Patents Assigned to Mitsui
  • Patent number: 4966961
    Abstract: The present invention relates to polymaleimide compounds having the following chemical structure: ##STR1## wherein n represents an integer of from 0 to about 50 and to a process for preparing the same.
    Type: Grant
    Filed: May 15, 1989
    Date of Patent: October 30, 1990
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Yoshimitsu Tanabe, Keizaburo Yamaguchi, Tatsuhiro Urakami, Akihiro Yamaguchi
  • Patent number: 4966805
    Abstract: The invention relates to a heat-shrinkable polystyrene-base foamed sheet prepared by laminating a heat-shrinkable polystyrene-base foamed sheet and a heat-shrinkable polystyrene-base film with a polyurethane-base adhesive wherein printing is applied to the laminating surface of the sheet and/or the film.
    Type: Grant
    Filed: March 20, 1990
    Date of Patent: October 30, 1990
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Hiroshi Ezawa, Takayuki Watanabe, Hiroaki Tsushima, Zyuzo Nishiba
  • Patent number: 4966929
    Abstract: Disclosed is a damping member comprising, as main components, a petroleum resin, asphalt and mica. By selecting and using mica as the filler and incorporating mica in an amount smaller than the amount of asphalt, the adhesion follow-up property to a substrate can be improved.This damping material can be attached simply and assuredly to a substrate having a curved surface, such as a tube or pipe, an air-conditioning duct or a part of a building or vehicle by heat-pressing or heat-fusion-bonding, and a product having an excellent damping effect is provided.
    Type: Grant
    Filed: July 18, 1989
    Date of Patent: October 30, 1990
    Assignees: Mitsui Petrochemical Ind., Ltd., NEC Environment Engineering, Ltd.
    Inventors: Toru Tomoshige, Yasumasa Fujii, Youhei Suzuki, Kenji Yokoyama, Yoshio Iida
  • Patent number: 4966790
    Abstract: According to the present invention, a coat is formed by applying a coating composition comprising an epoxy resin obtained by a bisphenol represented by the formula: ##STR1## wherein R.sub.1 and R.sub.2 represent a hydrogen atom or an alkyl group containing from 1 to 3 carbon atoms and a curing agent, to a substrate; and thereafter contactings the resulting coat with a liquid such as warm water or hot water in a one stage or multistage process. The thus formed coat is excellent in properties such as heat resistance, particularly erosion resistance adhesive properties and resistance to leaching of organic constituents contained in the coat exposed to hot water.
    Type: Grant
    Filed: November 10, 1988
    Date of Patent: October 30, 1990
    Assignee: Mitsui Petrochemical Industries, Ltd.
    Inventors: Hiroshi Iizuka, Tadao Iwata, Shuichi Ishiwata
  • Patent number: 4966968
    Abstract: Discloses indan derivatives represented by the general formula [1] ##STR1## wherein R is a lower alkoxy group, a phenoxy group, ##STR2## whereupon R.sup.1 and R.sup.2 are, respectively, a hydrogen atom, a lower alkyl, lower alkenyl, phenyl, or phenyl group substituted by halogen atoms, or a monopholino group.The indan derivatives demonstrated satisfactory results in respect of a weeding effect and safety in practical use.
    Type: Grant
    Filed: November 15, 1989
    Date of Patent: October 30, 1990
    Assignee: Mitsui Petrochemical Industries, Ltd.
    Inventors: Isao Hashimoto, Keiichi Yokoyama, Takumi Kitahara
  • Patent number: 4966813
    Abstract: A reflection-preventive layer composed of a specific polyfluoro(meth)acrylate is formed on one or both of the surfaces of a transparent film of a cellulose derivative. In this reflection-preventive pellicle film, the minimum light transmission in wavelengths of 350 to 450 nm is improved and the average light transmission is improved, and the adhesion of the reflection-preventive layer to the cellulose derivative layer is excellent.
    Type: Grant
    Filed: July 11, 1988
    Date of Patent: October 30, 1990
    Assignee: Mitsui Petrochemical Industries, Ltd.
