groups
- F16J 15/3284: characterised by their structure; Selection of materials
- C08K 3/36: Silica
- C08K 7/14: Glass
- F16J 15/3208: provided with tension elements, e.g. elastic rings
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- F16J: PISTONS {(specially adapted for dampers F16F9/32)}; CYLINDERS; SEALINGS
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)

## Abstract

A sealing member includes a sliding portion made of a vulcanized rubber composition. The rubber composition includes a carboxyl-containing acrylic rubber, a silica, and a glass fiber. A content of the silica is 25 to 100 parts by weight per 100 parts by weight of the carboxyl-containing acrylic rubber.

## Claims

### Claim 1

A sealing member, comprising:
a sliding portion made of a vulcanized rubber composition, wherein:
the rubber composition includes a carboxyl-containing acrylic rubber, a silica, and a glass fiber; and
a content of the silica is 25 to 100 parts by weight per 100 parts by weight of the carboxyl-containing acrylic rubber.

### Claim 2 (depends on 1)

The sealing member according claim 1, wherein a pH of the silica is 8 or more and 12 or less.

### Claim 3 (depends on 1)

The sealing member according to claim 1, wherein a pH of the silica is 10 or more and 12 or less.

### Claim 4 (depends on 1)

The sealing member according to claim 1, wherein in the rubber composition, a content of the glass fiber is 20 to 40 parts by weight per 100 parts by weight of the carboxyl-containing acrylic rubber.

### Claim 5 (depends on 2)

The sealing member according to claim 2, wherein in the rubber composition, a content of the glass fiber is 20 to 40 parts by weight per 100 parts by weight of the carboxyl-containing acrylic rubber.

### Claim 6 (depends on 3)

The sealing member according to claim 3, wherein in the rubber composition, a content of the glass fiber is 20 to 40 parts by weight per 100 parts by weight of the carboxyl-containing acrylic rubber.

### Claim 7 (depends on 1)

The sealing member according to claim 1, wherein a content of the silica is 30 to 80 parts by weight per 100 parts by weight of the carboxyl-containing acrylic rubber.

### Claim 8 (depends on 1)

The sealing member according to claim 1, wherein a content of the silica is 45 to 65 parts by weight per 100 parts by weight of the carboxyl-containing acrylic rubber.