Rubber composition manufacturing method and pneumatic tire

Patent metadata

Field	Value
Publication number	US-2017292007-A1
Application number	US-201715482848-A
Country	US
Kind code	A1
Filing date	Apr 10, 2017
Priority date	Apr 11, 2016
Publication date	Oct 12, 2017
Grant date	—

Abstract

A method for manufacturing a rubber composition includes kneading a rubber component, an inorganic filler and a thioester-based silane coupling agent, and adding a vulcanizing agent and one or more compounds selected from the group of an imide compound and an N-oxyl compound to a mixture of the rubber component, the inorganic filler, and the thioester-based silane coupling agent such that the vulcanizing agent and the imide compound and/or the N-oxyl compound are kneaded with the mixture including the rubber component, the inorganic filler, and the thioester-based silane coupling agent.

First claim

What is claimed is:

1 . A method for manufacturing a rubber composition, comprising:
kneading a rubber component, an inorganic filler and a thioester-based silane coupling agent; and adding a vulcanizing agent and at least one compound selected from the group consisting of an imide compound and an N-oxyl compound to a mixture of the rubber component, the inorganic filler, and the thioester-based silane coupling agent such that the vulcanizing agent and the imide compound and/or the N-oxyl compound are kneaded with the mixture comprising the rubber component, the inorganic filler, and the thioester-based silane coupling agent.

2 . The method of claim 1 , wherein the thioester-based silane coupling agent is a compound of formula (S1)

where R 1001 is a monovalent group selected from —Cl, —Br, —OR1006, —O (O═) CR 1006 , —ON═CR 1006 R 1007 , —ON═CR 1006 R 1007 , —NR 1006 R 1007 and —(OSiR 1006 R 1007 ) h (OSiR 1006 R 1007 R 1008 ) where R 1006 , R 1007 and R 1008 are same or different and are each a hydrogen atom or a monovalent hydrocarbon group having 1 to 18 carbon atoms, and h has an average value of 1 to 4, R 1002 is R 1001 , a hydrogen atom or a monovalent hydrocarbon group having 1 to 18 carbon atoms, R 1003 is R 1001 , R 1002 , a hydrogen atom or a —[O(R 1009 O) j ] 0.5 — group where R 1009 is an alkylene group having 1 to 18 carbon atoms, and j is an integer of 1 to 4, R 1004 is a divalent hydrocarbon group having 1 to 18 carbon atoms, R 1005 is a monovalent hydrocarbon group having 1 to 18 carbon atoms, and x, y and z are numbers satisfying the relations, x+y+2z=3, 0≦x≦3, 0≦y≦2, 0≦z≦1.

3 . The method of claim 1 , wherein the imide compound is a compound of formula (I)

where R 11 represents a hydrogen atom, a hydroxyl group, or an organic group, R 12 and R 13 are same or different and each represent a hydrogen atom or an organic group, and R 12 and R 13 are or are not bonded to each other to form a ring structure.

4 . The method of claim 1 , wherein the N-oxyl compound is at least one compound selected from the group consisting of a compound of formula (II-1)

where R 1 to R 4 are same or different and each represent an alkyl group having 1 to 4 carbon atoms, a compound of formula (II-2)

where R 5 represents a linear or branched carbon chain having 4 or less carbon atoms, a compound of formula (II-3)

where R 6 represents a linear or branched carbon chain having 4 or less carbon atoms, a compound of formula (II-4)

where R 7 represents a linear or branched carbon chain having 4 or less carbon atoms, a compound of formula (II-5)

and a compound of formula (II-6)

where R 8 and R 9 are same or different and each represent a hydrogen atom or a linear or branched alkyl group having 1 to 6 carbon atoms.

5 . The method of claim 1 , wherein the inorganic filler is silica.

6 . The method of claim 1 , wherein the vulcanizing agent and the imide compound and/or the N-oxyl compound are kneaded with the mixture comprising the rubber component, the inorganic filler, and the thioester-based silane coupling agent at a discharge temperature of 120° C. or less.

7 . A pneumatic tire formed from a rubber composition obtained by the method of claim 1 .

8 . The method of claim 2 , wherein the imide compound is a compound of formula (I)

where R 11 represents a hydrogen atom, a hydroxyl group, or an organic group, R 12 and R 13 are same or different and each represent a hydrogen atom or an organic group, and R 12 and R 13 are or are not bonded to each other to form a ring structure.

9 . The method of claim 2 , wherein the N-oxyl compound is at least one compound selected from the group consisting of a compound of formula (II-1)

where R 1 to R 4 are same or different and each represent an alkyl group having 1 to 4 carbon atoms, a compound of formula (II-2)

where R 5 represents a linear or branched carbon chain having 4 or less carbon atoms, a compound of formula (II-3)

where R 6 represents a linear or branched carbon chain having 4 or less carbon atoms, a compound of formula (II-4)

where R 7 represents a linear or branched carbon chain having 4 or less carbon atoms, a compound of formula (II-5)

and a compound of formula (II-6)

where R 8 and R 9 are same or different and each represent a hydrogen atom or a linear or branched alkyl group having 1 to 6 carbon atoms.

10 . The method of claim 2 , wherein the inorganic filler is silica.

11 . The method of claim 2 , wherein the vulcanizing agent and the imide compound and/or the N-oxyl compound are kneaded with the mixture comprising the rubber component, the inorganic filler, and the thioester-based silane coupling agent at a discharge temperature of 120° C. or less.

12 . A pneumatic tire formed from a rubber composition obtained by the method of claim 2 .

13 . The method of claim 3 , wherein the N-oxyl compound is at least one compound selected from the group consisting of a compound of formula (II-1)

where R 1 to R 4 are same or different and each represent an alkyl group having 1 to 4 carbon atoms, a compound of formula (II-2)

where R 5 represents a linear or branched carbon chain having 4 or less carbon atoms, a compound of formula (II-3)

where R 6 represents a linear or branched carbon chain having 4 or less carbon atoms, a compound of formula (II-4)

where R 7 represents a linear or branched carbon chain having 4 or less carbon atoms, a compound of formula (II-5)

and a compound of formula (II-6)

Assignees

• Sumitomo Rubber Ind

Inventors

• Kitago Ryota
• BITO Yasumasa
• Tokimune Ryuichi

Classifications

• B29K2009/06

  SB polymers, i.e. butadiene-styrene polymers · CPC title

• B29B7/002

  Methods (chemical aspects C08J3/00) · CPC title

• C08J3/24

  Crosslinking, e.g. vulcanising, of macromolecules (mechanical aspects B29C35/00; crosslinking agents C08K) · CPC title

• C08K5/3435

  Piperidines · CPC title

• C08J2309/06

  Copolymers with styrene · CPC title