    Inventors: Tokinori Agou, Hitomi Matsuzaki, Masahide Tanaka, Takamasa Tsumoto, Masaaki Kawasaki, Takami Nishikawa, Shuji Minami
  • Patent number: 4966766
    Abstract: A crude drug ingredient having bactericidal activity incorporated into a curable composition comprising a (meth)acrylate type monomer, a polymerization initiator and if necessary a filler to formulate the ingredient into the drug having sustained release property. The curable composition containing the crude drug ingredient is applied to a defective part of a tooth or an artificial gum for preventing dental diseases such as carious tooth, pyorrhea alveolaris, and the like.
    Type: Grant
    Filed: February 12, 1990
    Date of Patent: October 30, 1990
    Assignee: Mitsui Petrochemical Industries, Ltd.
    Inventors: Mitsuru Atsuta, Takeshi Sakashita, Ryoichi Miyamoto, Yukinori Tanimura, Saburo Fuji
  • Patent number: 4965263
    Abstract: This invention relates to pyridazinone derivatives of the general formula: ##STR1## [wherein R.sup.1 stands for a hydrogen atom or a lower alkyl group; R.sup.2 for a hydrogen atom or a lower alkyl group; and A for (i) a ring selected from a benzene ring, a furan ring, a thiophene ring and a pyridine ring (on which ring 1-3 substituents or atoms selected from amino groups, nitro groups, lower alkanoylamino groups, hydroxyl groups, lower alkanoyloxy groups, sulfamoyl groups and halogen atoms may be present), or (ii) a grouping of the formula: ##STR2## (wherein R.sup.3 stands for a hydrogen atom, a lower alkyl group, a phenyl(lower)alkyl, a hydroxyphenyl(lower)alkyl group, a lower alkylmercapto(lower)alkyl group, a benzylmercapto(lower)alkyl group, a guanidino(lower)alkyl group, a nitroguanidino(lower)alkyl group, an indolyl(lower)alkyl group, a carbamoyl(lower)alkyl group or a carboxy(lower)alkyl group, R.sup.4 for a hydrogen atom or a lower alkyl group, R.sup.
    Type: Grant
    Filed: February 14, 1989
    Date of Patent: October 23, 1990
    Assignee: Mitsui Toatsu Kagaku Kabushiki Kaisha
    Inventors: Takashi Nishina, Joji Kamiya, Yasuhito Tanaka, Tsutomu Katakami, Nobuyuki Fukazawa, Hajime Iizuka, Takuo Nakano
  • Patent number: 4965319
    Abstract: Provided herein a polymer composition which comprises from 50 to 85 parts by weight of an ethylene-type ionomer resin (A), from 10 to 39 parts by weight of a partially crosslinked olefin-type thermoplastic elastomer (B) and from 1 to 15 parts by weight of an ethylene-alpha-olefin copolymer rubber (C). The proposed composition is excellent in scratch resistance, adhesion to metals, resistance to heat deformation, flexibility, antibleeding property of mineral oil softener contained and low surface gloss.
    Type: Grant
    Filed: June 2, 1989
    Date of Patent: October 23, 1990
    Assignee: Du Pont-Mitsui Polychemicals Co., Ltd.
    Inventor: Manabu Kawamoto
  • Patent number: 4963653
    Abstract: A sialic acid-bonded octapeptide represented by the following general formula (I): ##STR1## wherein R represents a hydrogen atom or an acetyl group; and R' represents a lower alkyl group, an aralkyl group, a hydrogen atom or an alkali metal atom, is herein disclosed. The peptide chain of the sialic acid-bonded octapeptide is constituted by 8 amino acid molecules on the C-terminus side of FTS and the compounds represented by formula (I) can be obtained by bonding sialic acid to the amino terminus of the peptide chain according to condensation. These octapeptides show excellent physiological activity comparable to FTS and a half life in blood longer than that of FTS and it is expected that the affinity of the peptide to lymphocytes is also enhanced. Thus they can effectively be used as medicines for treating the lowering and abnormality of functions of the thymus.
    Type: Grant
    Filed: June 28, 1989
    Date of Patent: October 16, 1990
    Assignees: Mect Corporation, Mitsui Toatsu Chemical, Inc.
