# US 12,180,369 B2 · Rubber composition and organosilicon compound

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- Number: US 12,180,369 B2
- Document ID: US12180369B2
- Status: Granted
- Kind: B2
- Application number: 17/430,913
- Filed: 2020-01-23
- Published: 2022-06-02
- Granted: 2024-12-31
- Earliest claimed: 2019-02-15
- Assignees: Shin-Etsu Chemical Co., Ltd.
- Applicants: Shin-Etsu Chemical Co., Ltd.
- Inventors: Munenao Hirokami; Tsuneo Kimura; Masahiko Minemura; Tsutomu Nakamura; Masaki Tanaka; Satoru Uno; Masashi Yano
- Web page: https://patentgrep.com/patent/US12180369B2

## CPC

- B60C 1/00: Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition
- C08L 9/06: Copolymers with styrene
- B60C 1/0016: {Compositions of the tread}
- B60C 11/0008: {characterised by the tread rubber}
- C08C 19/25: Incorporating silicon atoms into the molecule
- C08F 136/06: Butadiene
- B60C 2011/0025: {Modulus or tan delta}
- C08L 2205/02: containing two or more polymers of the same C08L -group
- Y02T 10/86: Optimisation of rolling resistance, e.g. weight reduction
- B60C: VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- C08C: TREATMENT OR CHEMICAL MODIFICATION OF RUBBERS
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

A rubber composition which contains (A) an organosilicon compound represented by formula (1) and gives a cured object satisfying desired fuel (or power)-saving tire properties. (R1 represents an alkyl or aryl group, R2 represents an alkyl or aryl group, e, f, and g each indicate a number larger than 0 and satisfy g/(e+f+g)<0.05, and m is an integer of 1-3.)

## Claims

### Claim 1

A rubber composition comprising (A) an organosilicon compound, (B) a diene rubber, (C) a filler, and (D) a sulfur-containing organosilicon compound; (A) the organosilicon compound having the formula (1):
wherein R1 is each independently a C1-C10 alkyl group or C6-C10 aryl group, R2 is each independently a C1-C10 alkyl group or C6-C10 aryl group, e, f, and g e and f are each independently a number of 1 to 500, g is a number of 0.1 to 10, g/(e+f+g) is a number of 0.01 or more and less than 0.05, (f+g)/(e+f+g) is a number of 0.28 or more and up to 0.6, and m is an integer of 1 to 3, with the proviso that the arrangement of individual repeat units is arbitrary.

### Claim 2 (depends on 1)

The rubber composition of claim 1 wherein the organosilicon compound (A) has a number average molecular weight of up to 100,000.

### Claim 3 (depends on 1)

The rubber composition of claim 1 wherein the filler (C) is silica.

### Claim 4 (depends on 1)

The rubber composition of claim 1 wherein the organosilicon compound (A) has a number average molecular weight of 800 to 4,800.

### Claim 5 (depends on 1)

The rubber composition of claim 1 wherein the organosilicon compound (A) is in a liquid form.

### Claim 6 (depends on 1)

A tire obtained by molding the rubber composition of claim 1.

### Claim 7

An organosilicon compound having the formula (1):
wherein R1 is each independently a C1-C10 alkyl group or C6-C10 aryl group, R2 is each independently a C1-C10 alkyl group or C6-C10 aryl group, e and f are each independently a number of 1 to 500, g is a number of 0.1 to 10, g/(e+f+g) is a number of 0.01 or more and less than 0.05, (f+g)/(e+f+g) is a number of 0.28 or more and up to 0.6, and m is an integer of 1 to 3, with the proviso that the arrangement of individual repeat units is arbitrary.

### Claim 8 (depends on 7)

The organosilicon compound of claim 7 which has a number average molecular weight of 800 to 4,800.

### Claim 9 (depends on 7)

The organosilicon compound of claim 7 which is in a liquid form.