Patents Assigned to Mitsui
  • Polyethylene composition
    Patent number: 4792588
    Abstract: A polyethylene composition having excellent melt moldability which substantially comprises an ultrahigh-molecular-weight polyethylene having a molecular weight of, for example, at least about 1,650,000 and a low-molecular-weight to high-molecular-weight polyethylene having a molecular weight of, for example, about 1500 to about 360,000. The composition is produced by a multi-stage polymerization process involving a step of producing the ultrahigh-molecular-weight polyethylene and a step of producing the low-molecular-weight to high-molecular-weight polyethylene.
    Type: Grant
    Filed: April 17, 1987
    Date of Patent: December 20, 1988
    Assignee: Mitsui Petrochemical Industries, Ltd.
    Inventors: Michiharu Suga, Hideo Ishikawa, Yoshinori Akana, Junichi Yoshitake, Masayuki Kondoh
  • High-refractivity plastic lens resin formed from a polyisocyanate and a polythiol
    Patent number: 4791185
    Abstract: Disclosed herein is a colorless transparent plastic lens having high refractivity and low dispersion. The lens is light, has heat resistance sufficient for post processing, and is excellent in grinding machinability and impact resistance. It is made of a sulfur-containing urethane resin, which is a polymer of a specific polythiol and a particular polyisocyanate of at least bifunctionality.
    Type: Grant
    Filed: November 5, 1987
    Date of Patent: December 13, 1988
    Assignee: Mitsui Toatsu Chemicals, Incorporated
    Inventors: Yoshinobu Kanemura, Katsuyoshi Sasagawa, Masao Imai, Teruyuki Nagata, Nobuyuki Kajimoto
  • Transportation method of synthetic rubber chips
    Patent number: 4789272
    Abstract: Upon transportation of synthetic rubber chips through a piping or by means of a conveyor, 2 wt. %-50 wt. % based on the weight of the synthetic rubber chips of steam of 160.degree. C. or lower, water or both steam of 160.degree. C. or lower and water is added to the synthetic rubber chips upon their transportation.
    Type: Grant
    Filed: March 17, 1987
    Date of Patent: December 6, 1988
    Assignees: Mitsui Toatsu Chemicals, Incorporated, Toyo Engineering Corporation
    Inventors: Tetsuyuki Matsubara, Norifumi Ito, Mune Iwamoto, Toshihiko Ando
  • Process for the correction of curls of flexible metal clad laminate and for the improvement of its dimensional stability
    Patent number: 4788846
    Abstract: A long flexible metal clad laminate, which has a thin aromatic polyimide film formed on a long metal foil, is caused to slide under tension, along its length, on curved surfaces of four bars arranged at specific positions, so that its curls are corrected and its dimensional stability is improved.
    Type: Grant
    Filed: October 27, 1987
    Date of Patent: December 6, 1988
    Assignee: Mitsui Toatsu Chemicals, Incorporated
    Inventors: Moritsugu Morita, Kazuo Miyazaki
  • Coating resin composition with high number of imino groups
    Patent number: 4789707
    Abstract: There is disclosed a coating resin composition which contains as a crosslinking agent a melamine-formaldehyde resin which permits a paint to cure at low temperatures, permits a paint to form a coating film flexible enough for the fabrication of the coated substrate, gives off only a small amount of formaldehyde at the time of paint application, and makes it possible to increase the solids content in a paint. The melamine-formaldehyde resin is a mixed alkyl etherified methylol melamine resin, and the other composition-constituting component is an alkyd resin, polyester resin, or vinyl copolymer.
    Type: Grant
    Filed: March 2, 1987
    Date of Patent: December 6, 1988
    Assignees: Mitsui-Cyanamid Ltd., Nippon Paint Co., Ltd.
    Inventors: Tsutomu Nishimura, Yasuo Saito, Kenji Shindo, Kazutoshi Abe
  • Lubricant
    Patent number: 4787993
    Abstract: This invention provides lubricants which perform stable operation even at high temperatures and under heavy loading. The lubricants are prepared by dispersing at least one of finely powdered resin selected from aromatic resin and polyimide resin into the fluid fats and oils. The flowable fats and oils may further contain molybdenum disulfide, organic molybdenum, boron nitride, or PTFE.
