Mitsui Chemicals, Inc.

Atsushi Shibuya

Hideaki Oikawa

Yoshihiro Sakata

Masahiro Ohta

Shoji Tamai

Wataru Yamashita

Yuichi Okawa

Takashi Kuroki

Tomomi Yoshimura

Keisuke Takuma

Tomomi Okumura

Akihiro Yamaguchi

Yasunori Yoshida

Masanobu Ajioka

Atsuo Otsuji

Masatoshi Takagi

Tatsuhiro Urakami

Akio Karasawa

Toshiyuki Hirose

Kenji Doi

Masanori Iwazumi

Masaji Yoshimura

Yasuhiro Takano

Rihoko Suzuki

Toshihiro Motoshima

Hiroyasu Kido

Sadao Yoshimoto

Masato Kawamura

Kayako Yanagihara

Masaaki Ogizawa

Noritsuna Saito

Takeshi Suzuki

Noboru Koga

Kimiyoshi Miura

There are provided a resin composition that is suitable for an optical component which, while maintaining moldability, low birefringence, heat resistance, mass productivity, mechanical strength, and light transmittance, hardly exhibits a low light transmittance during the use of a blue-violet laser beam source and a deterioration in optical properties, and an optical component produced by molding the resin composition, and a optical pickup device using the optical component. The present invention provides a resin composition comprising 0.05 to 5 parts by weight of the specific hindered amine compound based on 100 parts by weight of the polymer having an alicyclic structure in at least a part of repeating structural unit, an optical component produced by molding the resin composition, and a optical pickup device using the optical component.

Resin composition and optical component

A molding material of the present invention includes a polymer having a repeating structural unit whose part or whole contains an alicyclic structure, a phenolic stabilizer, a hindered amine light stabilizer and a phosphorus stabilizer, in which at least a part of the phenolic stabilizer and/or hindered amine light stabilizer is presently adhering to the surface of particles of the above polymer.

Molding material, use thereof, and process for producing molding material

Provided is a process for producing a cycloolefin resin composition, comprising a step of hydrogenating a resin composition. The resin composition before hydrogenation, which is used in the above step, includes 0.01 to 20 parts by weight of an unsaturated hydrocarbon compound having a boiling point of 50&#xb0; C. or higher, for example, a monomer employed in polymerization, per 100 parts by weight of the resin composition.

Process for producing cycloolefin resin composition, and cycloolefin resin composition

A process for producing a cycloolefin resin composition comprising a cycloolefin resin and an additive by using a twin-screw extruder is provided, in which loss of the additive caused by volatilization through a vent during kneading is reduced and kneading of resin material with the additive can be sufficiently carried out. When the cycloolefin resin and the additive are kneaded by using a vented twin-screw extruder () to produce the cycloolefin resin composition containing the additive, an additive introduction opening () is disposed downstream of a vent () located nearest to a discharge opening () of the twin-screw extruder, and the additive is charged through the additive introduction opening located at a distance from the discharge opening of the twin-screw extruder in the range between longer than 10D and not longer than 30D.

Process for producing cycloolefin resin composition

A process of preparing a polyimide of the present invention comprises effecting an imidization reaction of a diamine and a tetracarboxylic dianhydride in a solvent containing 50 to 100% by weight of an equimolar composition of a nitrogen-containing cyclic compound indicated by chemical formula (1) below and a phenol indicated by chemical formula (2) below:in formula (1), X represents &#x2014;CH&#x2014; or &#x2014;N(CH)&#x2014;, and in formula (2), Rand Rmay be the same as, or different from, each other and represent each any one of &#x2014;H, &#x2014;OH, &#x2014;CH, &#x2014;CH, &#x2014;CH, &#x2014;CH, &#x2014;CH, &#x2014;CH, &#x2014;CH, &#x2014;CH, &#x2014;CH, &#x2014;CH, &#x2014;OCH, &#x2014;O(CH), &#x2014;NO, &#x2014;Cl, &#x2014;Br and &#x2014;F.

