Sumitomo Chemical Company, Limited

Yasuo Uekita

Orhan Ozturk

Yosuke Watanabe

Hiroshi Shiratani

Masahito Sekiguchi

Kazumasa Matsuo

Kenichi Takeuchi

A rubber composition comprising a compound having one or more groups represented by formula (X) and a rubber component is provided. wherein ring Wrepresents a cyclic group having at least one selected from the group consisting of &#x2014;C(&#x2550;O)&#x2014; and &#x2014;C(&#x2550;S)&#x2014;; Nrepresents a nitrogen atom; the at least one selected from the group consisting of &#x2014;C(&#x2550;O)&#x2014; and &#x2014;C(&#x2550;S)&#x2014; in the ring Wand Nare conjugated; and Zrepresents &#x2014;O&#x2014; or &#x2014;S&#x2014;.

Rubber composition and vulcanization aid

A process for producing particles, the process including pulverizing particles of a compound represented by formula (I) with a median diameter (50% D) of over 100 &#x3bc;m by using a pulverizer in the presence of at least one member selected from the group consisting of silica, talc and clay, to obtain particles of the compound represented by formula (I) with a median diameter (50% D) of 100 &#x3bc;m or less, in formula (I), Rand Reach independently represent a hydrogen atom or an alkyl group having 1 to 6 carbon atoms, or alternatively, Rand Rare inked to each other to form a ring together with the nitrogen atom to which they are bound, m represents an integer of 2 to 9, Mrepresents Hor an n-valent metal ion, and n represents an integer of 1 or 2.

Process for producing particles

A rubber composition comprising a hydrate of a compound represented by formula (I-2) or a salt thereof; or a methanol solvate of a compound represented by formula (I) or a salt thereof. 

Rubber composition comprising a hydrate of a compound or a methanol solvate of a compound

A rubber composition obtained by kneading at least one selected from the group consisting of (A1), (B1), (C1) and (D1), a rubber component and a filler, and a method of improving the viscoelastic property of vulcanized rubber, comprising a first step of kneading at least one selected from the group consisting of (A1), (B1), (C1) and (D1), a rubber component, a filler and a sulfur component and a second step of thermally treating the kneaded material obtained in the previous step. 

Rubber composition

Use of S-(3-aminopropyl)thiosulfuric acid and/or a metal salt thereof for improving the viscoelastic properties of a vulcanized rubber.

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Osaka, Japan

Yasuo Uekita