# US 10,766,304 B2 · Polyamide-based thermoplastic elastomer and tire

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- Number: US 10,766,304 B2
- Document ID: US10766304B2
- Status: Granted
- Kind: B2
- Application number: 15/564,046
- Filed: 2016-04-06
- Published: 2018-03-29
- Granted: 2020-09-08
- Earliest claimed: 2015-04-10
- Assignees: Bridgestone Corporation
- Applicants: Bridgestone Corporation
- Inventors: Yasunori Tarutani
- Web page: https://patentgrep.com/patent/US10766304B2

## CPC

- B60C 1/00: Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition
- B60C 5/01: without substantial cord reinforcement, e.g. cordless tyres, cast tyres
- C08G 69/26: derived from polyamines and polycarboxylic acids
- C08G 69/40: Polyamides containing oxygen in the form of ether groups (C08G69/12, C08G69/32 take precedence)
- C08K 7/02: Fibres or whiskers
- C08L 77/06: Polyamides derived from polyamines and polycarboxylic acids (C08L77/10 takes precedence)
- C08J 2300/22: Thermoplastic resins
- C08J 2300/26: Elastomers
- B60C: VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON 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)
- C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29)

## Abstract

A polyamide-based thermoplastic elastomer including a hard segment and a soft segment, wherein the hard segment contains polyamide 612 and the soft segment contains a polyamine.

## Claims

### Claim 1

A tire comprising a polyamide-based thermoplastic elastomer comprising a hard segment and a soft segment, wherein the hard segment contains polyamide 612, and the soft segment contains an ABA-type triblock polyether diamine represented by the following Formula (N):
wherein, in Formula (N), XN and ZN each independently represent an integer from 1 to 20, and YN represents an integer from 4 to 50.

### Claim 2 (depends on 1)

The tire according to claim 1, wherein a mass ratio (HS/SS) of the hard segment (HS) to the soft segment (SS) is from 30/70 to 85/15.

### Claim 3 (depends on 2)

The tire according to claim 2, the polyamide 612 comprising a DDA-derived portion represented by (OC—(CH2)10—CO), derived from dodecanedioic acid (DDA), and an HMDA-derived portion represented by (HN—(CH2)6—NH), derived from hexamethylene diamine (HMDA), wherein a molar ratio (DDA-derived portion/HMDA-derived portion) of the DDA-derived portion to the HMDA-derived portion is from 73/27 to 52/48.

### Claim 4 (depends on 2)

The tire according to claim 2, the polyamide-based thermoplastic elastomer having a weight average molecular weight of from 20,000 to 250,000.

### Claim 5 (depends on 1)

The tire according to claim 1, the polyamide 612 comprising a DDA-derived portion represented by (OC—(CH2)10—CO), derived from dodecanedioic acid (DDA), and an HMDA-derived portion represented by (HN—(CH2)6—NH), derived from hexamethylene diamine (HMDA), wherein a molar ratio (DDA-derived portion/HMDA-derived portion) of the DDA-derived portion to the HMDA-derived portion is from 73/27 to 52/48.

### Claim 6 (depends on 5)

The tire according to claim 5, the polyamide-based thermoplastic elastomer having a weight average molecular weight of from 20,000 to 250,000.

### Claim 7 (depends on 1)

The tire according to claim 1, the polyamide-based thermoplastic elastomer having a weight average molecular weight of from 20,000 to 250,000.

### Claim 8 (depends on 1)

The tire according to claim 1, comprising at least a circular tire frame, wherein the tire frame is formed of a resin composition including the polyamide-based thermoplastic elastomer.

### Claim 9 (depends on 1)

The tire according to claim 1, comprising at least a circular tire frame and a reinforcing cord layer, wherein the reinforcing cord layer is formed of a reinforcing cord member and a resin composition, the reinforcing cord member is wound in a circumferential direction around an outer peripheral portion of the tire frame, and the resin composition contains the polyamide-based thermoplastic elastomer.

### Claim 10 (depends on 1)

The tire according to claim 1, comprising at least a rubber member formed of a rubber composition containing a diene rubber and a resin member formed of a resin composition containing the polyamide-based thermoplastic elastomer, wherein the rubber member is adhered to the resin member via a layer formed of a composition containing a resorcinol-formalin-latex-based adhesive.

### Claim 11 (depends on 10)

The tire according to claim 10, wherein the resin member is a circular tire frame.