Idemitsu Kosan Company, Limited

Idemitsu Petrochemical Co., Ltd.

Riken Corporation

Nobuhide Ishihara

Masahiko Kuramoto

Michitake Uoi

Kiyohiko Yokota

Masami Watanabe

Noriyuki Tani

Junichi Matsumoto

Nobuhiro Yabunouchi

Keisuke Funaki

Takuji Okamoto

Akikazu Nakano

Takashi Sumitomo

Zhaomin Hou

Masakazu Suzuki

Toshikazu Ijitsu

Hiroshi Uchida

Toshihiro Furusawa

Azuma Komeiji

Takashi Kanesaki

The present invention relates to such a copolymer comprising an olefin and an aromatic vinyl compound that has a syndiotactic structure, high block property and a wide molecular weight distribution. Specifically, it relates to a copolymer comprising an olefin and an aromatic vinyl compound, in which a content of the aromatic vinyl compound is from 1 to 99% by mol; a molecular distribution is 1.7 or more; a signal based on an (olefin-aromatic vinyl compound-olefin) linkage as a node of the copolymer, a signal based on an (aromatic vinyl compound-aromatic vinyl compound-olefin) linkage, a signal based on an (aromatic vinyl compound-aromatic vinyl compound-aromatic vinyl compound) linkage as a block linkage of the aromatic vinyl compound, and a signal based on an (olefin-olefin-olefin) linkage as a block linkage of the olefin are present; an index showing block property of the aromatic vinyl compound component is from 30 to 100%; and a stereoregularity of a repeating unit chain constituted by the aromatic vinyl compound is 80% by mol or more, a method for producing the same, a resin composition, and a stretched product.

Olefin/aromatic vinyl copolymer, process for production thereof, resin compositions containing the copolymer, and stretched products of the copolymer

The &#x3b1;-olefin-aromatic vinyl compound copolymer of the present invention is obtained by using a transition metal compound represented by the following Formula (1) and a promoter component to carry out copolymerization, and it is a novel &#x3b1;-olefin-aromatic vinyl compound copolymer having a low alternating property and a high blocking property, particularly a high blocking property related to the aromatic vinyl compound:wherein Aand Arepresent a cyclopentadienyl group, a substituted cyclopentadienyl group or the like; Yand Yrepresent a substituted or unsubstituted alkylene group or the like, and at least one of them is the substituted or unsubstituted alkylene group; Mrepresents titanium or the like; Xand Xrepresent a hydrogen atom, a halogen atom or the like.

Alpha-olefin-aromatic vinyl copolymer

Catalysts for copolymerization of olefins and styrenes, comprising (A) a transition metal compound, (B) an oxygen-containing compound and/or a compound capable of reacting with a transition metal compound to form an ionic complex, (C) a specific compound such as a reaction product of triphenylmethyl alcohol and triisobutylaluminium, and optionally (D) an alkylating agent, and methods for producing olefin-styrene copolymers in the presence of such catalysts, which catalysts have the advantages of enhancing the copolymerization activity and reducing the amount of the promoter such as oxygen-containing compounds, etc, and using them, olefin-styrene copolymers can be produced efficiently and inexpensively.

Catalyst for olefin/styrene copolymerization, and process for producing olefin/styrene copolymer

Provided is a novel olefin copolymer comprising &lsqb;A&rsqb; a cyclic olefin, &lsqb;B&rsqb; an aromatic vinyl compound and &lsqb;C&rsqb; an aliphatic &agr;-olefin having from 2 to 20 carbon atoms. (1) the component &lsqb;A&rsqb; therein accounts for from 0.1 to 30 mol %, the component &lsqb;B&rsqb; for from 0.1 to 49.9 mol %, and the total of the components &lsqb;A&rsqb; and &lsqb;B&rsqb; for from 0.2 to 50 mol %; and (2) the copolymer has a glass transition temperature Tg of lower than 60&deg; C. Having a suitable modulus of elasticity, the copolymer can be a substitute for soft polyvinyl chloride as a soft resin, and it has good elastic recovery and transparency.

Olefin copolymers and films and sheets

Styrene homo-or-co- polymers, the stereoregularity of which is mainly syndiotactic are disclosed, having repeating unit or two or more different repeating units defined by a general formula (I): ##STR1## wherein each R may be the same or different. And a method of preparation of syndiotactic copolymers wherein there are two different repeating units represented by formula (I); wherein the polymerization is carried out with a catalyst comprising (a) a titanium compound and (b) a contact product of an organoaluminum compound and a condensing agent such as water.

Syndiotactic styrene polymers

Production process of olefin based polymers

Styrene homo-or-co- polymers, the stereoregularity of which is mainly syndiotactic are disclosed, having repeating unit or two or more different repeating units defined by a general formula (I): ##STR1## wherein each R may be the same or different. And a method of preparation of syndiotactic copolymers wherein there are two different repeating units represented by formula (I); wherein the polymerization is carried out with a catalyst comprising (a) a titanium compound and (b) a contact product of a organoaluminum compound and a condensing agent such as water.

Process for producing syndiotactic styrene copolymer

A process for producing a propylene based oligomer which comprises polymerizing propylene alone or propylene and an olefin other than propylene in the presence of a catalyst comprising:

Process for producing propylene based oligomers

The present invention relates to a styrene-based resin composition comprising a styrene-based polymer having mainly a syndiotactic configuration and a specified antioxidant, a fibrous molding or extrusion produced by spinning a syndiotactic styrene resin composition and a molding produced by shaping and/or spinning, and stretching said resin.

Styrene-based resin composition

A novel crystalline vinylcyclohexane-based polymer having a repeating unit represented by the general formula: ##STR1## (wherein all the symbols are as defined in the appended claims), a degree of polymerization of at least 5 and mainly syndiotactic configuration. This polymer is produced by hydrogenating a styrene-based polymer having a repeating unit represented by the general formula: ##STR2## (wherein all the symbols are as defined in the appended claims), a degree of polymerization of at least 5 and mainly syndiotactic configuration.

Vinylcyclohexane-based polymers and process for production thereof

A process for production of styrene polymers is disclosed, comprising polymerizing styrene monomers by the use of a catalyst comprising (a) a titanium compound and (b) a contact product of an organoaluminum compound and a condensing agent, and further in the presence of hydrogen. The styrene polymers produced by the present process have a stereo structure that substituent groups are mainly in the syndiotactic configuration. Thus the styrene polymers have high heat resistance and high solvent resistance as compared with atactic polystyrene commonly used and are useful as materials for production of articles for which high heat resistance and high solvent resistance are required.

Process for production of styrene polymers

A process for production of styrene polymers of high syndiotactic configuration is disclosed, comprising polymerizing styrene or styrene derivatives by the use of a catalyst comprising: (A) a titanium compound, e.g., at least one compound selected from those represented by the formulae: TiR.sup.1.sub.a R.sup.2.sub.b R.sup.3.sub.c X.sup.1.sub.4 -(a+b+c) and TiR.sup.1.sub.d R.sup.2.sub.e X.sup.1.sub.3-(d+e) (all the symbols are as defined in the appended claims); and (B) a contact product of an organoaluminum compound and a condensation agent, e.g., a product resulting from modification of trimethylaluminum with water. Because of such high syndiotactic configuration, the styrene polymers are greater in thermal resistance and solvent resistance than conventional atactic polystyrene.

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Sodegaura, Japan

Nobuhide Ishihara