公开(公告)号：JPH0652648A

公开(公告)日：1994-02-25

申请号：JP20250492

申请日：1992-07-29

Applicant: MITSUBISHI CHEM IND

Inventor： FUKUSHIMA ISAMU ,  SENDA SUSUMU

IPC: G11B23/02 ,  G11B23/03

Abstract: PURPOSE:To substantially prevent the sticking of dust, etc., and to decrease malfunctions by allowing an antistatic agent consisting of a benzene sulfoneamide deriv. to exist on the surface of the cartridge. CONSTITUTION:The antistatic agent consisting of the benzene sulfoneamide deriv. is added at 0.5 to 3 pts.wt. to 100 pts.wt. polycarbonate resin of bisphenol A type having 140000 to 25000mol.wt. and after both are dry blended, the mixture is melted and kneaded by a twin-screw extruder (at 260 deg.C) by which the mixture is pelletized. The pellets formed in such a manner are injection molded to form cartridge halves for optical disks. As a result, the antistatic agent consisting of the benzene sulfoneamide deriv. is made to exist on the cartridge surface. Thermoplastic resins, such as polymethyl methacrylate, ABS resin and amorphous polyolefin, in addition to the polycarbonate resin are used as the base material to be used for the cartridge and the polycarbonate resin is particularly adequate.

公开(公告)号：JPH03241544A

公开(公告)日：1991-10-28

申请号：JP3791490

申请日：1990-02-19

Applicant: MITSUBISHI CHEM IND

Inventor： FUKUSHIMA ISAMU ,  TAKADA MASAKATSU

IPC: G11B7/26 ,  G11B7/24

Abstract: PURPOSE:To prevent the generation of defects by inclusion of bubbles, etc., by irradiating exposed polycarbonate parts with energy rays to treat the polycarbonate surface to attain >=80 deg. contact angle and applying an adhesive thereto and adhering the exposed part. CONSTITUTION:The polycarbonate substrates provided with recording layers are adhered to each other or this substrate and other substrate are adhered with the recording layer side on the inner side by using the adhesive. The parts exposed with the polycarbonate are formed in the outer and inner peripheral parts of the polycarbonate substrates on the side provided with the recording layers. The exposed polycarbonate parts are irradiated with the energy rays and are thereby treated until the polycarbonate surface attains

公开(公告)号：JPS62114983A

公开(公告)日：1987-05-26

申请号：JP25564785

申请日：1985-11-14

Applicant: MITSUBISHI CHEM IND

Inventor： OSHIMA ETSUKAZU ,  FUKUSHIMA ISAMU

IPC: C07D307/33 ,  C07D307/32

Abstract: PURPOSE:To remove acid components from crude gamma-butyrolactone economically on an industrial scale and to obtain high-purity gamma-butyrolactone, by heat-treating gamma-butyrolactone in the presence of an alkaline earth metal oxide and/or hydroxide and distilling the treated product. CONSTITUTION:Crude gamma-butyrolactone (especially gamma-butyrolactone produced by catalytically hydrogenating maleic anhydride or its partial hydride and removing low-boiling components and high-boiling components from the reaction product preferably by distillation) is purified by distillation after heat-treatment at 100-250 deg.C, preferably 120-250 deg.C in the presence of one or more compounds selected from an alkaline earth metal oxide and hydroxide. The side reaction of gamma-butyrolactone can be suppressed and purified gamma-butyrolactone having remarkably low acid content and useful as various solvents, improver or intermediate for pharmaceuticals or agricultural chemicals can be economically produced on an industrial scale.

公开(公告)号：JPS5936613B2

公开(公告)日：1984-09-05

申请号：JP12949675

申请日：1975-10-28

Applicant: Mitsubishi Chem Ind

Inventor： KOIKE SAKAE ,  ISHII TOSHIKAZU ,  FUKUSHIMA ISAMU

IPC: C07C55/08 ,  C07C51/00 ,  C07C67/00 ,  C07C253/00 ,  C07C255/19

公开(公告)号：JPH03241545A

公开(公告)日：1991-10-28

申请号：JP3791590

申请日：1990-02-19

Applicant: MITSUBISHI CHEM IND

Inventor： FUKUSHIMA ISAMU ,  TAKADA MASAKATSU

IPC: G11B7/26 ,  G11B7/24

Abstract: PURPOSE:To prevent the inclusion of bubbles, etc., by forming parts exposed with a resin in the outer and inner peripheral parts of substrates and subjecting the exposed resin parts to a heating treatment for 10 seconds to 10 minutes at 70 to 140 deg.C, then applying an adhesive thereto. CONSTITUTION:The parts exposed with the resin are formed in the outer and inner peripheral parts of the resin substrates on the side provided with the recording layers. The exposed resin parts are subjected to the heating treatment for 10 seconds to 10 minutes at 70 to 140 deg.C, more preferably 80 to 130 deg.C and the adhesive is applied thereon. The exposed parts are thus adhered. Since the adhesive has the viscosity as high as 100 to 5,000 poises at 20 deg.C viscosity and, therefore, bubbles are often intruded into the adhesive. The adhesive is preferably used after the adhesive is subjected to vacuum defoaming prior to application at the time of use. The coating is executed by a method for setting an adhesive discharge nozzle in a specified radial position to one of the stuck substrate surfaces and applying and forming the adhesive to a doughnut shape so as not to generate the bubbles on the circumference, while rotating the substrate, then superposing the other substrate on the coated substrate and sticking the substrates to each other. The extremely stable and good optical recording medium is obtd. in this way.

