Rubber composition

Patent metadata

Field	Value
Publication number	US-11597828-B2
Application number	US-201916628472-A
Country	US
Kind code	B2
Filing date	Apr 10, 2019
Priority date	May 17, 2018
Publication date	Mar 7, 2023
Grant date	Mar 7, 2023

Abstract

The present invention relates to a rubber composition having excellent abrasion resistance and improved tensile properties and viscoelasticity properties by controlling compatibility among rubber components, and a tire manufactured using the same.

First claim

The invention claimed is:

1. A rubber composition comprising:
a first synthetic rubber;
a second synthetic rubber: and
a filler,
wherein a solubility parameter difference between the first synthetic rubber and the second synthetic rubber is greater than 0.8 and less than or equal to 1.1,
the first synthetic rubber is a solution-polymerized modified conjugated diene-based rubber which has a styrene bond content of 38 wt % or more, and 55 wt % or less, and has a first functional group bonded to at both terminals, and
the second synthetic rubber is a lithium-catalyzed modified butadiene-based rubber in which a second functional group is bonded to at least one terminal.

2. The rubber composition according to claim 1 , wherein the second synthetic rubber has a vinyl bond content in a polymer of 50 wt % or less.

3. The rubber composition according to claim 1 , wherein the rubber composition comprises 30 parts by weight to 90 parts by weight of the first synthetic rubber; 10 parts by weight to 70 parts by weight of the second synthetic rubber; and 30 parts by weight to 200 parts by weight of the filler, based on 100 parts by weight of a rubber component comprising the first synthetic rubber and the second synthetic rubber.

4. The rubber composition according to claim 1 , wherein the filler is silica or carbon black.

5. The rubber composition according to claim 1 , wherein the rubber composition further comprises a vulcanizing agent.

6. The rubber composition according to claim 1 , wherein the rubber composition further comprises one or more additives selected from a vulcanization accelerator, a process oil or an antiaging agent.

7. A tire comprising the rubber composition according to claim 1 .

8. The rubber composition according to claim 1 , wherein the first synthetic rubber comprises 60 wt % to 80 wt % of a repeating unit derived from a conjugated diene-based monomer and 20 wt % to 40 wt % of a repeating unit derived from an aromatic vinyl-based monomer.

9. The rubber composition according to claim 1 , wherein the first synthetic rubber comprises an extender oil in an amount of greater than 0 wt % and less than or equal to 37.5 wt %.

10. The rubber composition according to claim 1 , wherein the first functional group in the first synthetic rubber is an amine group, an aminoalkoxysilane group, or a combination thereof.

11. The rubber composition according to claim 1 , wherein the first synthetic rubber comprises a repeating unit derived from a conjugated diene-based monomer selected from 1,3-butadiene, isoprene, 1,3-pentadiene, 1,3-hexadiene, 2,3-dimethyl-1,3-butadiene, 2-ethyl-1,3-butadiene, 2-methyl-1,3-pentadiene, 3-methyl-1,3-pentadiene, 4-methyl-1,3-pentadiene, or 2,4-hexadiene.

12. The rubber composition according to claim 1 , wherein the first synthetic rubber comprises a repeating unit derived from an aromatic vinyl monomer selected from styrene, α-methylstyrene, 3-methylstyrene, 4-methylstyrene, 4-propylstyrene, 1-vinylnaphthalene, 4-cyclohexylstyrene, 4-(p-methylphenyl)styrene, or 1-vinyl-5-hexylnaphthalene.

13. The rubber composition according to claim 1 , wherein the first synthetic rubber has a number average molecular weight (Mn) of 20,000 g/mol to 800,000 g/mol, a weight average molecular weight (Mw) of 40,000 g/mol to 2,000,000 g/mol, and molecular weight distribution (Mw/Mn) of 1.0 to 4.0.

14. The rubber composition according to claim 1 , wherein the second synthetic rubber has a number average molecular weight (Mn) of 20,000 g/mol to 800,000 g/mol, and a weight average molecular weight (Mw) of 40,000 g/mol to 2,000,000 g/mol.

Assignees

• Lg Chemical Ltd

Inventors

• Na Youk Reol
• Choi Jae Sun
• Kim No Ma
• Kim Jin Young
• Kim Yu Jin
• Jun Jae Moon

Classifications

• C08F2/04

  Polymerisation in solution (C08F2/32 takes precedence) · CPC title

• C08F236/08

  Isoprene · CPC title

• C08F4/48

  selected from lithium, rubidium, caesium or francium {(C08F4/461 takes precedence)} · CPC title

• Y02T10/86

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

• C08L9/06

  Copolymers with styrene · CPC title