Idemitsu Kosan Company, Limited

Idemitsu Petrochemical Co., Ltd.

Other

Idemistu Kosan Co., Ltd.

Yutaka Obata

Tomoaki Takebe

Tsuyoshi Ota

Takeshi Iwasaki

Daichi Ogawa

Haruhiko Mori

Masaru Nakagawa

Toshio Isozaki

Yasuhisa Sugita

Itaru Kuramoto

Takao Nomura

Takashi Sumitomo

Takayuki Nagai

Hisayuki Iwai

Koki Hirano

Yasunari Okada

Hiroyuki Higuchi

Takashi Saeki

Masatoshi Matsuda

Kenichi Mitsuhashi

Shinichi Yukimasa

Junichi Amano

Hiroki Nakashima

A thermosetting composition comprising the following component (A) and component (B), and having a viscosity of 0.1 Pa·s or higher and 100 Pa·s or lower at a shear rate of 10 sat 25° C. measured in accordance with JIS K7117-2.

Method of manufacturing a molded article

The present invention provides a thermosetting material, which contains the following components (A) to (C) and which, when measured with a rotational viscometer at a constant shear rate (JIS K7117-2:1999), exhibits a viscosity at 25° C. and 10 sof 5 Pa·s or more and 200 Pa·s or less and, when measured with a rotational viscometer at a constant shear rate in the same manner as above, exhibits a viscosity at 25° C. and a shear rate of 100 sof 0.3 Pa·s or more and 50 Pa·s or less. (A): a (meth) acrylate compound in which a substituted or unsubstituted alicyclic hydrocarbon group having 6 or more carbon atoms is ester-bonded, and which, when measured with a rotational viscometer at a constant shear rate in the same manner as above, exhibits a viscosity of 5 to 300 mPa·s as a viscosity measured at 25° C. and 10 to 100 s; (B): spherical silica; and (C): a black pigment.

Curable material and method for molding said thermally curable material

A thermosetting composition comprising: (A) a (meth)acrylate compound having a viscosity at 25&#xb0; C. of 1 to 300 mPa&#xb7;s with which a substituted or unsubstituted aliphatic hydrocarbon group including 6 or more carbon atoms is ester-bonded; (B) spherical silica; and (C) a white pigment, and having a shear viscosity at 25&#xb0; C. and 10 sof 1 Pa&#xb7;s or more and 500 Pa&#xb7;s or less and a shear velocity at 25&#xb0; C. and 100 sof 0.3 Pa&#xb7;s or more and 100 Pa&#xb7;s or less.

Thermosetting composition, and method for manufacturing thermoset resin

Provided is a (meth)acrylate composition containing: (A) at least one (meth)acrylate compound selected from the group consisting of a (meth)acrylate-modified silicone oil, a (meth)acrylate having a long-chain aliphatic hydrocarbon group, and a polyalkylene glycol (meth)acrylate having number-average molecular weight of not less than 400; (B) a (meth)acrylate compound to which an alicyclic hydrocarbon group having 6 or more carbon atoms is ester-linked; (C) (meth)acrylic acid or a (meth)acrylate compound having a polar group; (D) a radical polymerization initiator; and (E) a white pigment.

(Meth)acrylate composition

The present invention provides an optical semiconductor sealing material comprising a radically polymerized polymer of a methacrylate ester having an alicyclic hydrocarbon group containing 7 or more carbon atoms, e.g. an adamantyl group, a norbornyl group, or a dicyclopentanyl group; and an optical semiconductor sealing material comprising a radically polymerized polymer of 50 to 97 mass % of the methacrylate ester and 3 to 50 mass % of acrylate ester having a hydroxyl group. The optical semiconductor sealing material of the present invention is highly transparent and stable to UV light and thus does not undergo yellowing. In addition, the material exhibits excellent compatibility between heat resistance and refractive index, does not undergo deformation or cracking during heating processes such as reflow soldering, and shows high processability. The material can be preferably used as a sealing material for light-emitting elements and light-receiving elements of optical semiconductor devices (semiconductor light-emitting devices).

Optical semiconductor sealing material

The present invention provides a copolymer for syrup, characterized by being formed from (A) 1 to 60 mass % of at least one (meth)acrylate compound selected from among a (meth)acrylate-modified silicone oil, an alkyl(meth)acrylate, a monoalkylene glycol(meth)acrylate, and a polyalkylene glycol(meth)acrylate, and (B) 99 to 40 mass % of a (meth)acrylate compound having a C&#x2267;6 alicyclic hydrocarbon group bonded thereto via an ester bond; a (meth)acrylate composition containing a (meth)acrylate monomer and 1 to 60 mass % of the (meth)acrylate copolymer for syrup; and a cured product of the composition. The (meth)acrylate copolymer for syrup of the present invention has excellent solubility, particularly in a (meth)acrylate compound having an alicyclic ester substituent, and a (meth)acrylate resin composition containing the copolymer provides a stable cured product having high transparency and high resistance to UV rays and heat. Thus, the cured product is suitably used as a material for lenses, illumination devices, automobiles, displays, optical-semiconductors, etc.

(Meth)acrylate copolymer for syrup and resin composition thereof

Provided are a resin for an optical component, which has heat resistance, does not suffer from yellowing because of its stability against heat, and is excellent in transparency and workability; a raw material composition used for the resin for an optical component; and an optical component. Specifically, provided is a resin for an optical component containing a (meth)acrylate compound unit (A1), in which a hydrocarbon group containing an adamantane structure is ester-bonded, and a (meth)acrylate compound unit (B1) having a polyfunctional group, which is other than the unit (A1). Also, provided is a raw material composition used for a resin for an optical component, which contains a (meth)acrylate compound (A2) in which a hydrocarbon group containing an adamantane structure is ester-bonded, and a (meth)acrylate compound (B2) having a polyfunctional group, which is other than the compound (A2). Further, provided is an optical component which is obtained by polymerizing and molding the raw material composition.

Resin for optical component, raw material composition used for resin for optical component, and optical component

There are disclosed a polypropylene composition for automotive parts which has a melt index at 230&deg; C. and at 2.16 kgf of at least 30 g/10 minutes and which comprises 55 to 60% by weight of (1) propylene/ethylene block copolymer; 20 to 25% by weight of (2) rubber comprising a styrene/ethylene/propylene/styrene block copolymer and/or a styrene/ethylene/1-butene/styrene block copolymer and an olefinic elastomer; and 18 to 23% by weight of (3) talc, and also an automotive part which comprises the above polypropylene composition.

Polypropylene compositions for automotive parts

Crystalline polypropylene and its moldings and films

Crystalline polypropylene and molded object and film thereof

Provided are a propylene resin composition comprising 100 parts byweight in total of two different types of propylene polymers each having specific properties, from 0 to 50 parts by weight of a specific elastomer, and from 0 to 50 parts by weight of an inorganic filler; and a method for producing it. The production method comprises melting and kneading two polymer groups each comprising one or more propylene polymers. The resin composition in which the viscosity difference between the propylene homopolymer segments to form the base polymer and the amorphous propylene segments to form the disperse phase is small is produced by first melting and kneading one polymer group, then immediately adding the other polymer group thereto, and further kneading and melting the two. For the composition in which the viscosity difference therebetween is large, the polymer groups are separately kneaded in melt, and the resulting melts are further kneaded. The propylene resin composition has high stiffness, high impact resistance and high fluidity, and its moldings have good appearances.

Propylene resin composition and process for producing the same

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Ichihara, Japan

Yutaka Obata