Patents Assigned to Mitsubishi Monsanto Chemical Company
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Patent number: 5298563Abstract: A process for preparing an impact resistant resin, which comprises a step of graft copolymerizing a monomer mixture comprising an aromatic vinyl monomer and a monomer copolymerizable therewith, to a butadiene rubber-like polymeric latex in the presence of a redox polymerization initiator; a step of coagulating the resulting graft copolymer latex by mixing an antioxidant thereto and adding an alkaline earth metal salt thereto; and a step of washing the coagulated product by a washing water having the pH adjusted to a level of at most 7.Type: GrantFiled: June 7, 1993Date of Patent: March 29, 1994Assignee: Mitsubishi Monsanto Chemical CompanyInventors: Narito Ishiga, Yoshihiko Takeda
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Patent number: 5225494Abstract: A graft copolymer resin composition having improved impact resistance, particularly at low temperature, obtained by emulsion-polymerizing an aromatic vinyl monomer and a vinyl cyanide monomer, optionally together with an ethylenically unsaturated monomer copolymerizable therein under specific conditions by the action of a polymerization initiator in the presence of a latex of a conjugated diene polymer under specific conditions.Type: GrantFiled: March 21, 1990Date of Patent: July 6, 1993Assignee: Mitsubishi Monsanto Chemical CompanyInventor: Narito Ishiga
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Patent number: 5194491Abstract: The invention relates to an improved process for producing a rubber-modified styrene resin, and a rubber-modified styrene resin composition resulting therefrom, such resin having improved mechanical strength, impact resistance and high gloss, such being accomplished by producing a rubber-modified styrene resin containing substantially no rubber particle having a density of not higher than 0.96 gm/cm.sup.3 at 25.degree. C.Type: GrantFiled: May 24, 1990Date of Patent: March 16, 1993Assignee: Mitsubishi Monsanto Chemical CompanyInventors: Takaaki Sakita, Minoru Uchida, Tetsuo Hayase, Hiromitsu Hatakeyama
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Patent number: 5153682Abstract: A high-mobility semiconductor device having GaAs/AlGaAs hetero junction of the present invention comprises a GaAs active layer and a GaAs contact layer, with a high-carrier concentration AlGaAs barrier layer interposed therebetween, so that the effective carrier concentration of the active layer can be increased and thus the thickness thereof can be reduced, resulting in an increase in the trans-conductance and improvement in the high frequency characteristics. Since the presence of the AlGaAs barrier layer enables selecting etching, such element characteristics as the plane uniformity and reproducibility can be improved.Type: GrantFiled: February 25, 1991Date of Patent: October 6, 1992Assignees: Mitsubishi Monsanto Chemical Company, Mitsubishi Kasei CorporationInventors: Hideki Goto, Masanori Kato, Tatsuhiko Kawakami
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Patent number: 5114521Abstract: A method for producing a sliding coupling, w hich comprises injecting a casting material comprising the following components (A) and (B) into a clearance between a bearing and a shaft fitted in and rotatably or reciprocatively supported by the bearing, wherein a primer is preliminarily applied to either the shaft or the bearing and a releasing agent is preliminarily applied to the other; followed by polymerization and curing to form a resin lining on the surface of the shaft or the bearing:(A) a .OMEGA.-lactam liquid containing a polymerization catalyst of an alkali metal or alkaline earth metal compound; and(B) a .OMEGA.-lactam liquid containing at least one polymerization initiator.Type: GrantFiled: April 6, 1990Date of Patent: May 19, 1992Assignees: Mitsubishi Monsanto Chemical Company, Toyota Jidosha Kabushiki KaishaInventors: Yo Isegawa, Takeshi Kito, Kimimasa Muryayama, Shoji Ikawa, Takahiro Iwase, Tutomu Sugiura, Atsuyuki Tsuzuki