    Inventors: Yoshitaka Nagai, Shohei Shibayama, Masaaki Numata, Shoji Yoshimura, Makoto Tanaka, Masayoshi Ito, Akira Awaya, Hisashi Kobayashi, Hayao Abe, Yusaku Ishizuka, Tomoya Ogawa
  • Patent number: 4963449
    Abstract: There are here provided a novel tetraphenylthiophene derivative represented by the general formula ##STR1## wherein AM is a tertiary amino group, each of l, m and n is the integer 0 or 1 and l.gtoreq.m.gtoreq.n are useful as the charge-transporting material in an electrophotographic photoreceptor having an electrically conductive base and a photosensitive layer thereon containing a charge-transporting material and a charge-generating material, which preferably is an azo compound.
    Type: Grant
    Filed: November 17, 1988
    Date of Patent: October 16, 1990
    Assignee: Mitsui Toatsu Chemicals, Incorporated
    Inventors: Eishi Tanaka, Tsutomu Nishizawa, Yasuyuki Yamada, Hisato Itoh, Akihiro yamaguchi, Masakatsu Nakatsuka
  • Patent number: 4963456
    Abstract: Electrophotographic toner is provided which contains 30-80% by weight of a polymer per total weight of a resin included in the toner, said polymer is obtained by continuously feeding a vinyl monomer, a polymerization initiator and a solvent into a system of 190.degree.-230.degree. C. to conduct polymerization under a liquid state, and said polymer is a vinyl polymer having a number average molecular weight of 1,000-5,000 and a glass transition temperature of 40.degree.75.degree. C. The preparation method of the electrophotographic toner is also provided. The toner is excellent in the fixing ability at high duplication speed and lower temperatures.
    Type: Grant
    Filed: February 22, 1989
    Date of Patent: October 16, 1990
    Assignee: Mitsui Toatsu Chemicals, Incorporated
    Inventors: Masaaki Shin, Nobuhiro Hirayama, Keiichi Ishikawa, Akira Misawa
  • Patent number: 4962241
    Abstract: The process of the present invention for producing dihydroxynaphthalenes comprises hydrolyzing a diacyloxynaphthalene in a water-containing solvent in the presence of an acid catalyst. The use of an acid as a hydrolyzing catalyst enables dihydroxynaphthalenes to be obtained with high purity and in high yield.
    Type: Grant
    Filed: February 3, 1989
    Date of Patent: October 9, 1990
    Assignee: Mitsui Petrochemical Industries, Ltd.
    Inventors: Masaaki Yasuda, Hisaya Miki
  • Patent number: 4962200
    Abstract: A novel nitrogen-containing compound capable of preventing hardening of blood vessels by controlling formation of peroxide lipids in cell membranes, which is valuable as an anti-arteriosclerotic agent, is disclosed.
    Type: Grant
    Filed: April 29, 1988
    Date of Patent: October 9, 1990
    Assignee: Mitsui Petrochemical Industries, Ltd.
    Inventors: Noriaki Kihara, Ikuo Tomino, Hiroaki Tan, Takafumi Ishihara
  • Patent number: 4962222
    Abstract: .alpha.-L-Aspartyl-L-phenylalanine methyl ester having low hygroscopicity is prepared by bringing a cake of .alpha.-L-aspartyl-L-phenylalanine methyl ester, which cake has been obtained by solid-liquid separation through a desired preparation process of .alpha.-L-aspartyl-L-phenylalanine methyl ester, into contact with an organic solvent of uniform phase so as to treat the cake with the organic solvent, subjecting the resulting mixture of the cake and organic solvent to solid-liquid separation to obtain a cake, and then drying the last-mentioned cake at a temperature not higher than 60.degree. C. The organic solvent is dry or contains water in an amount up to 30 wt.%.