    Type: Grant
    Filed: July 2, 1987
    Date of Patent: November 29, 1988
    Assignee: Mitsui Toatsu Chemicals, Incorporated
    Inventor: Taizo Nagahiro
  • Hydraulic cement-based composition for dip coating of steel and iron articles
    Patent number: 4787936
    Abstract: The inventive cement-based composition is useful as a coating material for corrosion-resistant protection on steel and iron surfaces. The composition is basically a polymer cement composition prepared by compounding a hydraulic cement with an aqueous emulsion of a polymeric constituent but characteritically the inventive composition is prepared by adding an aqueous emulsion of a hydrocarbon solvent such as kerosene containing a combination of surface active agents, i.e. oil-soluble non-ionic, water-soluble non-ionic and water-soluble cationic ones, and a saccharide compound such as glucose. By virtue of the unique formulation, the composition has a greatly extended pot-life suitable for coating works of, for example, steel rods and pipes by the dip coating method.
    Type: Grant
    Filed: July 27, 1987
    Date of Patent: November 29, 1988
    Assignees: Zairyo Kagaku Kenkyusho Co., Ltd., Mitsui Engineering & Shipbuilding Co., Ltd.
    Inventors: Kiyoshi Suzuki, Toshiaki Murata, Isao Nakata
  • Preparation process of heat-resistant polymers from polycarboxylic acids or anhydrides in the presence of an alkali metal fluoride and quaternary onium salt
    Patent number: 4785069
    Abstract: Disclosed herein is a process for preparing heat-resistant polymers by reacting an organic polyisocyanate with one or more compounds selected from the group consisting of organic polycarboxylic acids and organic polycarboxylic acid anhydrides in the presence of an alkali metal fluoride or an alkali metal fluoride combined with a quaternary onium salt as a catalyst.
    Type: Grant
    Filed: December 29, 1987
    Date of Patent: November 15, 1988
    Assignee: Mitsui Toatsu Chemicals, Incorporated
    Inventors: Masahiro Kouno, Akihiro Yamaguchi, Masanori Osawa, Kohei Shizuka, Hiromi Nakano, Kazumi Mizutani
  • Thermoplastic elastomer composition
    Patent number: 4785045
    Abstract: A thermoplastic elastomer composition composed of a partially crosslinked product of a blend consisting mainly of (a) 80 to 10 parts by weight of a peroxide-crosslinkable olefinic copolymer rubber, (b) 10 to 80 parts by weight of a peroxide-crosslinkable polyolefin resin having specific properties and (c) 50 to 10 parts by weight of a peroxide-decomposable polyolefin resin, the total amount of (a)+(b)+(c) being 100 parts by weight, the crosslinked product is obtained by dynamically heat-treating said blend in the presence of (d) an organic peroxide. The thermoplastic elastomer has excellent film formability, and is useful as a waterproof sheet.
    Type: Grant
    Filed: January 20, 1987
    Date of Patent: November 15, 1988
    Assignee: Mitsui Petrochemical Industries, Ltd.
    Inventors: Katsuyoshi Yonekura, Akira Uchiyama, Akira Matsuda
  • Method for the production and use of ultrapure water and apparatus therefor
    Patent number: 4784772
    Abstract: Ultrapure water are produced and used by subjecting deionized water, which has been obtained from a deionization step making use of an ion-exchange resin, successively to a sterilization treatment, an activated carbon treatment, an ion-exchange resin treatment and a permeable membrane treatment. The water is fed from each of the steps of the treatments after at least the sterilization tretment (inclusive) to the next step through first piping made of a crystalline polyether ether ketone resin having a recurring unit of the following formula: ##STR1## The thus-produced ultrapure water is then fed through second piping, which is also made of the crystalline polyether ether ketone resin, to and through a use system of the ultrapure water.
    Type: Grant
    Filed: June 16, 1987
    Date of Patent: November 15, 1988
    Assignee: Mitsui Toatsu Chemicals, Incorporated
    Inventors: Yoshihisa Gotoh, Toshihiko Tutumi, Toshiaki Takahashi, Katsuhiko Ito
  • Process for preparing cyclohexanonecarboxylic acid compounds
    Patent number: 4785132
    Abstract: A process for preparing cyclohexanonecarboxylic acid compounds by catalytically hydrogenating the corresponding hydroxybenzoic acid compounds in a secondary alcohol or tertiary alcohol solvent.
