Heavy-duty tire rubber compositions and tires

Patent metadata

Field	Value
Publication number	US-11590799-B2
Application number	US-201816643160-A
Country	US
Kind code	B2
Filing date	Aug 29, 2018
Priority date	Sep 1, 2017
Publication date	Feb 28, 2023
Grant date	Feb 28, 2023

Abstract

The invention provides a heavy-duty tire rubber composition excellent in wet grip performance and steering stability, and a tire tread, a bead filler, a tire belt and a heavy-duty tire which each partially include the composition. The heavy-duty tire rubber composition includes 100 parts by mass of a solid rubber (A), 0.1 to 50 parts by mass of a modified liquid diene rubber (B) having a functional group derived from a silane compound with a specific structure, and 20 to 200 parts by mass of a filler (C), the modified liquid diene rubber (B) satisfying the following (i) and (ii): (i) the weight average molecular weight (Mw) is not less than 1,000 and not more than 120,000, and (ii) the vinyl content is not less than 30 mol % and less than 70 mol %.

First claim

The invention claimed is:

1. A heavy-duty tire rubber composition, comprising:
100 parts by mass of a solid rubber (A),
0.1 to 50 parts by mass of a modified liquid diene rubber (B), the modified liquid diene rubber (B) comprising a functional group derived from a silane compound, and
20 to 200 parts by mass of a filler (C),
wherein the solid rubber (A) comprises 60 mass % or more of a natural rubber, and
wherein the modified liquid diene rubber (B) satisfies the following conditions (i) and (ii):
(i) a weight average molecular weight is not less than 1,000 and not more than 120,000, and
(ii) a vinyl content is not less than 30 mol % and less than 70 mol %, and

the silane compound is a compound of formula (1):

wherein R 1 is a C 1-6 divalent alkylene group, and R 2 , R 3 and R 4 are each independently a methoxy group, an ethoxy group, a phenoxy group, a methyl group, an ethyl group or a phenyl group, wherein at least one of R 2 , R 3 and R 4 is a methoxy group, an ethoxy group or a phenoxy group.

2. The heavy-duty tire rubber composition according to claim 1 , wherein a melt viscosity of the modified liquid diene rubber (B) at 38° C. is 0.1 to 4,000 Pa·s.

3. The heavy-duty tire rubber composition according to claim 1 , wherein the modified liquid diene rubber (B) is a polymer comprising a monomer unit derived from isoprene and/or butadiene.

4. The heavy-duty tire rubber composition according to claim 1 , wherein the filler (C) is at least one selected from the group consisting of a silica and a carbon black.

5. The heavy-duty tire rubber composition according to claim 4 ,
wherein the filler (C) is a carbon black having an average particle diameter of 5 to 100 nm and/or a silica having an average particle diameter of 0.5 to 200 nm.

6. The heavy-duty tire rubber composition according to claim 4 ,
wherein the filler (C) is silica, and
the heavy-duty tire rubber composition further comprises:
0.1 to 30 parts by mass of a silane coupling agent per 100 parts by mass of the silica.

7. The heavy-duty tire rubber composition according to claim 1 , wherein the solid rubber (A) is one or more selected from the group consisting of a natural rubber, a styrene butadiene rubber, a butadiene rubber and an isoprene rubber.

8. A crosslinked product, obtained by crosslinking the heavy-duty tire rubber composition described in claim 1 .

9. A tire tread, comprising:
the heavy-duty tire rubber composition described in claim 1 .

10. A bead filler, comprising:
the heavy-duty tire rubber composition described in claim 1 .

11. A tire belt, comprising:
the heavy-duty tire rubber composition described in claim 1 .

12. A heavy-duty tire, comprising:
the heavy-duty tire rubber composition described in claim 1 .

Assignees

• Kuraray Co

Inventors

• Koda Daisuke
• Kanbara Hiroshi

Classifications

• Y02T10/86

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

• C08K2201/003

  Additives being defined by their diameter · CPC title

• B60C2200/06

  for heavy duty vehicles · CPC title

• C08F236/06

  Butadiene · CPC title

• C08K3/04

  Carbon · CPC title