    Type: Grant
    Filed: January 25, 1989
    Date of Patent: October 9, 1990
    Assignee: Mitsui Toatsu Chemicals, Incorporated
    Inventors: Ryuichi Mita, Toshio Katoh, Chojiro Higuchi, Takeshi Oura, Akihiro Yamaguchi
  • Patent number: 4960958
    Abstract: The catalysts for use in pyrolytic decomposition of the phenol distillation residue in accordance with the present invention are used in pyrolytically decomposing a distillation residue resulting from the separation by distillation of cumene, phenol and acetone from a reaction mixture obtained by oxidizing cumene with molecular oxygen followed by acid cleavage, and the present catalysts are characterized by comprising oxygen containing metallic compounds having a particle diameter of 0.002-100 .mu.m.Furthermore, the processes for recovering useful substances from a phenol distillation residue containing the same in accordance with the present invention are characterized by allowing said phenol distillation residue to undergo pyrolytic reaction at a temperature of 200.degree.-350.degree. C., preferably 250.degree.-300.degree. C., in the presence of the above-mentioned oxygen containing metallic compound catalysts having a particle diameter of 0.002-100 .mu.
    Type: Grant
    Filed: September 22, 1989
    Date of Patent: October 2, 1990
    Assignee: Mitsui Petrochemical Industries, Ltd.
    Inventors: Tetsuo Imamura, Tatsuo Shirahata, Kichiro Shoji
  • Patent number: 4960538
    Abstract: Disclosed are near-infrared absorbents comprising 1,2-naphthalocyanine derivatives wherein the four naphthalene rings contained in the molecule independently have 1 to 6 substituents. Also disclosed is the use of these near-infrared absorbents in optical recording media, near-infrared absorption filters and display materials.
    Type: Grant
    Filed: October 20, 1988
    Date of Patent: October 2, 1990
    Assignees: Mitsui Toatsu Chemicals, Inc, Yamamoto Chemicals, Inc.
    Inventors: Hisato Itoh, Takahisa Oguchi, Katashi Enomoto, Masakatsu Nakatsuka, Tsutomu Nishizawa
  • Patent number: 4960852
    Abstract: Thermosetting resin compositions are provided which comprise aromatic bismaleimide derivatives, for example, 2,2-bis[4(3-maleimidephenoxy)phenyl]propane and diamine derivatives, for example, 4,4'-bis(3-aminophenoxy)biphenyl. Prepolymers are also prepared by conducting heat-treatment of said compositions. The compositions of this invention are used for thermoforming such as compression molding etc. as well as raw materials of adhesives and coatings. The compositions provide molded articles which are excellent, for example, impact strength, flexibility and high-temperature stability.
    Type: Grant
    Filed: February 1, 1989
    Date of Patent: October 2, 1990
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Norimasa Yamaya, Nobuhito Koga, Masahiro Ohta, Akihiro Yamaguchi
  • Patent number: 4960875
    Abstract: An external agent for application to the skin, such as a cosmetic, an ointment or a hair remover, comprises a liquid low-molecular-weight ethylenic copolymer having an ethylene content of 30 to 70 mole %, a number average molecular weight of 150 to 5,000, a Q value, as defined in the specification, of not more than 4, a standard deviation, as defined in the specification, of not more than 3, and a B value, as defined in the specification, of 1.0 to 1.5.
    Type: Grant
    Filed: August 1, 1989
    Date of Patent: October 2, 1990
    Assignee: Mitsui Petrochemical Industries, Ltd.
    Inventors: Tatsuo Kinoshita, Shuji Minami, Shigeru Kanzaki
  • Patent number: 4960581
    Abstract: The method for preparing a gaseous metallic floride is here disclosed which comprises reacting a metal or its oxide with a fluorine gas or nitrogen trifluoride gas, the aforesaid method being characterized by comprising the steps of mixing the metal or its oxide with a molding auxiliary comprising a solid metallic fluoride which does not react with fluorine and nitrogen trifluoride; molding the resulting mixture under pressure; and contacting the molded pieces with the fluorine gas or nitrogen trifluoride gas, while the molded pieces are heated.
    Type: Grant
    Filed: March 13, 1989
    Date of Patent: October 2, 1990
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Isao Harada, Yukihiro Yoda, Naruyuki Iwanaga, Toshihiko Nishitsuji, Akio Kikkawa