    Type: Grant
    Filed: March 25, 1987
    Date of Patent: November 15, 1988
    Assignee: Mitsui Toatsu Chemicals, Incorporated
    Inventors: Tohru Miura, Teruyuki Nagata, Hideki Mizuta
  • Linear salicylic acid copolymers and their metal salts, production process thereof, color-developing agents comprising metal-resins of the copolymers
    Patent number: 4783521
    Abstract: Disclosed herein are novel linear copolymers having weight average molecular weight of 500-30,000 and comprising structural units represented by the following formulae (I), (II), (III) and (IV): ##STR1## wherein R.sub.1, R.sub.2 and R.sub.3 mean individually an alkyl group having 4 or fewer carbon atoms and R.sub.4 denotes an alkyl, cycloalkyl, aralkyl or phenyl group, and multivalent metal salts thereof in each of which the multivalent metal forms the multivalent metal salt between carboxyl groups within the same molecule of the copolymer or between different molecules of the copolymer; color-developing agents comprising multivalent metal-modified resins of the copolymers; and color-developing sheets obtained by coating the color-developing agents on their surfaces.
    Type: Grant
    Filed: January 16, 1987
    Date of Patent: November 8, 1988
    Assignee: Mitsui Toatsu Chemicals, Incorporated
    Inventors: Akihiro Yamaguchi, Keizaburo Yamaguchi, Yoshimitsu Tanabe, Makoto Asano, Masaru Wada
  • Processes for preparing hydroxynaphthalenes
    Patent number: 4783557
    Abstract: Disclosed in accordance with the present invention are processes for the preparation of hydroperoxides and/or carbinols by liquid phase oxidation of secondary alkyl-substituted naphthalenes with molecular oxygen, wherein the oxidation reaction is carried out by dissolving in the reaction mixture containing the secondary alkyl-substituted naphthalenes at least 0.5 ppm in terms of metal, based on the starting secondary alkyl-substituted naphthalenes, of at least one compound of metal selected from the group consisting of palladium and gold, said metal compound being soluble in the reaction mixture of the secondary alkyl-substituted naphthalenes.
    Type: Grant
    Filed: September 10, 1987
    Date of Patent: November 8, 1988
    Assignee: Mitsui Petrochemical Industries, Ltd.
    Inventors: Yutaka Haneda, Sadao Yoshimoto, Hisaya Miki, Masaaki Yasuda, Shintarou Araki, Masatoshi Nitabaru
  • Novel polyethylene synthetic pulp
    Patent number: 4783507
    Abstract: Disclosed is a novel polyethylene synthetic pulp giving synthetic paper which may be heat-treated with a heating apparatus attached to a conventional papermaking machine. The polyethylene synthetic pulp comprises fibers of polyethylene which has an MFR (Melt Flow Ratio) of 0.1 to 3,000 g/10 min., and the portion with a low melting point thereof, which melts at a temperature of 95.degree. C. or lower when measured with a DSC (Differential Scanning Calorimeter), is at least 20% by weight, preferably, 40% to 70%.
    Type: Grant
    Filed: September 12, 1984
    Date of Patent: November 8, 1988
    Assignee: Mitsui Petrochemical Industries, Ltd.
    Inventors: Teruo Tokunaga, Masahiro Sugi
  • Lightweight paper and process for producing same
    Patent number: 4783240
    Abstract: A lightweight paper having a superior opacity and printing opacity is provided, which lightweight paper comprises dry pulp, 0.015 to 1.2% by weight based on the pulp of an alumina polymer and 0.5 to 30% by weight based on the pulp of a coaggregate formed from agglomerated particles of urea-formal-dehyde polymer (A) and agglomerated particles of hydrated silicic acid (B) in a ratio of (A):(B) of 5:95 to 95:5.
    Type: Grant
    Filed: October 16, 1986
    Date of Patent: November 8, 1988
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Akio Kurokawa, Naoyuki Ifuku, Kenzo Seita, Youzi Nagata
  • Method of producing L-serine
    Patent number: 4782021
    Abstract: This invention is a method of producing L-serine by causing glycine to react with formaldehyde by using the culture solution or the microbe cells of a microorganism belonging to the genus Escherichia, having the ability of producing serine hydroxymethyltransferase and not having the practical ability of producing L-serine from glycine alone or enzymatic matter obtained through the treatment of the above culture solution or microbe cells.In this invention, the yield of L-serine can be increased either by carrying out the reaction while maintaining aldehyde concentration at 20 mM or below or by using microbe cells of the aforementioned microorganism after they are caused to contact glycine.
