The Yokohama Rubber Co., Ltd.

Other

Dainippon Ink and Chemicals, Incorporated

Nippon Zeon Company, Ltd.

Nippon Chemi-con Corporation

Tetsuji Kawazura

Makoto Ashiura

Fumito Yatsuyanagi

Hiroyuki Kaido

Noriaki Kuroda

Kazunori Ishikawa

Yoshiaki Hashimura

Masayuki Kawazoe

Gou Kawaguchi

Osamu Ozawa

Jiro Watanabe

Yoshihiro Soeda

Keisuke Chino

Hidekazu Takeyama

Masahiro Ikawa

Shigeru Yamauchi

Daisuke Kanenari

Masao Nakamura

Yuichi Hara

Kazuto Yamakawa

Yasushi Kikuchi

Toru Nakamura

Hideo Nemoto

Shuji Takahashi

Takeshi Karato

Kazuo Suga

Kazuyoshi Kayama

Yoshihisa Ogihara

Giro Watanabe

Kouichi Ikai

Naoshi Miyashita

Manabu Kato

Masashi Ozawa

Takashi Satoh

Akinori Tokieda

Hideyuki Oishi

Susumu Hatanaka

Hajime Satoh

Hidekazu Onoi

Daisuke Irii

Takashi Matsuda

Masayoshi Daio

Shigeru Shinoda

Kazuhiko Kimura

Katuhiro Tanaka

Fumiaki Yoneyama

Hideki Ishida

Eri Miura

Kazuo Arakawa

Michiko Kawabata

Hiroaki Fujita

Masatoshi Iemura

Humiaki Yoneyama

Yoshihiro Aoyagi

A modified polymer is produced by reacting (A) a polymer with (B) a compound having a nitroxide free radical in the molecule stable at room temperature and in the presence of oxygen, (C) an organic peroxide, and (D) a radically polymerizable monomer having a functional group in the presence of (E) an amine compound comprising a monoamine compound represented by the general formula: NRRR(R: C-Calkyl group or aryl group; Rand R: H, C-Calkyl group, or aryl group) or a polyamine compound represented by the general formula: (R)N(RN)RN(R)(R: H or C-Calkyl group; Rand R: C-Calkylene group; n: 0 to 20). This method can not only reduce the reaction temperature but also improve the modification rate.

Method for producing modified polymer

An electrolytic capacitor sealer is formed of a modified butyl rubber composition obtained by using an organic peroxide to crosslink a modified butyl rubber composition which has been modified by reacting butyl rubber with a compound (a) having in the molecule a nitroxide free radical that is stable at room temperature even in the presence of oxygen, a radical initiator (b), and a bifunctional or higher radical polymerizable monomer (c), and of a modified butyl rubber composition obtained by compounding a radical polymerizable monomer (c) with a modified butyl rubber composition that has been obtained by reacting butyl rubber with a compound (a) having in the molecule a nitroxide free radical that is stable at room temperature even in the presence of oxygen and a radical initiator (b), and then crosslinking the composition thus obtained with an organic peroxide.

Sealing material for electrolytic capacitor and electrolytic capacitor employing the sealing material

A method for producing a rubber composition, the method including: preparing a modified natural rubber by releasing protein from rubber particles in a natural rubber latex by adding at least one organic compound selected from formaldehyde, paraformaldehyde, formalin, and glyoxal to the above mentioned natural rubber latex and then drying so as to include the released protein therein; and mixing at least one selected from carbon black and silica in this modified natural rubber. Such method reduces viscosity and improves molding processibility of the rubber composition, as well as reducing hysteresis loss.

Method for producing a rubber composition

A rubber composition obtained by compounding thereinto a rubber component containing 0.5 to 100% by weight of a modified conjugated diene-based polymer having a fullerene bonded thereto in the molecule and having a weight average molecular weight of 50,000 or more excellent processability, superior balance of modulus and heat buildup, excellent cold flowability and superior tan &#x3b4; balance.

Rubber composition containing modified conjugated diene-based polymer bonded to fullerene

A modified butyl rubber composition containing a modified butyl rubber obtained by a modification reaction of a compound (a) having a nitroxide-free radical, stable in the presence of oxygen at an ordinary temperature, in the molecule thereof and a radical initiator (b) and at least two kinds of bi- or more-functional radical polymerizable monomers (c).

