Mitsubishi Gas Chemical Company, Inc.

Mitsubishi Engineering-plastics Corporation

Dai Nippon Toryo Co., Ltd.

Matsushita Electric Industrial Co., Ltd.

Toshiaki Izumida

Kazuyuki Akahori

Toshikazu Umemura

Hisashi Tahara

Yoshiaki Yamamoto

Takeshi Fujishiro

Kenji Maeda

Yutaka Kojima

Naoto Obayashi

Kenji Yonemochi

Mituhiko Masumoto

Jun Yagi

Shigeo Yanada

Masanori Iwaki

Makoto Matsumura

Tsuneaki Iwakiri

Satoshi Fujii

Katsumi Yoshida

Kou Tanabe

Chikara Sadano

Kenji Ohta

Koujiro Matsuo

Sangoro Ichii

A method of injection-molding a thermoplastic resin, which involves the steps of

Method of injection-molding thermoplastic resins

A method is disclosed for the production of a molded article, using a mold assembly including a mold having a cavity, for producing a molded article from a thermoplastic resin; an insert block formed of ceramic or glass having a thermal conductivity of 2.times.10.sup.-2 cal/cm.sec..degree.C. or less, the insert block being disposed inside the mold, constituting part of the cavity, and having a thickness of 0.5 mm to 10 mm; and a cover plate for covering a peripheral portion of the insert block. The cover plate is attached to the mold and constitutes part of the cavity, wherein a clearance between the insert block and the cover plate is 0.001 mm to 0.03 mm, an amount of overlapping of the insert block and the cover plate is at least 0.1 mm. The method includes filling a molten thermoplastic resin in the cavity, and then cooling the thermoplastic resin to solidness.

Method of producing a molded article using a mold assembly with an

A method of in-mold coating using a coating composition including:

Method of in-mold coating

A process for the production of a molded article having a surface including a sealed pattern by an injection compression molding method, which comprises

Process for the production of molded article with sealed pattern

A process for producing a resin molded article having a diminished residual stress, which includes heating an injection-molded article of a thermoplastic resin by means of a combination of far infrared radiation with far infrared ray having a frequency of from 10.sup.11 to 10.sup.14 Hz and hot-air flow, thereby to diminish a residual stress in the molded article in a short period of time.

Process for producing resin molded article having diminished residual

A process for producing a polycarbonate molded article having a low dust level from a polycarbonate resin in the form of a powder or pellets by injection molding using an injection molding machine. The injection molding machine includes a cylinder whose inner circumferential wall is made of a corrosion- and abrasion-resistant alloy from alloy components (1), (2), or (3) given below and a screw part made of a steel having a metal coating formed of hard chromium plating or hard nickel plating or formed of titanium carbide or tungsten carbide, or is made of SUS420, SUS440, Hastelloy C, or a steel of alloy component (4) given below:

Process for producing low-dust-level polycarbonate molded article

A sliding resin composition comprising an aromatic polycarbonate resin composition (A) and zinc oxide whiskers (B) in an amount of from 1 to 40% by weight based on the total weight of the sliding resin composition. The sliding resin composition is suitably used in fields where a sliding property is required, such as a lens frame (lens tube) for cameras, gears and cams for OA machines and apparatus, etc.

Sliding resin composition

A process for producing a low-particle polycarbonate resin molding material suitable for use as molding material for optical materials is disclosed, which comprises directly supplying a polycarbonate resin wet powder having a water content of from 0.5 to 10.0% by weight and an organic solvent content of from 0.01 to 5.0% by weight, said wet powder, when dried, having a weight average particle diameter of from 5 to 60 mesh, to a vented extruder and extruding the wet powder while venting to obtain pellets containing not more than 20 ppm of a residual halogenated hydrocarbon. The molding material has a greatly decreased solvent content while being freed from a particle content increase.

Process for producing polycarbonate resin molding material having low

A transparent optical article is disclosed, which is produced by molding a branched polycarbonate resin having a viscosity average molecular weight of from 13,000 to 20,000 as prepared from at least one dihydric phenol compound in the presence of a polyfunctional organic compound having at least two phenolic hydroxyl groups as a branching agent in an amount of from 0.02 to 3 mol % based on the total amount of the dihydric phenol compound. The transparent molded optical article includes digital audio discs, video discs, memory discs and lenses used in the optical reading system. The optical article is greatly reduced in double refraction and has a high mechanical strength.

Optical articles of branched polycarbonate resin

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Hiratsuka, Japan

Toshiaki Izumida