Denki Kagaku Kogyo Kabushiki Kaisha

Tohoku University

Denka Company Limited

Toshiaki Otsu

Toru Arai

Shigeru Suzuki

Masataka Nakajima

Akio Okamoto

Akihiko Nakamura

Naoki Kobayashi

Takeshi Oda

Daisuke Nagao

Mikio Konno

Yoshihiro Mashiko

Yukiko Nishitoba

Toshiaki Miyauchi

Hiroyuki Yashima

Takanori Naoe

Provided is a polychloroprene latex extremely superior in adhesion properties. According to the present invention, chloroprene or a mixture of chloroprene and a monomer copolymerizable with chloroprene is polymerized in the presence of a surfactant in an aqueous medium, in which the surfactant's concentration is lower than its critical micelle concentration (CMC) to obtain a polychloroprene latex. The polychloroprene latex produced according to the present invention is extremely superior in adhesion properties and others and give a smaller amount of deposits during production.

Method of producing a chloroprene-based polymer, polychloroprene latex and adhesive composition

Provided is a polychloroprene latex extremely favorable in adhesive properties. The present invention relates to a method of producing a polychloroprene latex, comprising polymerizing chloroprene or a mixture of chloroprene and a monomer copolymerizable with chloroprene in an aqueous medium containing a surfactant at a concentration of lower than its critical micelle concentration (CMC) and a polymer dispersant of a metal salt of aromatic sulfonic acid formalin condensate added thereto. The polymer dispersant for use is preferably a metal salt of aromatic sulfonic acid formalin condensate. The polychloroprene latex obtained can be used as an adhesive.

Method for producing polychloroprene latex, polychloroprene latex, and adhesive using the same

An olefin/aromatic vinyl compound copolymer which is excellent in transparency and which satisfies flexibility and heat resistance simultaneously can be produced by carrying out polymerization in such a manner that at least one of conditions: (a) the polymerization is carried out to an aromatic vinyl compound monomer conversion ratio of at least 50 mol % when the polymerization is completed, and (b) the polymer concentration is at least 10 mass % relative to the polymerization solution when the polymerization is completed, is satisfied, and the olefin partial pressure is changed so that the olefin partial pressure when the polymerization is completed is from 1.3 to 20 times the olefin partial pressure at the initiation of the polymerization.

Process for producing olefin/aromatic vinyl copolymer

A transition metal catalyst component for polymerization, composed of a metal complex comprising specific ligands and a specific substituted boron group and having a bridging group, which exhibits a very high activity for an olefin type (co)polymerization or an olefin-aromatic vinyl compound copolymerization, whereby the molecular weight of a copolymer obtainable, is high. A method for producing an olefin (co)polymer and an aromatic vinyl compound-olefin copolymer, by means thereof.

Transition metal catalyst component for polymerization, and method for producing a polymer by means thereof

A highly uniform vinyl compound polymer-cross-copolymerized olefin/styrene/diene copolymer excellent in processability, mechanical properties, high temperature properties, compatibility and transparency, and its composition and a process for its production, are provided. This copolymer is a crossed polymer obtained by cross-copolymerizing an olefin/styrene/diene copolymer having a styrene content of from 0.03 mol % to 96 mol %, a diene content of from 0.0001 mol % to 3 mol % and the rest being an olefin, with an olefin/aromatic vinyl compound copolymer.

Cross-copolymerized olefin/aromatic vinyl compound/diene copolymer and process for its production

A medical material and a medical device comprising an aromatic vinyl compound/&agr;-olefin random copolymer according to the present invention, are materials which contain substantially no chlorine and which have not only excellent flexibility, transparency and proper resilience but also radiation resistance and biocompatibility, and they are hence advantageously used especially in the medical field.

Medical Device

Cross-copolymerized olefin/aromatic vinyl/diene copolymer and process for producing the same

Cross-copolymerized olefin/styrene/diene copolymer, process for the production of the same and uses thereof

Transition metal catalyst component for polymerization, aromatic vinyl compound polymer having stereoregularity and method for its preparation by means of the catalyst component

The present invention provides an ethylene-aromatic vinyl compound copolymer having an aromatic vinyl compound content of from 1 to less than 55% by molar fraction, and otherwise defined in the claims, and compositions and molded products containing same.

Ethylene-aromatic vinyl compound copolymer and method for its production

A film containing at least 5 wt % of an aromatic vinyl compound-&agr;-olefin random copolymer having an aromatic vinyl compound content of from 1 to less than 99.9% by molar fraction and having head-to-tail chain structures comprising at least two aromatic vinyl compound units.

Film and stretch packaging film

Ethylene/aromatic vinyl copolymer and molded product thereof

A transition metal compound of the following formula (1) as catalyst component for the production of an aromatic vinyl compound polymer or an aromatic vinyl compound-olefin copolymer:

Transition metal compound as catalyst component for polymerization, aromatic vinyl compound-olefin copolymer having stereoregularity and method for its preparation by means of the transition metal compound as catalyst component

Growing community of inventors

Machida, Japan

Toshiaki Otsu