Mitsubishi Gas Chemical Company, Inc.

Other

Mgc Filsheet Co., Ltd.

Renesas Technology Corp.

Mitsubishi Electric Engineering Company, Limited

Katsushige Hayashi

Takao Kawaki

Masayuki Nakajima

Akitoshi Sugio

Yasuhiro Suzuki

Michio Kawai

Makoto Kobayashi

Masatoshi Kimura

Masahito Watanabe

Noriyuki Kato

Jun Yokoyama

Masaki Nagata

Fumiya Zaima

Takanobu Suzuki

Masahiko Ishikawa

Hiroshi Ogawa

Atsushi Hirashima

Masamichi Mizukami

Mitsuo Miura

Yuh Miyauchi

Toshio Watanabe

Takuya Hasaki

Ryozo Kawai

Mitsuhiko Masumoto

Haruaki Eto

Yuji Takeda

Katsuhiro Iura

Syoichi Nito

Mituo Miura

Tamaki Tsuruda

Hiroshi Miyamori

Tadashi Simomura

Junji Takano

Tsutomu Kawakami

Katuhiro Iura

Satoshi Ueno

Hiroshi Takeguchi

Hiroshi Nakano

Tsutomu Nara

The present invention can provide a polymer film having an Ra (arithmetic average roughness) of 0.5 &#x3bc;m to 2.5 &#x3bc;m, an Ry (maximum height) of 3 &#x3bc;m to 11 &#x3bc;m, an Rz (ten-point average height) of 3 &#x3bc;m to 8 &#x3bc;m, and a light transmittance of 85% or higher. A preferable embodiment of the present invention can provide, at the same time, an optical diffusion function, an improved luminance, a transmittance and the like which are of a sufficient level not realized conventionally. In a still preferable embodiment, Sm (average concave-concave/convex-convex interval) of 90 &#x3bc;m to 160 &#x3bc;m and the average inter-local peak interval (S) is 5 &#x3bc;m to 15 &#x3bc;m.

Polymer film

Disclosed is a film suitable for improvement of luminance, contrast and view angle of a liquid crystal display. Specifically disclosed is a retardation film having a thickness of 30-500 &#x3bc;m, a light transmittance of not less than 85%, and an Nz factor of not less than 10.

Retardation film

A semiconductor memory device is of a bank switching type having a plurality of memory array banks provided in a memory chip which can be switched from one to another for storage operation. The semiconductor memory device includes: a plurality of memory arrays in the memory array banks; an input/output circuit for transmitting information data between the memory arrays and the outside; a data bus for connecting between the memory arrays and the input/output circuit; and N-channel transistors provided across the data bus. The data bus consists of a plurality of adjacent lines. Each of N-channel transistors is connected at their drain to the corresponding lines of the data bus while at their source to the ground. When a multi-bit test is commenced for writing and reading data on the memory arrays, the N-channel transistors are turned on to connect the lines of the data bus to the ground.

Semiconductor memory device and its testing method

Aromatic polycarbonate

An aromatic polycarbonate composition which has excellent thermal stability and maintains high transparency and a satisfactory hue even at high temperatures. The aromatic polycarbonate composition comprises: a polycarbonate obtained by reacting at least one aromatic dihydroxy compound with a compound capable of incorporating a carbonate bond; and a phosphorus compound represented by the following formula (1):

Aromatic polycarbonate composition

A method of producing a polycarbonate excellent in the hue, the thermal stability, and the electrolysis stability by supplying a polycarbonate obtained by a transesterification method to an extruder having vent(s), melting the polycarbonate, and adding an acidic compound to the molten polycarbonate followed by kneading to continuously devolatilize low molecular weight compounds remaining in the polycarbonate. Better result is obtained by adding water to the kneaded mixture of the polycarbonate and the acidic compound before devolatilizing the low molecular weight compounds.

Production method of polycarbonate

A process for preparing a polycarbonate which comprises performing a transesterification and a polycondensation reaction with a diarylcarbonate and dihydroxyaryl compound, in a reaction apparatus composed of stainless steel comprising at least 12% by weight of Ni, and at least 22% by weight of Cr, and having Fe as the remaining main component. A polycarbonate which has a good color, is stable to hydrolysis and resistant to heat-yellowing is the resulting product.

Method for preparing polycarbonates by transesterification in a steel

A process for producing an aromatic carbonate which comprises: reacting

Method for preparing aromatic carbonate

A process for producing a carboxylated compound, which comprises reacting a carbonyl compound with hydrogen peroxide in the presence of an organo-arsenic acid of the formula (1), ##STR1## wherein: R.sup.1 is a C.sub.1 -C.sub.12 alkyl group which may be substituted or an aryl group which may be substituted,

Process for producing carboxylated compound

An anti-dazzling polycarbonate polarizing plate is formed with a polarizing thin layer composed of a polymeric film having a dichroic substance adsorbed on and oriented in the polymeric film, and a polycarbonate sheet having a retardation value of at least 2000 nm bonded to one or both surfaces of the polarizing thin layer.

Anti-dazzling polycarbonate polarizing plate

A photosensitive polyimide precursor composed of the structural units (A) represented by the following general formula (I) and the structural units (B) represented by the following general formula (II), in which the ratio of the molar quantity of the structural units (A) to the sum of the molar quantity of the structural units (A) and that of the structural units (B) is 0.01 or greater, and having a viscosity of 100 cP or above as measured at 25.degree. C. in the state of a 10% by weight solution in N-methylpyrrolidone: ##STR1## wherein R.sub.1 represents a tetravalent aromatic hydrocarbon residue; R.sub.2 represents a divalent aromatic hydrocarbon residue; X, identical or different represents a halogen or an alkyl group; and m represents 0 or an integer from 1 to 4. The photosensitivity of the present photosensitive polyimide precursor is about 20 to 100 times that of conventional products. After heat dehydration cyclization, it shows a heat resistance of 400.degree. C. or above.

Photosensitive polyimide precursor

The photosensitive polyimide precursor of the invention has a recurring unit represented by the following general formula [I]: ##STR1## (R.sub.1 represents a tetravalent aromatic hydrocarbon residue; R.sub.2 and R.sub.3 each represent a divalent aromatic or aliphatic hydrocarbon residue; and R.sub.4 represents a divalent aromatic hydrocarbon residue represented by ##STR2## wherein R.sub.5, R.sub.6, R.sub.7, R.sub.8, R.sub.9, R.sub.10, R.sub.11 and R.sub.12, identical or different, each represent hydrogen atom, a halogen group or an alkyl group). The photosensitive polyimide precursor of the invention has a viscosity of 50 centipoises or above as measured at 23.degree. C. in the state of a 10% (by weight) solution in N,N-dimethylacetamide. Its photosensitivity is as high as about 20-100 times that of prior products. After heat cyclization, it exhibits a heat resistance of 400.degree. C. or above. The photosensitive polyimide precursor of the invention can be produced by subjecting a tetracarboxylic acid dianhydride and a diamino compound to a polycondensation reaction in an organic polar solvent.

Photosensitive polyimide precursor and process for producing the same

A process for producing an oxalate diester is provided. The oxalate diester is produced by reacting an aliphatic alcohol, carbon monoxide and molecular oxygen at an elevated temperature and under pressure in the presence of a catalyst comprising (1) metallic palladium or a palladium compound, (2) a heteropoly-acid and (3) at least one nitrogen compound selected from the group consisting of nitric acid, nitrogen oxides and esters of nitrous acid.

Process for producing oxalate diester

Growing community of inventors

Tokyo, Japan

Katsushige Hayashi