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Patent number: 5103270Abstract: A double hetero type epitaxial wafer contains a single crystal substrate, first and second conductivity type clad layers which are opposite and are made of mixed crystal compounds of Group III-V which had an indirect transition type band structure, and an active layer made of a mixed crystal compound of Group III-V which has a direct transition type band structure and is interposed between the respective clad layers, wherein the first conductivity type clad layer has a refractive index smaller than that of the second conductivity type clad layer.Type: GrantFiled: November 27, 1989Date of Patent: April 7, 1992Assignees: Mitsubishi Monsanto Chemical Company, Mitsubishi Kasei CorporationInventors: Tadashige Sato, Toshio Ishiwatari, Hisanori Fujita
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Patent number: 5100720Abstract: A gas barrier laminated film comprising a thermoplastic film having a polar group and a thin silicon oxide layer formed on the one side of the thermoplastic film in which the bond energy of silicon in the silicon oxide layer varies along the direction of the thickness of the layer and becomes large in the vicinity of the plastic film. It has a high level of gas barrier properties for steam and oxygen and is suitable for a variety of packaging materials.Type: GrantFiled: October 5, 1988Date of Patent: March 31, 1992Assignee: Mitsubishi Monsanto Chemical Company LimitedInventors: Tsutomu Sawada, Shinichi Ohashi, Shigenobu Yoshida
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Patent number: 5068438Abstract: N-Alkyl-N'-phenyl-p-phenylenediamine particles, which are not easily broken during transportation or in a hopper and can be easily automatically metered, are prepared by a surface treating process wherein granulated N-alkyl-N'-phenyl-p-phenylenediamine particles are charged in a rotatable vessel and the vessel is then rotated at a temperature lower than the melting point of the N-alkyl-N'-phenyl-p-phenylenediamine, to cause the N-alkyl-N'-phenyl-p-phenylenediamine particles to freely flow.Type: GrantFiled: December 7, 1989Date of Patent: November 26, 1991Assignee: Mitsubishi Monsanto Chemical CompanyInventor: Katsumi Kobayashi
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Patent number: 5055152Abstract: The present invention relates to an easily separable laminated/perforated film for packings, that can seal the contents under transportation and storage situations and can be formed to the situation for communicating the container interior with the external side when it is to be used.This laminated/perforated film is the film which has bonded both the films in simulation by providing many perforations onto a formed film and by pressing another film which has been extruded from a film forming machine and which is still in a fused state against this perforated film, and this simulation bonding is to be achieved when the film in the fused state has invaded into the perforations of another film.Type: GrantFiled: November 29, 1989Date of Patent: October 8, 1991Assignees: Mitsubishi Monsanto Chemical Company, Nihon Tokkyo Kanri Company LimitedInventor: Hiromichi Inagaki
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Patent number: 5040044Abstract: According to the present invention, roughness are formed on the surface of III-V group compound semiconductor to prevent total reflection, and SiNx film is formed on rough surface. This makes it possible to increase external quantum efficiency by surface roughness. Further, bond strength is increased because SiNx film is furnished on the roughness. As the result, the detachment of SiNx film is prevented, moisture resistant property is improved, and service life of LED is extended by preventing oxidation.Type: GrantFiled: June 20, 1990Date of Patent: August 13, 1991Assignees: Mitsubishi Monsanto Chemical Company, Mitsubishi Kasei CorporationInventors: Masahiro Noguchi, Toshihiko Ibuka
