Mitsubishi Chemical Corporation

Mitsubishi Engineering-plastics Corporation

Mitsubishi Gas Chemical Company, Inc.

Ryuuji Uchimura

Kazuyuki Takahashi

Masaaki Miyamoto

Kenji Tsuruhara

Toshiyuki Hamano

Tomonari Yokoyama

Masanori Yamamoto

Tatsuya Hitomi

Kazuhiro Ando

Kazuhiko Ishii

Hisashi Tahara

Michio Nakata

Yoshitaka Shiraishi

Haruhiko Kurokawa

Ryouhei Nishihara

Hideo Miyamoto, Legal Representative

Hanae Miyamoto, Legal Representative

Tetsurou Nobuyasu

Kodama Miyamoto, Legal Representative

Taro Miyamoto, Legal Representative

Kouji Iwaki

Hideki Murakami

Masaaki Deceased Miyamoto

Hisato Abe

Provided are: a polycarbonate resin composition which has excellent mechanical properties and wet heat resistance while being free from the problem of mold contamination due to mold deposits; and a production method which is capable of producing this polycarbonate resin composition with high productivity. A polycarbonate resin composition containing 60% to 95% by mass of a polycarbonate resin (A) and 40% to 5% by mass of an emulsion polymerized styrene-based resin (B), based on 100% by mass of a total of (A) and (B), wherein the emulsion polymerized styrene-based resin (B) is a graft copolymer of a styrenic monomer-vinyl cyanide monomer and/or an alkyl (meth)acrylate monomer-rubbery polymer; and a total amount of gas in a case where the resin composition is heated at 280&#xb0; C. for 10 minutes is 3000 ppm or less in terms of mass of decane.

Polycarbonate resin composition and method for producing same

To provide a polycarbonate resin composition excellent in surface hardness and impact strength. A polycarbonate resin composition comprising at least a polycarbonate resin (a) and a polycarbonate resin (b) having structural units different from the polycarbonate resin (a), which satisfies the requirements:

Polycarbonate resin composition, method for producing same and molded article of this resin composition

To provide a polycarbonate resin composition excellent in the surface hardness, the heat resistance, the moldability and the flame retardancy. A polycarbonate resin composition comprising at least a polycarbonate resin (a) and a polycarbonate resin (b) having structural units different from the polycarbonate resin (a), which satisfies the following requirements:

The object of the present invention is to provide a production method for an aromatic polycarbonate, in which eye boogers at the time of extrusion molding are reduced, and a continuous operation for a long period of time is possible. The present invention relates to a method when an extrusion molding is produced using an extruder in which a tapered parthas a half apex angle of from 4 to 20&#xb0; formed at the outlet part of a die hole, and outlet parts of plural die holesare arranged in a staggered state at the resin discharge surface side of a die plate, the shear rate &#x3b3; at the extruder outlet is from 100 to 500 sec, and the shear stress &#x3c4; is from 50 to 200 kPa.

Production method of aromatic polycarbonate

To provide a polycarbonate resin composition having improved flame retardancy and moldability. A polycarbonate resin having a ratio of the melt viscosity &#x3b7;measured at 300&#xb0; C. at a shear rate of 10 secto the melt viscosity &#x3b7;measured at 300&#xb0; C. at a shear rate of 1000 sec(&#x3b7;/&#x3b7;) of at least 3 and at most 8, a branch parameter G=[&#x3b7;]/[&#x3b7;]lin of at least 0.80 and at most 0.94, and a pencil hardness of at least HB.

Polycarbonate resin, composition of said resin, and molded article of said resin

An apparatus of a polycarbonate resin having polymerization tanks is provided. In supplying a molten reactant to a liquid phase in a polymerization tank, or supplying the molten reactant to a gas phase in the polymerization tank by an insertion pipe, in at least one polymerization tank, and/or producing a polycarbonate resin by an ester exchange reaction between an aromatic dihydroxy compound and a carbonic diester by using three vertical polymerization tanks and one horizontal polymerization tank, a wall surface temperature T of a distillation pipe is set higher than a boiling point tof by-produced phenol such that the relationship of the boiling point tof the by-produced phenol under a pressure in at least a third vertical polymerization tank, the wall surface temperature T of the distillation pipe and an inner temperature tof the third vertical polymerization tank satisfies t&#x3c;T&#x2266;t

Production apparatus of polycarbonate resin and production method of polycarbonate resin

The object of the present invention is to provide a method of producing plural kinds of aromatic polycarbonates by a melt process without changeover loss and quality deterioration. The present invention relates to a production method of an aromatic polycarbonate, comprising supplying a molten mixture of raw materials of an aromatic dihydroxy compound and/or a carbonic diester prepared in the absence of an ester exchange catalyst to polycondensation steps of two lines each equipped with three vertical reactors connected in series and one horizontal reactor, and at the same time, continuously conducting polycondensation reaction in the presence of an ester exchange catalyst.

Continuous production method and production apparatus of aromatic polycarbonate

The invention aims at providing a process for the production of polycarbonate resin which is suppressed in discoloration and reduced in the content of crystalline foreign substance, gel, and so on. The invention relates to a process for the production of polycarbonate resin from raw materials, namely, an aromatic dihydroxyl compound and a carbonic diester through continuous transesterification by the use of a production unit provided with plural reactors, which comprises producing continuously an aromatic polycarbonate resin having a viscosity-average molecular weight of 10,000 to 20,000 for a prescribed time before the termination of the continuous transesterification, discharging the polymerization fluid, cleaning the insides of the reactors with a mixture of the raw materials and then with an aromatic monohydroxy compound, feeding the raw materials and a catalyst to the reactors after the internal temperatures and degrees of vacuum of the reactors have reached respectively to levels falling within &#x2212;5% to +5% of the levels preset for manufacturing operation, and then initiating manufacturing operation again.

Production method of polycarbonate resin

The object of the present invention is to provide a production method of a high molecular weight aromatic polycarbonate containing a reduced amount of a high melting point product, and having less thermal history received and excellent hue by a melt process. The present invention relates to a production method of an aromatic polycarbonate, characterized in that in producing an aromatic polycarbonate using an aromatic dihydroxy compound and a carbonic diester as raw materials and using plural reactors, a molten reactant temperature T(&#xb0; C.) in at least one reactor A and a molten reactant temperature T(&#xb0; C.) in a reactor B subsequent to the reactor A are satisfied with the relationship of TT, and an evaporation surface area per unit treatment amount of a molten reactant in the reactor to which a molten reactant having a limiting viscosity of 0.1 dl/g or more is supplied is 1.0 m&#xb7;hr/mor more.

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Kitakyushu, Japan

Ryuuji Uchimura