# US 8,541,510 B2 · Thermosetting composition

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- Number: US 8,541,510 B2
- Document ID: US8541510B2
- Status: Granted
- Kind: B2
- Application number: 13/120,834
- Filed: 2009-09-25
- Published: 2011-09-15
- Granted: 2013-09-24
- Earliest claimed: 2008-09-25
- Assignees: Bridgestone Corporation
- Applicants: Hajime Kitano; Shuyou Akama
- Inventors: Hajime Kitano; Shuyou Akama
- Web page: https://patentgrep.com/patent/US8541510B2

## CPC

- C08K 5/37: Thiols
- C08C 19/20: Incorporating sulfur atoms into the molecule
- C08K 5/0025: {Crosslinking or vulcanising agents; including accelerators}
- C08K 5/378: containing heterocyclic rings
- C08K 5/14: Peroxides
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)
- C08C: TREATMENT OR CHEMICAL MODIFICATION OF RUBBERS

## Abstract

This invention relates to a thermosetting composition having an excellent thermosetting property, and more particularly to a thermosetting composition comprising (A) a diene-based polymer having two or more unsaturated bonds, (B) a polythiol derived from a mercaptocarboxylic acid, and (c) a thermally radical-generating agent.

## Claims

### Claim 1

A thermosetting composition comprising (A) a diene-based polymer having two or more unsaturated bonds, (B) a polythiol derived from mercaptocarboxylic acid and (C) a thermally radical-generating agent, wherein said diene-based polymer (A) is a liquid styrene-butadiene copolymer having a bound styrene content of 15-90 mass % and a vinyl bond content in butadiene portion of 20-90% or a liquid polyisoprene having hydroxy group(s) in one terminal or both terminals, and
said thermally radical-generating agent (C) is at least one selected from the group consisting of organic peroxides and azobis series compounds.

### Claim 2 (depends on 1)

A thermosetting composition according to claim 1, wherein said diene-based polymer (A) is a liquid at 25° C.

### Claim 3 (depends on 1)

A thermosetting composition according to claim 1, wherein said diene-based polymer is a polymer synthesized from a diene-based monomer, or a copolymer synthesized from a diene-based monomer and maleic anhydride and/or styrene monomer.

### Claim 4 (depends on 1)

A thermosetting composition according to claim 1, wherein said diene-based polymer (A) has a number average molecular weight of 1500-40000.

### Claim 5 (depends on 1)

A thermosetting composition according to claim 1, wherein said diene-based polymer (A) is a liquid styrene-butadiene copolymer having a bound styrene content of 15-90 mass % and a vinyl bond content in butadiene portion of 20-90%.

### Claim 6 (depends on 5)

A thermosetting composition according to claim 5, wherein said liquid styrene-butadiene copolymer has hydroxy group(s) in one terminal or both terminals.

### Claim 7 (depends on 1)

A thermosetting composition according to claim 1, wherein said diene-based polymer (A) is a liquid polyisoprene having hydroxy group(s) in one terminal or both terminals.

### Claim 8 (depends on 1)

A thermosetting composition according to claim 1, wherein said polythiol (B) is at least one selected from the group consisting of tetraethylene glycol bis(3-mercaptopropionate), trimethylolpropane tris(3-mercaptopropionate), tris[(3-mercaptopropionyloxy)-ethyl]isocyanurate, pentaerythritol tetrakis(3-mercaptopropionate), dipentaerythritol hexakis(3-mercaptopropionate), 1,4-bis(3-mercaptobutylyloxy)butane, pentaerythritol tetrakis(3-mercaptobutyrate) and 1,3,5-tris(3-mercaptobutyloxyethyl)-1,3,5-triazine-2,4,6(1H,3H,5H)-trion.

### Claim 9 (depends on 1)

A thermosetting composition according to claim 1, wherein the composition is liquid at 25° C.