The Yokohama Rubber Co., Ltd.

The Yokohama Rubber

Wonmun Choi

Daisuke Kanenari

Takashi Matsuda

Takashi Kakubo

Yuuki Shimizu

Satoshi Mihara

Naoya Amino

Hiroyuki Okuhira

Naoki Kushida

Tomoyuki Matsumura

Takeshi Hotaka

Yongcheng Jin

Kazuhiro Takase

Junichirou Natori

Kazuhiro Hatanaka

Disclosed is a rubber composition containing (A) a natural rubber, a diene synthetic rubber or a combination of them and (B) 50-120 parts by weight of a silicic acid-based or silicate-based inorganic filler per 100 parts by weight of the component (A). This rubber composition is characterized by further containing (C) 0.2-20 parts by weight of a certain amine salt per 100 parts by weight of the component (A).

Rubber composition

A compounding agent for rubber vulcanization containing an amino alcohol salt of a carboxylic acid group-containing disulfide, obtained by a reaction of a dithiocarboxylic acid and an amino alcohol, having the formula (i): 

Compounding agent for rubber vulcanization containing amino alcohol salt compound of carboxylic acid group-containing disulfide and method of production of the same and rubber composition containing the same

A rubber composition having an excellent adhesion with a brass-plated wire and an excellent heat aging resistance of a vulcanite containing (A) 100 parts by weight of a diene-based rubber, (B) 0.1 to 10 parts by weight of, as a vulcanization accelerator, an amine salt compound of a carboxylic acid group-containing disulfide having the formula (I): and (C) 0.1 to 10 parts by weight of, as a vulcanization agent, a cyclic sulfide compound having the formula (V): wherein R is a substituted or unsubstituted C-Calkylene group, a substituted or unsubstituted C-Coxyalkylene group or an aromatic ring-containing alkylene group, x is an integer of 2-6 on average and n is an integer of 1-30.

A compounding agent for rubber vulcanization comprising an amine salt compound of a carboxylic acid group-containing disulfide having the formula (I): wherein R, Rand Rare independently hydrogen or a C-Corganic group which may have a heteroatom and/or a substituent group, and X is a C-Corganic group which may have a heteroatom and/or a substituent group, a method for producing the same and a rubber composition containing the same, capable of improving the vulcanization rate and vulcanized rubber physical properties, without having a detrimental effect on the scorch time.

Compounding agent for rubber vulcanization containing amine salt compound of carboxylic group-containing disulfide, method for producing the same, rubber composition containing the same and pneumatic tire using the same as rubber for belt coat and/or belt edge cush

To provide a compound which has a higher vulcanization efficiency and superior heat aging resistance compared to conventional compounding agents for rubber compositions and which is environmentally friendly. An amine salt compound of a carboxylic acid containing a thermal dissociation portion having the Formula (I): wherein R represents an organic group selected from a Cto Calkyl group, a Cto Ccycloalkyl group, a Cto Caryl group and a Cto Calkaryl group, R, Rand Rindependently represent a hydrogen atom or a Cto Corganic group which may have a heteroatom and/or a substituent group and X represents a Cto Corganic group which may have a heteroatom and/or a substituent group and a compounding agent for rubber vulcanization and a rubber composition containing the same.

Amine salt compound of carboxylic acid having thermal dissociation portion and compounding agent for rubber vulcanization and rubber composition containing the same

A salt of carboxylic acid containing N-substituted succinimide thio group having the formula (I): wherein R is a Cto Corganic group selected from the group consisting of alkyl groups, cycloalkyl groups, aryl groups, and alkaryl groups; X is a Cto Corganic group selected from the group consisting of alkylene groups, cycloalkylene groups, arylene groups, alkarylene groups, and heterocyclic groups, X may have a substituent group or groups; M is a metal selected from the group consisting of alkaline metal, alkaline earth metal and transition metals belonging to Groups IB and IIB of the Periodic Table; n is equal to the absolute value of the ionic value of the metal M and an integer of 1 or 2.

Salt of carboxylic acid containing N-substituted succinimide thio group and unvulcanized rubber composition containing the same

A rubber composition containing 100 parts by weight a sulfur-vulcanizable rubber (A) and 0.1 to 30 parts by weight of a vulcanization agent of a cyclic polysulfide (B) having the formula (I): wherein R is a substituted or unsubstituted Cto Calkylene group, substituted or unsubstituted Cto Coxyalkylene group or alkylene group having an aromatic ring, n is an integer of 1 to 20, x is a number of 2 to 6 on average.

Rubber composition containing cyclic polysulfide as vulcanization agent and pneumatic tire using the same

An object of the present invention can be to provide a crosslinking agent which exhibits excellent storage stability and heat resistance and which is used for a composition containing a rubber and/or a resin. Such an object is realized by the compound represented by the following formula (1). In the formula, Z represents an active hydrogen-containing group; X represents a non-cyclic aliphatic group, a cyclic aliphatic group, an aromatic group, or an alkyl aromatic group, which may be optionally substituted and which may contain at least one member selected from SO, O, N, and S; Jand Jwhich are respectively included at a number of n independently represent a monovalent group, or Jand Jtogether represent a divalent group; Rwhich is included at a number of n independently represents hydrogen atom or a non-cyclic aliphatic group; and n represents an integer of 1 to 4.

Compound and composition produced by using such compound

An object of the present invention is to provide a curable composition which exhibits excellent toughness after the curing and excellent long term stability, as well as a rubber used in such curable composition. Such object is realized by a maleimide terminated rubber having maleimide structure on both ends of the molecule obtainable by reacting a rubber having amino group and/or imino group on both ends of the molecule and a bismaleimide compound, as well as a curable composition comprising such maleimide terminated rubber and a resin and/or a rubber other than such maleimide terminated rubber.

Maleimide terminated rubber and curable composition produced by using the maleimide terminated rubber

A compound having thioacetal skeleton, a precursor thereof, a cured product thereof, and a composition for their production are provided for the thermally dissociatable material based on the inventors' finding that a thioacetal group is thermally dissociatable. The use of the thermally dissociatable material of the invention enables softening or liquefaction at any desired timing through thermal dissociation at a temperature below the thermal decomposition temperature of the cured product. It is thus possible to disassemble the structure to which the thermally dissociatable material had been attached in a short time. The thermally dissociatable material is useful as a highly disposable plastic material and is adapted for use as a sealant, coating composition or adhesive. Such material may be used, for example, as a curing agent for urethane curable composition or epoxy curable composition, or as a self-curable material.

Growing community of inventors

Hiratsuka, Japan

Wonmun Choi