Modified conjugated diene-based polymer and rubber composition including the same

Patent metadata

Field	Value
Publication number	US-11339238-B2
Application number	US-201716475525-A
Country	US
Kind code	B2
Filing date	Dec 8, 2017
Priority date	Jan 3, 2017
Publication date	May 24, 2022
Grant date	May 24, 2022

Abstract

A modified conjugated diene-based polymer, and more particularly, a modified conjugated diene-based polymer having a unimodal molecular weight distribution curve measured by gel permeation chromatography (GPC), molecular weight distribution (PDI; MWD) of less than 1.7, and a Si content of 100 ppm or more based on weight, and a rubber composition including the same.

First claim

The invention claimed is:

1. A modified conjugated diene-based polymer having:
a unimodal molecular weight distribution curve measured by gel permeation chromatography (GPC),
a molecular weight distribution (PDI; MWD) of 1.0 or more and less than 1.7, and
a Si content of 100 ppm or more based on a total weight of the modified conjugated diene-based polymer,
wherein the modified conjugated diene-based polymer is a homopolymer comprising a repeat unit derived from a conjugated diene-based monomer.

2. The modified conjugated diene-based polymer of claim 1 , further comprising a repeating unit derived from a conjugated diene-based monomer and a functional group derived from a modifier.

3. The modified conjugated diene-based polymer of claim 2 , wherein the modifier is an alkoxysilane-based modifier.

4. The modified conjugated diene-based polymer of claim 1 , wherein the modified conjugated diene-based polymer has a number average molecular weight (Mn) of 1,000 g/mol to 2,000,000 g/mol, and a weight average molecular weight (Mw) of 1,000 g/mol to 3,000,000 g/mol.

5. The modified conjugated diene-based polymer of claim 1 , wherein a Mooney viscosity is 30 or more at 100° C.

6. A rubber composition comprising the modified conjugated diene-based polymer according to claim 1 , and a filler.

7. The rubber composition of claim 6 , wherein the rubber composition comprises 0.1 parts by weight to 200 parts by weight of the filler based on 100 parts by weight of the modified conjugated diene-based polymer.

8. The rubber composition of claim 6 , wherein the filler is a silica-based filler or a carbon black-based filler.

9. The rubber composition of claim 6 , wherein a Mooney viscosity is from 59 to 74 at 100° C.

10. A method for preparing the modified conjugated diene-based polymer of claim 1 comprising:
(S1) polymerizing a conjugated diene-based monomer, or an aromatic vinyl-based monomer and a conjugated diene-based monomer, in a hydrocarbon solvent including an organometallic compound to prepare an active polymer; and
(S2) reacting the active polymer prepared in (S1) with a modifier,
wherein the active polymer is coupled with an organometal,
the step (S1) is continuously performed in two or more polymerization reactors, and
a polymerization conversion ratio in a first polymerization reactor is 50% or less.

11. The method of claim 10 , wherein the polymerization of step (S1) is conducted in a temperature range of 80° C. or less.

Assignees

• Lg Chern Ltd
• Lg Chemical Ltd

Inventors

• Lee Ho Young
• Son Ki Seok
• Chai Da Won
• Kim No Ma
• Kim Sun Keun
• Na Youk Reol
• Lee Hyoung Woo
• Choi Heung Yeal

Classifications

• C08K3/36

  Silica · CPC title

• C08L15/00 Primary

  Compositions of rubber derivatives (C08L11/00, C08L13/00 take precedence) · CPC title

• C08K3/013

  Fillers, pigments or reinforcing additives · CPC title

• C08F2800/20

  as weight or mass percentages · CPC title

• B60C1/00

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