    Type: Grant
    Filed: February 5, 1985
    Date of Patent: November 1, 1988
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Kenichi Ishiwata, Nobuyoshi Makiguichi, Hideki Kawashima, Tadashi Suzuki, Masami Imadegawa
  • Difluorobromomethoxyphenyl derivative and miticide comprising said derivative as active ingredient
    Patent number: 4782094
    Abstract: A difluorobromomethyoxyphenyl derivative of the general formula ##STR1## wherein A represents an oxygen atom or a methylene group, and Y represents a hydrogen or fluorine atom. A miticide comprising the above derivative as an active ingredient is also provided.
    Type: Grant
    Filed: March 11, 1987
    Date of Patent: November 1, 1988
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Satoshi Numata, Kouji Kitajima, Kenji Kodaka, Yukiharu Fukushi, Shiroh Shiraishi, Masahiko Nakamura, Masayuki Ooka
  • Isoquinoline derivatives
    Patent number: 4782154
    Abstract: The isoquinoline derivatives represented by the following general formula (I) are useful as cardiotonics having high cardiotonic activity and low toxicity: ##STR1## where R.sub.1 represents a lower C.sub.1 -C.sub.4 alkyl group or cyclopropyl group,R.sub.2 represents formyl group, lower C.sub.1 -C.sub.4 alkanoyl group and benzoyl group, lower C.sub.1 -C.sub.4 alkyl group, lower C.sub.1 -C.sub.4 alkenyl group, lower C.sub.1 -C.sub.4 hydroxy substituted alkyl group, C.sub.1 -C.sub.4 perfluoroalkyl group andR.sub.3 represents 4-pyridyl group or 2-pyridyl group respectively,and the therapeutically acceptable salts thereof are also useful as cardiotonics.
    Type: Grant
    Filed: July 17, 1987
    Date of Patent: November 1, 1988
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Tatsuo Kaiho, Seitaro Kajiya, Kengo Otsuka, Masahiko Maruyama, Makoto Hirayama
  • Preparation process of .alpha.-L-aspartyl-L-phenylalanine methyl ester or hydrochloride thereof
    Patent number: 4780561
    Abstract: Disclosed herein is a process for preparing .alpha.-L-aspartyl-L-phenylalanine methyl ester or its hydrochloride from 5-benzyl-3,6-dioxo-2-piperazine acetic acid or its methyl ester, prepared without using L-penylalanine methyl ester which involves problems in its stability, as a raw material. Specifically, the process comprises: bringing 5-benzyl-3,6-dioxo-2-piperazine acetic acid in the presence of methanol or 5-benzyl-3,6-dioxo-2-piperazine acetic acid methyl ester in the presence or absence of methanol into contact with hydrochloric acid; isolating the thereby deposited .alpha.-L-aspartyl-L-phenylalanine methyl ester hydrochloride; and neutralizing said hydrochloride with an alkali as required. Preparation processes of 5-benzyl-3,6-dioxo-2-piperazine acetic acid or its methyl ester are also disclosed.
    Type: Grant
    Filed: December 9, 1987
    Date of Patent: October 25, 1988
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Ryuichi Mita, Takeshi Oura, Toshio Katoh, Chojiro Higuchi, Akihiro Yamaguchi
  • Sulfur-containing polyurethane base lens resin
    Patent number: 4780522
    Abstract: A sulfur-containing polyurethane base lens resin is obtained by reacting one or more isocyanate compounds, which have two or more NCO groups, with one or more OH-containing compounds, which have two or more OH groups, in such proportions that the molar ratio of NCO groups to OH groups ranges from 0.5 to 1.5. At least one of said one or more OH-containing compounds contains one or more sulfur atoms in the molecule thereof. The total content of sulfur atoms in all OH-containing compounds is 20 wt. % or higher.
    Type: Grant
    Filed: March 4, 1987
    Date of Patent: October 25, 1988
    Assignee: Mitsui Toatsu Chemicals, Incorporated
    Inventors: Nobuyuki Kajimoto, Akihiro Tamaki, Teruyuki Nagata