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Patent number: 4997600Abstract: A thermoplastic sheet is prepared by (i) extruding a molten thermoplastic resin in the form of a sheet from a molding die; (ii) applying static charges to the extruded resin sheet from a first electrode whereby the charged resin sheet is pinned to the surface of an electrical insulating layer of a quenching roller to quench the resin sheet; (iii) peeling the quenched sheet from the surface of the quenching roller; and (v) applying electrostatic charges having a reverse polarity to that of the electrostatic charges from the first electrode to the exposed surface portion of the quenching roller from a second electrode. The quenching roller is made of an electrically earthed substrate and the electrical insulating layer formed on the surface of the substrate.Type: GrantFiled: May 23, 1989Date of Patent: March 5, 1991Assignee: Mitsubishi Monsanto Chemical Company, Ltd.Inventors: Tsuguo Okumura, Shinichi Ohashi, Hitoshi Matsuda, Kazuhisa Miyashita, Naomichi Yamagishi
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Patent number: 4916196Abstract: A process for producing a heat resistant resin composition, which comprises polymerizing by suspension polymerization a monomer mixture comprising from 30 to 80% by weight of an aromatic vinyl monomer, from 10 to 50% by weight of an N-substituted maleimide monomer, from 10 to 40% by weight of a vinyl cyanide monomer and from 0 to 30% by weight of other vinyl monomer copolymerizable therewith, characterized in that the polymerization reaction is initiated in the presence of a part of the monomer mixture and a part of a suspending agent in the suspension polymerization system prior to the initiation of the polymerization reaction, and then during the polymerization, the rest of the monomer mixture and the rest of the suspending agent are added to the polymerization system continuously or intermittently to complete the polymerization reaction.Type: GrantFiled: May 27, 1988Date of Patent: April 10, 1990Assignee: Mitsubishi Monsanto Chemical CompanyInventors: Yuji Aoki, Hiroaki Miyazaki
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Patent number: 4911966Abstract: An optical disk substrate made of a non-crystalline thermoplastic resin comprising from to 80 to 100% by weight of a vinyl cyclohexane polymer (A) containing at least 80% by weight of a vinyl cyclohexane component in the molecular chain and from 0 to 20% by weight of a vinyl aromatic polymer (B) and having a light transmittance of at least 85%, a water absorbance of at most 0.1% by weight and a double refraction of at most 50 nm.Type: GrantFiled: December 2, 1988Date of Patent: March 27, 1990Assignee: Mitsubishi Monsanto Chemical CompanyInventors: Masamitsu Murayama, Kanji Kasahara
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Patent number: 4902356Abstract: An epitaxial layer having a double-hetero structure is forming using an MOCVD process or an MBE process, and an epitaxial substrate is formed using an LPE process, thereby forming a substrate which exploits the distinguishing features of both processes. Since the MOCVD process or MBE process exhibits mixed-crystal ratio and film thickness controllability, excellent reproducibility and uniformity are obtained when forming the double-hetero structure on a compound semiconductor substrate. Since the growth process takes place under thermal non-equilibrium, the amount of impurity doping is raised to more than 10.sup.19 cm.sup.3. This is advantageous in terms of forming an electrode contact layer. With the LPE process, the material dissolved in the melt is grown epitaxially on the substrate by slow cooling, and the rate of growth is high. This process is suitable for forming the substrate after removal of the compound semiconductor substrate.Type: GrantFiled: January 19, 1989Date of Patent: February 20, 1990Assignees: Mitsubishi Monsanto Chemical Company, Mitsubishi Kasei CorporationInventors: Masahiro Noguchi, Hideki Gotoh, Kenji Shimoyama
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Patent number: 4879343Abstract: A heat and impact resistant composition comprising:(A) 5-89 parts by weight of a graft polymer prepared by graft polymerizing 30-75 parts by weight of a mixture of 30-80% of an aromatic vinyl monomer, 10-50% of an N-substituted maleimide monomer, 10-45% of a vinyl cyanide monomer and 0-30% of another copolymerizable vinyl monomer onto 25-70 parts by weight of a diene rubber (a);(B) 10-90 parts by weight of a copolymer obtained by polymerizing a mixture of 30-80% of an aromatic vinyl monomer, 10-50% of an N-substituted maleimide monomer, 10-40% of a vinyl cyanide monomer and 0-30% of another copolymerizable vinyl monomer, or (B') an imido group--containing adduct of a copolymer obtained by reacting a primary amine and/or ammonia with a copolymer obtained by polymerizing a mixture of 30-80% of an aromatic vinyl monomer, 5-50% of an alpha, beta-unsaturated dicarboxylic acid anhydride monomer and 0-40% of another copolymerizable vinyl monomer;(C) 1-45 parts be weight of a graft polymer made by graft polymerizingType: GrantFiled: August 5, 1988Date of Patent: November 7, 1989Assignee: Mitsubishi Monsanto Chemical CompanyInventors: Yuji Aoki, Hiroaki Miyazaki