Process for producing polyimide

This invention provides crosslinkable-group-containing polyimides of various known thermoplastic polyimide backbone structures, which are provided with far better heat resistance, chemical resistance and mechanical properties than known polyimides of the structures without impairing excellent moldability or formability, superb sliding property, low water absorption property, outstanding electrical properties, high thermal oxidation stability and high radiation resistance, all of which are inherent to the structures.

Polyimide containing crosslinkable group and process for producing the same

A thermoplastic polyimide having good thermal stability, comprising a repeating unit represented by the chemical formula (1), a molecular terminal being composed of the chemical formula (2) and/or chemical formula (3), characterized in that: a melt viscosity ratio calculated by the numerical formula (1) and/or the numerical formula (3) is within a numerical range shown in the numerical formula (2) and/or the numerical formula (4) and 1,3-bis(4-aminophenoxy)benzene represented by the chemical formula (3) for production of the above polyimide, characterized in that the content of an azo compound is from 0.0 to 0.2%. The thermoplastic polyimide of the present invention has excellent characteristics {circle around (1)} to {circle around (4)} described below. {circle around (1)} It is superior in thermal stability on melting. That is, the degree of lowering of the fluidity on melting with a lapse of time is small and it is possible to apply to conventional melt molding. {circle around (2)} It has high heat resistance. {circle around (3)} It is superior in productivity. {circle around (4)} It is superior in dimensional accuracy.

Crystalline polyimide for melt molding with satisfactory thermal stability

There is disclosed an organic optical component prepared from a resin essentially comprising one or more repetitive structural units selected from the group consisting of structures represented by general formula (1); ##STR1## wherein A is either of the groups below. ##STR2## This invention provides an organic optical component with excellent transparency, heat resistance and mechanical strength as well as a low birefringence. This invention also provides a novel aromatic polyamide with a low permitivity and excellent transparency, processability and thermal stability, besides excellent heat resistance inherent in an aromatic polyamide.

Fluorine-containing polyamide

A low-birefringent organic optical component comprising a polymer prepared by polymerizing a racemic mixture of the monomer with an asymmetric spiro ring represented by general formula (1) as an essential ingredient; wherein ring A represents a monocyclic or polycyclic organic group, wherein two ring As are mutually bound each other via a spiro bond to form a spiro ring which has a molecular asymmetric structure; n is an integer of 0 to 10; X.sub.1 and Y.sub.1 are binding groups; and Z.sub.1 is a polymerization-active group. The component has excellent transparency, mechanical strength and heat resistance, as well as a low birefringence.

Low-birefringent organic optical component and a spirobiindan polymer

A low birefringent organic optical component prepared from a resin consisting essentially of one or more repetitive structural units selected from the group consisting of structures represented by general formula (1); ##STR1## wherein A is either of the groups below. ##STR2## The organic optical component can exhibit excellent transparency, heat resistance and mechanical strength as well as a low birefringence. Also provided is a novel aromatic polyamide with a low permitivity and excellent transparency, processability and thermal stability, besides excellent heat resistance inherent in an aromatic polyamide.

Organic optical component

A sliding material and a heat resistant filament which primarily comprises a liquid crystal polyimide, a liquid crystal polyamide or a liquid crystal polyamide-imide copolymer having at least one recurring structural unit selected from the formula (1) and the formula (2) and is excellent in heat resistance, mechanical characteristics and other fundamental properties of polyimides, and relates to significant improvement of heat-resistance by heat-treating the sliding material, the filament and the molded items. The liquid crystal polyamide-imide copolymer which comprises in a polymer molecule 0.05.about.0.95 mole ratio of the recurring structural units of the formula (1) and 0.95.about.0.05 mole ratio of recurring structural units of the formula (2) has excellent processing ability ##STR1##

Liquid crystal polyamide-imide copolymer

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Funabashi, Japan

Atsushi Shibuya