Modified butyl rubber composition

A method for modifying a polymer by mixing and reacting a polymer (A), a compound (B) having a nitroxide radical in the molecule thereof, a radical initiator (C), and a radical polymerizable monomer (D) in a non-solvent system in a mixed to thereby graft a monomer (D) to the polymer (A), whereby a desired functional group is introduced to the polymer, without a causing decrease in the molecular weight, gelation, or formation of a homopolymer.

Modification method of polymer

A thermoplastic elastomer composition containing a dynamically cross-linked composition of

Thermoplastic elastomer composition

A thermoplastic elastomer having a side chain having a moiety crosslinkable by hydrogen bond containing a carbonyl-containing group and a nitrogen-containing heterocycle, and another side chain having a covalently crosslinkable moiety, the thermoplastic elastomer being able to be crosslinked at the covalently crosslinkable moiety by at least one bond selected from the group consisting of amide, ester, lactone, urethane, ether, thiourethane, and thioether. The thermoplastic elastomer exhibits excellent mechanical strength without detracting from its excellent recycleability.

Thermoplastic elastomer

A modified butyl rubber composition comprising a butyl rubber modified by mixing, under heating, (a) a compound having a nitroxide-free radical in the molecule thereof, which is stable at an ordinary temperature even in the presence of oxygen, (b) a radical initiator, and (c) a bi- or more-functional radical polymerizable monomer and further by compounded with (d) a bi- or more-functional radical polymerizable monomer, which is different from the ingredient (c).

A modified butyl rubber composition including a modified butyl rubber obtained by reacting a compound (a) having, in its molecule, a nitroxide free radical stable at an ordinary temperature in the presence of oxygen, a radical initiator (b), and a bifunctional or higher radical polymerizable monomer (c) or a modified butyl rubber composition containing a modified butyl rubber, obtained by reacting a compound (a) having, in its molecule, a nitroxide free radical stable at ordinary temperature in the presence of oxygen and a radical initiator (b), into which a bi- or more-functional radical polymerizable monomer (c) is compounded.

A method for producing an elastomer composition comprising allowing a cross-linked elastomer composition in the presence of (A) a fluid composed of a gaseous substance at an ordinary temperature and an ordinary pressure at a high pressure and (B) at least one component selected from a cross-linkable or polymerizable monomer, oligomer and polymer to thereby impregnate the component (B) into the cross-linked elastomer composition, then cross-linking or polymerizing the impregnated composition.

Production and bonding method of elastomer composition

A method for modifying a polymer comprising modifying a polymer capable of decomposing with a carbon radical in the molecule thereof by a reaction with a radical initiator and a compound having a nitroxide radical in the molecule thereof to thereby decrease a molecular weight of the polymer and also to thereby introduce an organic group derived from the free radical into the polymer.

A process for modification of a polymer comprising modifying a polymer (A) capable of decomposing by carbon radicals present in the molecule thereof using a compound (B) having a nitroxide radical in the molecule thereof and a radical initiator (C) in a ratio of (B)/(C) (molar ratio) of at least 0.7, whereby organic groups derived from the nitroxide radicals are introduced into the polymer and a modified unhalogenated butyl rubber obtained therefrom.

Process for modification of polymer

A process for production of a modified carbon black, at a cheaper cost, for rubber reinforcement having the superior tan &#x3b4; temperature dependency of silica and an excellent abrasion resistance and further having no problems arising due to a low electrical conductivity is provided. In the process for production of a modified carbon black for rubber reinforcement wherein, in the step of granulating the carbon black, a water-dispersed silica is added to the carbon black, the granulating is performed by a granulator and a process of production of a rubber composition containing a surface-treated carbon black for rubber reinforcement comprising coagulating, with a coagulating agent, a mixture of (a) 100 parts by weight, as a solid content, of a diene rubber component and (b) 10 to 250 parts by weight, as a solid content, of a slurry containing a carbon black for rubber reinforcement or (b') 10 to 250 parts by weight of a modified carbon black produced by the above method.

Process for production of modified carbon black for rubber reinforcement and process of production of rubber composition containing modified carbon black

A process for producing a modified polymer having, in the molecule thereof, an organic group(s) introduced thereinto and derived from a compound(s) having a free radical comprising reacting a polymer such as an elastomer with a compound having the free radical stable at an ordinary temperature in the presence of oxygen, after or while a carbon radical(s) is generated in the polymer, whereby the modified polymer having an improved bondability and processability is formed.

Process for producing modified polymer

Growing community of inventors

Hiratsuka, Japan

Tetsuji Kawazura