Conjugated diene polymer and modified conjugated diene polymer produced using the same, rubber composition for tire, and rubber composition for rubber belt

Patent metadata

Field	Value
Publication number	US-10508163-B2
Application number	US-201715801872-A
Country	US
Kind code	B2
Filing date	Nov 2, 2017
Priority date	Mar 13, 2013
Publication date	Dec 17, 2019
Grant date	Dec 17, 2019

Abstract

A conjugated diene polymer having a high content of cis-1,4-structures with a high activity, a conjugated diene polymer and a modified conjugated diene polymer using the same, a rubber composition for a tire, and a rubber composition for a rubber belt. Described are a catalyst for a conjugated diene polymerization including: a non-metallocene type gadolinium compound (A) represented by the general formula (1); an ionic compound (B) formed of a non-coordinating anion and a cation; and an organic metal compound (C) of an element selected from the group consisting of a group 2, a group 12, and a group 13 of the periodic table, a conjugated diene polymer and a modified conjugated diene polymer obtained using the same, a rubber composition for a tire, and a rubber composition for a rubber belt.

First claim

The invention claimed is:

1. A conjugated diene polymer composition comprising:
a conjugated diene polymer (a) resulting from a polymerization of a conjugated diene compound using a catalyst for a conjugated diene polymerization including a non-metallocene type gadolinium compound (A) represented by the following general formula (1), an ionic compound (B) formed of a non-coordinating anion and a cation, and an organic metal compound (C) of an element selected from the group consisting of a group 2, a group 12, and a group 13 of the periodic table, the conjugated diene polymer (α) containing 95.1% or more of a cis-1,4 structure;
a diene polymer (β) other than the (α); and
a rubber-reinforcing agent (γ),

wherein R 1 , R 2 , and R 3 each shows hydrogen or a substituent having 1 to 12 carbon atoms, O shows an oxygen atom, and Gd shows a gadolinium atom.

2. The conjugated diene polymer composition according to claim 1 , wherein the rubber-reinforcing agent (γ) is a carbon black.

3. The conjugated diene polymer composition according to claim 1 , wherein the molecular weight of the conjugated diene compound is adjusted with a compound selected from the group consisting of (1) hydrogen, (2) a metal hydride compound, and (3) a hydrogenated organic metal compound.

4. The conjugated diene polymer composition according to claim 1 , wherein the conjugated diene compound is a 1,3-butadiene.

5. The conjugated diene polymer composition according to claim 1 , which is a rubber composition for a tire, wherein the rubber-reinforcing agent (γ) is included in an amount of 30 to 80 parts by mass based on 100 parts by mass of the rubber components (α)+(β).

6. The conjugated diene polymer composition according to claim 5 , wherein the diene polymer (β) is a natural rubber and/or a polyisoprene.

7. The conjugated diene polymer composition according to claim 5 , wherein the rubber-reinforcing agent (γ) is a carbon black.

8. The conjugated diene polymer composition according to claim 1 , which is a rubber composition for a rubber belt, wherein the rubber-reinforcing agent (γ) is included in an amount of 20 to 70 parts by mass based on 100 parts by mass of the rubber components (α)+(β).

9. The conjugated diene polymer composition according to claim 8 , wherein the rubber-reinforcing agent (γ) is a carbon black and/or silica.

10. A modified conjugated diene polymer obtained by polymerizing a conjugated diene compound using a catalyst for a conjugated diene polymerization including a non-metallocene type gadolinium compound (A) represented by the following general formula (1), a ionic compound (B) formed of a non-coordinating anion and a cation, and an organic metal compound (C) of an element selected from the group consisting of a group 2, a group 12, and a group 13 of the periodic table, to form a conjugated diene polymer containing 95.1% or more of a cis-1,4 structure, and then modifying the resulting polymer with a modifier,

wherein R 1 , R 2 , and R 3 each shows hydrogen or a substituent having 1 to 12 carbon atoms, O shows an oxygen atom, and Gd shows a gadolinium atom.

11. The modified conjugated diene polymer according to claim 10 , wherein the modifier is one member selected from the group consisting of an amino group-containing carbonyl compound, a halogenated benzyl compound, and an aldehyde compound.

12. A modified conjugated diene polymer composition comprising:
a modified conjugated diene polymer (α′) according to claim 10 ;
a diene polymer (β) other than the (a′); and
a rubber-reinforcing agent (γ).

13. The modified conjugated diene polymer composition according to claim 12 wherein the molecular weight of the conjugated diene compound is adjusted with a compound selected from the group consisting of (1) hydrogen, (2) a metal hydride compound, and (3) a hydrogenated organic metal compound.

14. The modified conjugated diene polymer composition according to claim 12 wherein the conjugated diene compound is a 1,3-butadiene.

15. The modified conjugated diene polymer composition according to claim 12 , which is a rubber composition for a tire, wherein the rubber-reinforcing agent (γ) is included in an amount of 30 to 80 parts by mass based on 100 parts by mass of the rubber components (α′)+(β).

16. The modified conjugated diene polymer composition according to claim 15 , wherein the diene polymer (β) is a natural rubber and/or a polyisoprene.

17. The modified conjugated diene polymer composition according to claim 12 , which is a rubber composition for a rubber belt, wherein the rubber-reinforcing agent (γ) is included in an amount of 20 to 70 parts by mass based on 100 parts by mass of the rubber components (α′)+(β).

18. The modified conjugated diene polymer composition according to claim 17 , wherein the rubber-reinforcing agent (γ) is a carbon black and/or silica.

19. A tire comprising the modified conjugated diene polymer composition according to claim 15 as a rubber substrate.

20. A rubber belt comprising the modified conjugated diene polymer composition according to claim 17 as a rubber substrate.

Assignees

• Ube Industries

Inventors

• Shiba Koji
• Murakami Masato
• Suzuki Michinori
• Okamoto Naomi
• Anbe Mitsuharu
• Tanaka Masahiro

Classifications

• C08C19/12

  Incorporating halogen atoms into the molecule · CPC title

• C08K3/045

  Fullerenes · CPC title

• C08F8/00

  Chemical modification by after-treatment (graft polymers, block polymers, crosslinking with unsaturated monomers or with polymers C08F251/00 - C08F299/00; of conjugated diene rubbers C08C) · CPC title

• C08L47/00

  Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds; Compositions of derivatives of such polymers (C08L45/00 takes precedence; of conjugated diene rubbers C08L9/00 - C08L21/00) · CPC title

• C08F36/04

  conjugated · CPC title