# US 12,215,219 B2 · Resin composition, molded article, and automatic transmission

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- Number: US 12,215,219 B2
- Document ID: US12215219B2
- Status: Granted
- Kind: B2
- Application number: 17/582,749
- Filed: 2022-01-24
- Published: 2022-06-16
- Granted: 2025-02-04
- Earliest claimed: 2019-07-25
- Assignees: Daikin Industries, Ltd.
- Applicants: Daikin Industries, Ltd.
- Inventors: Keisuke Hagi; Tomihiko Yanagiguchi; Yuma Osafune; Ryo Inoue; Takuma Maruhashi; Kazuya Kawahara
- Web page: https://patentgrep.com/patent/US12215219B2

## CPC

- C08L 27/18: Homopolymers or copolymers or tetrafluoroethene
- C08K 3/04: Carbon
- C08K 3/042: {Graphene or derivatives, e.g. graphene oxides}
- C08K 3/34: Silicon-containing compounds
- C08K 3/346: {Clay}
- C08K 7/06: Elements
- C08K 7/14: Glass
- C09K 3/10: {Materials in mouldable or extrudable form} for sealing or packing joints or covers (filling pastes C09D5/34)
- F16J 9/28: of non-metals
- F16J 15/20: Packing materials therefor
- F16J 15/3284: characterised by their structure; Selection of materials
- C08K 2201/005: Additives being defined by their particle size in general
- C08K 2201/014: Additives containing two or more different additives of the same subgroup in C08K
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- F16J: PISTONS {(specially adapted for dampers F16F9/32)}; CYLINDERS; SEALINGS

## Abstract

A resin composition including polytetrafluoroethylene (A); graphite (B); talc (C); and an abrasion resistance-improving filler (D), the resin composition containing 50 to 80 parts by mass of the polytetrafluoroethylene (A), 1 to 35 parts by mass of the graphite (B), 1 to 35 parts by mass of the talc (C), 16 to 40 parts by mass of a total of the graphite (B) and the talc (C), and 2 to 10 parts by mass of the abrasion resistance-improving filler (D) relative to 100 parts by mass of a total of the polytetrafluoroethylene (A), the graphite (B), the talc (C), and the abrasion resistance-improving filler (D). Also disclosed is a molded article obtained by compression molding, extrusion molding, or injection molding the resin composition.

## Claims

### Claim 1

A resin composition comprising:
polytetrafluoroethylene (A);
graphite (B);
talc (C); and
an abrasion resistance-improving filler (D),
the resin composition containing 50 to 80 parts by mass of the polytetrafluoroethylene (A), 1 to 35 parts by mass of the graphite (B), 1 to 80 parts by mass of the talc (C), 16 to 40 parts by mass of a total of the graphite (B) and the talc (C), and 2 to 10 parts by mass of the abrasion resistance-improving filler (D) relative to 100 parts by mass of a total of the polytetrafluoroethylene (A), the graphite (B), the talc (C), and the abrasion resistance-improving filler (D).

### Claim 2 (depends on 1)

The resin composition according to claim 1,
wherein the polytetrafluoroethylene (A) is molding powder having an average particle size of 5 to 100 μm.

### Claim 3 (depends on 1)

The resin composition according to claim 1,
wherein the polytetrafluoroethylene (A) is a modified polytetrafluoroethylene.

### Claim 4 (depends on 1)

The resin composition according to claim 1,
wherein the graphite (B) has a crystallite size in a c-axis direction of 200 Å or greater.

### Claim 5 (depends on 1)

The resin composition according to claim 1,
wherein the graphite (B) is anisotropic graphite having a Mohs hardness of 2 or less.

### Claim 6 (depends on 1)

The resin composition according to claim 1,
wherein the graphite (B) is flake graphite having a thickness of 1 μm or smaller.

### Claim 7 (depends on 1)

The resin composition according to claim 1,
wherein the talc (C) contains 0.6 to 18% by mass of an Al2O3 component and 0.6 to 5.0% by mass of an Fe2O3 component.

### Claim 8 (depends on 1)

The resin composition according to claim 1,
wherein the abrasion resistance-improving filler (D) includes at least one selected from the group consisting of coke, carbon fibers, silicon dioxide, and glass fibers.

### Claim 9 (depends on 1)

The resin composition according to claim 1, intended for a sliding material.

### Claim 10 (depends on 1)

A molded article obtained by compression molding, extrusion molding, or injection molding the resin composition according to claim 1.

### Claim 11 (depends on 10)

The molded article according to claim 10,
wherein the molded article has a dynamic coefficient of friction of 0.2 or less.

### Claim 12 (depends on 10)

The molded article according to claim 10, intended for a seal ring.

### Claim 13 (depends on 12)

An automatic transmission comprising the molded article according to claim 12.