Mitsubishi Gas Chemical Company, Inc.

Mitsubishi Gas Company, Inc.

Takao Kawaki

Akitoshi Sugio

Katsushige Hayashi

Makoto Kobayashi

Toshiaki Yamada

Akikazu Amagai

Eiichi Yonemitsu

Hajime Ban

Hidefumi Harada

Osamu Aoki

Yuh Miyauchi

Koji Yamamoto

Masahito Watanabe

Masaki Nagata

Fumiya Zaima

Masanobu Masu

Masahiko Ishikawa

Hiroshi Ogawa

Masamichi Mizukami

Yasuhiko Kijima

Tatsuo Iwai

Toshio Watanabe

Toru Nakajima

Ryozo Kawai

Isamu Masumoto

Mituhiko Masumoto

Yukio Sasaki

Yasuhiro Hirai

Hiroyuki Urabe

Katsuhiro Iura

Akihiko Konishi

Atsuo Kuramoto

Zempei Mizutani

Tatsuhiko Kurihara

Akio Hasebe

Eizi Ukita

Yoshie Hiramatsu

Sumio Iwao

Nobuhiro Shintani

Yukifumi Goto

Satoshi Ueno

Yuji Takeda

Resin composition

A resin composition comprising a melt-kneaded product of (A) an aromatic polyamideimide resin (Component A) which is obtained by polymerizing an aromatic tricarboxylic acid anhydride and a diisocyanate in a solvent under conditions where an amide group is substantially formed first and then an imide group is formed, and which has at least one recurring unit of the formula (1), ##STR1## wherein Ar is a trivalent aromatic hydrocarbon group having at least one 6-membered carbon ring, and R is a divalent aromatic hydrocarbon group or an aliphatic hydrocarbon group, and (B) a polyphenylene sulfide resin (Component B); and the molded article obtained by molding said resin composition.

Resin composition of polyamideimide and polyphenylene sulfide

A process for producing an aromatic carbonate which comprises: reacting

Method for preparing aromatic carbonate

A heat-resistant resin composition comprising a melt-kneaded product of:

Heat-resistant resin composition

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 novel sulfur-containing aromatic vinyl compound represented by the following general formula (I) ##STR1## wherein R.sub.1 represents an alkylene group having 1 to 3 carbon atoms and R.sub.2 represents an alkylene group having 2 to 8 carbon atoms, and the two bonds in the benzene ring are meta or para to each other. A curable composition comprising at least one of the said vinyl compounds, an isocyanate compound and a radical polymerization initiator. On heating, the composition gives a crosslinked polymer article useful as lenses.

Sulfur-containing aromatic vinyl compound, crosslinked polymer articles

A sulfur-containing aliphatic acrylic compound represented by the following general formula [I] ##STR1## wherein R.sup.1 represents a hydrogen atom or a methyl group, R.sup.2 represents an aliphatic hydrocarbon group having 1 to 8 carbon atoms, and R.sup.3 represents an aliphatic hydrocarbon group having 1 to 8 carbon atoms which may contain oxygen or sulfur in the main chain; a crosslinked polymer article obtained by polymerizing and curing a monomeric mixture composed of 100 to 60% by weight of at least one sulfur-containing aliphatic acrylic compound represented by the general formula [I] and 0 to 40% by weight of another copolymerizable monomer containing an ethylenic bond in a mold together with a radical initiator; a lens composed of the cross-linked polymer article thereof; and a process for producing a crosslinked polymer article thereof.

Sulfur-containing aliphatic acrylic compound, crosslinked polymer

An aromatic-aliphatic polycarbonate copolymer having a structural unit represented by the formula (1) ##STR1## and a structural unit represented by the formula (2) ##STR2## the molar function of the structural unit represented by the formula (1) being 70 to 10%, and the reduced viscosity as determined at 20.degree. C. in a 0.2 g/dl solution of the copolymer in methylene chloride as a solvent being 0.3 to 1.0 dl/g.

Aromatic-aliphatic polycarbonate copolymer

A resin composition for optics is disclosed, which mainly comprises a graft copolymer comprising a styrene resin and an aromatic polycarbonate each having a specific molecular weight at a specific ratio of molecular weight and weight, said composition having a micro disperse phase of not more than 0.5 .mu.m. The resin composition has a reduced optical strain and an excellent micro disperse phase and is, therefore, suitable for use as optics.

Molding material for optics

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 method for recovering polyphenylene oxide having a high bulk density and a reduced content of fine particles from a solution of a polyphenylene oxide, which comprises adding a non-solvent composed of a lower alkyl alcohol and water to an aromatic solvent solution of a polyphenylene oxide substantially free from impurities to precipitate the polyphenylene oxide, the weight ratio of the aromatic solvent to the lower alkyl alcohol being from 1:1 to 1:2 and the weight ratio of the lower alkyl alcohol to water being from 1:0.005 to 1:0.1 in the precipitation system, and the addition of the non-solvent being controlled such that a liquid composition of the aromatic solvent, the lower alkyl alcohol and water forms a single phase; and recovering the precipitated polyphenylene oxide.

Method for recovering polyphenylene oxides

A resin composition comprising (A) 5 to 95 parts by weight of a copolyphenylene ether derived from a mixture of 50 to 98 mole% of a 2,6-dialkylphenol and 2 to 50 mole% of a 2,3,6-trialkylphenol and (B) 5 to 95 parts by weight of a styrene resin. The composition has superior thermal resistance and oxidation stability under heat and satisfactory mechanical properties, and retains these desirable properties after heat-aging. The composition is suitable for preparation of molded articles.

Resin composition containing copolyphenylene ether

A polyphenylene ether random copolymer excelling in heat resistance and resistance to solvents, said copolymer being composed of 50-98 mol% of a structural unit of the formula ##STR1## derived from 2,6-dimethyl phenol and 50-2 mol% of a structural unit of the formula ##STR2## derived from 2,3,6-trimethylphenol, each of said structural units being randomly arranged in the polymeric structure, said copolymer having an intrinsic viscosity, as measured in chloroform at 25.degree. C., of at least 0.3 dl/g.

Novel polyphenylene ether and process for preparing the same

Growing community of inventors

Tokyo, Japan

Takao Kawaki