公开(公告)号：JPH03212833A

公开(公告)日：1991-09-18

申请号：JP787490

申请日：1990-01-17

Applicant: MITSUBISHI CHEM IND

Inventor： FUKUSHIMA ISAMU ,  SHIROSAKA YOSHIYUKI ,  WAKABAYASHI MITSUGI

IPC: G11B11/10 ,  G11B11/105

Abstract: PURPOSE:To improve reliability of mechanical characteristics, etc., by heating the coated surfaces of two sheets of substrates prior to or during sticking in the case of sticking these substrates in such a manner that the surfaces coated with a hot melt adhesive agent face each other. CONSTITUTION:The coated surface of two sheets of the substrates, which are formed by successively depositing recording layers or the recording layers and protective layers on transparent substrates and applying the hot melt adhesive agent on the surfaces thereof are heated prior to or during the sticking at the time of forming the magneto-optical recording medium by sticking two sheets of the above-mentioned substrates in such a manner that the coated surfaces face each other. The hot melt adhesive agent is exemplified by a rubber system, polyester system, etc., and the heating temp. of the adhesive agent coated layer is preferably 40 to 100 deg.C. The center line average roughness on the surfaces of the coated layers is preferably adjusted to >=0.05mu and

公开(公告)号：JPS63277666A

公开(公告)日：1988-11-15

申请号：JP11239287

申请日：1987-05-11

Applicant: MITSUBISHI CHEM IND

Inventor： OTAKE MASAYUKI ,  FUKUSHIMA ISAMU

IPC: C07D307/33 ,  C07B63/02 ,  C07D307/32 ,  C11D7/50

Abstract: PURPOSE:To selectively remove impurities from a solvent in high efficiency, by adding an epoxy compound to a non-carboxylic acid solvent containing water or an impurity having close boiling point to the solvent to convert the impurity into a monohydroxyl compound and separating the impurity from the solvent by distrillation. CONSTITUTION:A non-carboxylic acid solvent (e.g. gamma-butyrolactone) containing an impurity (e.g. 4-9C carboxylic acid) having active hydrogen and close boiling point to the solvent is added with an epoxy compound (e.g. a glycidyl ether compound) in an amount of preferably >=1 equivalent, especially 1-100 equiva lent based on the existing impurity to convert at least a part of the impurity into a monohydroxyl compound (the boiling point of the produced compound is remarkably different from that of the impurity component having active hydrogen and contained in the solvent). The converted impurity is separated from the solvent by distillation to easily obtain a purified solvent. Since the monohydroxyl compound has high thermal stability, it generates no impurity again by distillation.

公开(公告)号：JPS5253817A

公开(公告)日：1977-04-30

申请号：JP12949675

申请日：1975-10-28

Applicant: MITSUBISHI CHEM IND

Inventor： KOIKE SAKAE ,  ISHII TOSHIKAZU ,  FUKUSHIMA ISAMU

IPC: C07C55/08 ,  C07C51/00 ,  C07C67/00 ,  C07C253/00 ,  C07C255/19

Abstract: PURPOSE:Inorganic cyano compounds contained in an aq alkaline solution of salts of cyanoacetic acid and/or of malonic acid are removed by the addition of H2 O2 in a molar amount 1 - 5 times the amount of said cyano compounds.

公开(公告)号：JPH0678305B2

公开(公告)日：1994-10-05

申请号：JP1130588

申请日：1988-01-21

Applicant: MITSUBISHI CHEM IND

Inventor： OOTAKE MASAYUKI ,  FUKUSHIMA ISAMU ,  FUJITA KOICHI

IPC: C07D207/267

公开(公告)号：JPH03232134A

公开(公告)日：1991-10-16

申请号：JP2803390

申请日：1990-02-07

Applicant: MITSUBISHI CHEM IND

Inventor： FUKUSHIMA ISAMU ,  SHIROSAKA YOSHIYUKI ,  WAKABAYASHI MITSUGI ,  OTA TAKAYUKI ,  KASAI ATSUSHI

IPC: G11B11/10 ,  C09J175/00 ,  C09J175/04 ,  G11B7/24 ,  G11B11/105

Abstract: PURPOSE:To obtain such an optical recording medium having good workability, no slipping of disks at high temp. disks, or no increase of defect by using a specified reactive hot-melt adhesive for an adhesive to bond optical recording medium bodies. CONSTITUTION:Two substrates each having a recording layer, reflecting layer and org. protective layer, etc., are stuck together with a reactive hot-melt adhe sive. Namely, this adhesive is a reactive hot-melt type one essentially comprising urethane prepolymers having isocyanate groups at the molecule end. The adhe sive is prepared by the reaction of polyisocyanate and a polyol component comprising 95 - 50 wt.% polyhydroxy hydrocarbon polymers having 600 - 20000 number average mol. weight, 1 - 8 average hydroxyl groups in one molecule, and