Modified conjugated diene-based polymer, rubber composition, tire, and method of producing modified conjugated diene-based polymer

Patent metadata

Field	Value
Publication number	US-11655321-B2
Application number	US-201816640798-A
Country	US
Kind code	B2
Filing date	Aug 31, 2018
Priority date	Sep 1, 2017
Publication date	May 23, 2023
Grant date	May 23, 2023

Abstract

Provided is a modified conjugated diene-based polymer, a rubber composition and a tire with excellent low loss property and durability, and a method of producing a modified conjugated diene-based polymer with which the presently disclosed modified conjugated diene-based polymer can be produced. The modified conjugated diene-based polymer has two or more modifying groups in one modified conjugated diene-based polymer molecule, where the modifying groups between molecules have a non-covalent bond with energy of 10 kJ/mol to 250 kJ/mol. The rubber composition contains the modified conjugated diene-based polymer. The tire uses the rubber composition. The method of producing a modified conjugated diene-based polymer includes (i) anionically polymerizing at least a conjugated diene compound in presence of an alkali metal compound to form a conjugated diene-based polymer, (ii) further adding an alkali metal compound to the conjugated diene-based polymer, and (iii) reacting the product obtained in (ii) with a modifying agent to introduce a modifying group into the conjugated diene-based polymer.

First claim

The invention claimed is:

1. A modified conjugated diene-based polymer having 3 to 30 modifying groups in one molecule of the modified conjugated diene-based polymer, wherein the modifying groups between molecules have a non-covalent bond, and energy for one non-covalent bond is 10 kJ/mol to 250 kJ/mol;
wherein the modifying group is at least one selected from the group consisting of —COOM and —OM, and M is an alkali metal atom; and
wherein the modified conjugated diene-based polymer has a weight-average molecular weight of 100,000 or more.

2. The modified conjugated diene-based polymer according to claim 1 , wherein the modifying group is at least one selected from the group consisting of —COOLi and —OLi.

3. The modified conjugated diene-based polymer according to claim 1 , wherein the modified conjugated diene-based polymer is at least one selected from the group consisting of a modified styrene-butadiene copolymer and a modified polybutadiene.

4. A rubber composition comprising the modified conjugated diene-based polymer according to claim 1 .

5. The rubber composition according to claim 4 , further comprising a filler.

6. A tire using the rubber composition according to claim 4 .

7. A method of producing the modified conjugated diene-based polymer of claim 1 , the method comprising:
(i) anionically polymerizing a conjugated diene compound alone or a conjugated diene compound and an aromatic vinyl compound in presence of an alkali metal compound as a polymerization initiator to form a conjugated diene-based polymer,
(ii) further adding an alkali metal compound to the conjugated diene-based polymer after (i) to obtain a product, and
(iii) reacting the product obtained in (ii) with a modifying agent to introduce a modifying group into the conjugated diene-based polymer.

8. The method of producing a modified conjugated diene-based polymer according to claim 7 , wherein the aromatic vinyl compound includes styrene and at least one selected from the group consisting of alkylstyrene and halogenated alkylstyrene.

9. The method of producing a modified conjugated diene-based polymer according to claim 8 , wherein a total content of the at least one selected from the group consisting of alkylstyrene and halogenated alkylstyrene is 0.1 mass % to 3 mass % with respect to a monomer forming the conjugated diene-based polymer.

10. The method of producing a modified conjugated diene-based polymer according to claim 8 , wherein the alkylstyrene is 4-methylstyrene, and the halogenated alkylstyrene is 4-chloromethyl styrene.

11. The method of producing a modified conjugated diene-based polymer according to claim 7 , wherein the modifying agent is carbon dioxide.

12. The method of producing a modified conjugated diene-based polymer according to claim 8 , wherein the modifying agent is carbon dioxide.

13. The modified conjugated diene-based polymer according to claim 2 , wherein the modified conjugated diene-based polymer is at least one selected from the group consisting of a modified styrene-butadiene copolymer and a modified polybutadiene.

Assignees

• Bridgestone Corp

Inventors

• Tanaka Takatsugu
• Fukushima Rika

Classifications

• B60C1/00

  Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition · CPC title

• C08K3/04

  Carbon · CPC title

• Y02T10/86

  Optimisation of rolling resistance, e.g. weight reduction · CPC title

• C08C19/44 Primary

  of polymers containing metal atoms exclusively at one or both ends of the skeleton · CPC title

• C08C19/26

  Incorporating metal atoms into the molecule · CPC title