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Patent number: 4753842Abstract: Disclosed is a heat-shrinkable biaxially drawn polyamide film which is formed from a homopolymer or copolymer of .epsilon.-caprolactam or a polyblend thereof, by a sequential biaxial drawing method and which has a density of 1.129 to 1.136 g/cm.sup.3 and an in-plane orientation index of 0.0535 to 0.0580. This film is prepared by the steps of drawing in the machine direction a substantially amorphous unoriented polyamide film at 45.degree. to 65.degree. C., a deformation rate of at least 10,000%/min and a draw ratio of 2.7 to 3.5 by a roll type longitudinal drawing method, gripping the ends of the film by tenter clips, drawing the film in the transverse direction at a film temperature not higher than 100.degree. C., an average deformation rate of 2,000 to 10,000%/min and a draw ratio of 3 to 5, and heat-treating the film at 125.degree. to 170.degree. C. while gripping the ends of the film by the tenter clips.Type: GrantFiled: April 11, 1986Date of Patent: June 28, 1988Assignee: Mitsubishi Monsanto Chemical CompanyInventors: Tsuguo Okumura, Kazuharu Abe, Kenji Mori
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Patent number: 4732684Abstract: A method for preventing the bulking of activated sludge, which comprises adding to the activated sludge a water-soluble cationic polymer obtained by a reaction of a dialkylamine, ammonia and epichlorohydrin, in an amount of from 0.05 to 25 parts by weight relative to 100 parts by weight of the dried solid content of the activated sludge.Type: GrantFiled: December 19, 1986Date of Patent: March 22, 1988Assignee: Mitsubishi Monsanto Chemical CompanyInventor: Kiyoharu Fujino
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Patent number: 4729831Abstract: A method for preventing the bulking of activated sludge, which comprises adding to the activated sludge a water-soluble cationic polymer obtained by a reaction of a dialkylamine with epichlorohydrin, in an amount of from 0.1 to 25 parts by weight relative to 100 parts by weight of the dried solid content of the activated sludge.Type: GrantFiled: December 16, 1986Date of Patent: March 8, 1988Assignee: Mitsubishi Monsanto Chemical CompanyInventor: Kiyoharu Fujino
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Patent number: 4726960Abstract: A medical material comprising a shaped article made of a soft vinyl chloride resin composition, a layer formed on the shaped article and composed essentially of crosslinked gelatin having good bio-compatibility with a living body, and an intermediate bonding layer firmly bonding the crosslinked gelatin layer to the shaped article.Type: GrantFiled: September 4, 1986Date of Patent: February 23, 1988Assignee: Mitsubishi Monsanto Chemical CompanyInventors: Tsutomu Sawada, Kyoji Yoshida, Shozo Takano, Masanori Fujikawa
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Patent number: 4713429Abstract: A method for producing by suspension polymerization a copolymer comprising a vinyl cyanide compound and an aromatic vinyl compound having excellent transparency, and uniform composition, and a content of the polymerized residue of vinyl cyanide compound in the range of from 50 to 85% by weight comprising the steps of: (a) carrying out initial charging of the total quantity of the vinyl cyanide compound and a partial quantity of the aromatic vinyl compound at a compositional ratio, wherein the content of the vinyl cyanide compound in the resulting copolymer attains an intended ratio within a range of from 50 to 85% by weight; (b) initiating the copolymerization reaction by adding a polymerization initiator having a decomposition half-life at 95.degree. C.Type: GrantFiled: June 27, 1986Date of Patent: December 15, 1987Assignee: Mitsubishi Monsanto Chemical CompanyInventor: Sadao Ikuma