Mitsubishi Gas Chemical Company, Inc.

Shu Yoshida

Noriyuki Kato

Toshiaki Yamada

Kazuaki Kaneko

Hiroki Furuhashi

Keiichi Kameyama

Yoshinori Isahaya

Satoshi Nagai

Jun Hagiwara

Osamu Kondo

Makoto Sasaki

Hiroaki Tanaka

Yuki Motoyama

Takayasu Fujimori

Takashi Ishii

Takashi Konishi

Hiromitsu Nagashima

Eiji Koshiishi

Takeru Horino

Toyoji Oshima

Ryuji Sugai

Rintaro Takahashi

Yuki Kumagai

Kazuya Sekihara

A resin composition for transparent substrates comprises an epoxy resin (A) and a curing agent (B), wherein the curing agent (B) comprises a cyclohexane tricarboxylic anhydride.

Resin composition, prepreg, and film

To provide a polycarbonate resin composition having a high Abbe's number, high strength and excellent stainability. Disclosed is a polycarbonate resin composition prepared by blending

Polycarbonate resin composition

To provide a polycarbonate resin composition excellent in low-birefringence and strength. Disclosed is a polycarbonate resin composition prepared by blending  

A method for highly polymerizing an aromatic polycarbonate resin, which enables the increase in molecular weight of the aromatic polycarbonate resin satisfactorily while keeping good quality of the resin. An aromatic polycarbonate is linked to an aliphatic diol compound having a boiling point of 240&#xb0; C. or higher (preferably in an amount of 0.01 to 1.0 mole per mole of the total amount of the terminal of the aromatic polycarbonate) through a transesterification reaction in the presence of a transesterification catalyst under reduced pressure conditions (preferably at a reduced pressure ranging from 13 kPaA (100 torr) to 0.01 kPaA (0.01 torr)), thereby increasing the molecular weight of the resulting molecule. The weight average molecular weight (Mw) of the aromatic polycarbonate after the transesterification reaction can be increased preferably by 5,000 or more compared to that of the aromatic polycarbonate before the transesterification reaction.

Process for production of highly polymerized aromatic polycarbonate resin

A polycarbonate resin having at least one terminal group which is represented by formula (1), and a resin composition and an optical material comprising the polycarbonate resin are disclosed. In the formula, R-Reach independently represent a hydrogen atom, halogen atom or an alkyl group. Xrepresents a direct bond or alkylene group. 

Polycarbonate resin having ultraviolet absorbing capability, resin composition and optical material

The invention relates to a method for producing a thermoplastic resin, comprising using a composition at least comprising a fluorene-containing dihydroxy compound represented by the following formula (1) and a fluorene-containing hydroxy compound represented by the following formula (2) in an amount of from 0.5 parts by weight to 1.5 parts by weight relative to 100 parts by weight of the fluorene-containing dihydroxy compound of formula (1). 

Method for producing thermoplastic resin, polyester resin and polycarbonate resin, and their applications

The present invention relates to a polycarbonate resin composition which comprises a polycarbonate resin having the repeating unit that is represented by the following general formula (1) and a hydroxyl group at terminal thereof and has the concentration of the terminal hydroxyl group of 1000 ppm or more.

Polycarbonate resin composition and method of producing the same

An optical lens which can be produced by injection molding on an industrial scale, and which has a high refractive index, a low Abbe's number, a low birefringence index, a high transparency and a high glass transition temperature. The optical lens can be produced by injection molding of a polycarbonate resin (preferably having a reduced viscosity of 0.2 dl/g or higher and a glass transition temperature of 120 to 160&#xb0; C.), wherein the polycarbonate resin is produced by reacting a diol component comprising 99 to 51 mol % of 9,9-bis(4-(2-hydroxyethoxy)phenyl)fluorene and 1 to 49 mol % of bisphenol A with a carbonate diester. It becomes possible to produce an optical lens preferably having a refractive index of 1.60 to 1.65, an Abbe's number of 30 or smaller, a birefringence index of 300 nm or lower and an all light transmittance of 85.0% or higher.

Optical lens

The present invention can provide a polycarbonate resin containing a structural unit represented by the following formula (1). 

Polycarbonate resin and method for producing the same

Process for producing polycarbonates

Aldehyde compounds contained in polycyclic diols as impurities are effectively removed by distilling the polycyclic diols in the presence of an alkali metal compound and/or a alkaline earth compound. The distilled polycyclic diols are useful as a diol component of a polymer such as polycarbonate with less yellowing.

Distillation of polycyclic diol

A process for producing an aromatic-aliphatic copolycarbonate which is excellent in impact resistance and heat resistance and has large Abbe number, small photoelasticity constant, and excellent color tone. The process comprises conducting polycondensation in a reactor made of a stainless steel comprising at least 12 wt % nickel, at least 22 wt % chromium, and at least 50 wt % iron.

Process for producing aromatic-aliphatic copolycarbonate

Processes for producing an aromatic/aliphatic copolycarbonate which has excellent impact resistance, excellent heat resistance, a high Abbe's number, a low photoelastic coefficient, and an excellent color tone. The processes include those in which: an aromatic/aliphatic copolycarbonate having a nitrogen content of 9 ppm or lower is produced from an aliphatic dihydroxy compound having a nitrogen content of 10 ppm or lower; an aromatic/aliphatic copolycarbonate is produced from an aliphatic dihydroxy compound having an iron content of 1 ppm or lower; an aromatic/aliphatic copolycarbonate is produced from an aliphatic dihydroxy compound having a content of aldehyde groups and/or formyl groups of 100 ppm or lower; an aromatic/aliphatic copolycarbonate is produced by subjecting an aromatic dihydroxy compound and an aliphatic dihydroxy compound having a content of free chlorine of 5 ppm or lower to polycondensation with heating and melting; and an aromatic/aliphatic copolycarbonate is produced from an aliphatic dihydroxy compound which has a melt Hazen unit of 40 or smaller after having been maintained at 260&deg; C. for 5 hours in the air.

Processes for producing aromatic/aliphatic copolycarbonate

Phenols are reacted with a hydrogen peroxide in the presence of a crystalline titanosilicate catalyst and a cyclic ether, such as dioxane, as a solvent. The method provides especially high para-selectivity compared with conventional methods, and, at the same time, provides high yields of dihydric phenols versus hydrogen peroxide.

Growing community of inventors

Tokyo, Japan

Shu Yoshida