Patents Assigned to Mitsubishi Acetate Co., Ltd
  • Patent number: 4888147
    Abstract: A process for producing a cellulose acetate molding material which comprises dissolving cellulose diacetate in a mixed solvent of acetone and water to prepare a dope and then spinning or film forming the dope, wherein at least one compound selected from the group consisting of water-soluble salts and bases is added to the water to be used in preparation of the dope.
    Type: Grant
    Filed: October 7, 1988
    Date of Patent: December 19, 1989
    Assignees: Mitsubishi Rayon Co., Ltd., Mitsubishi Acetate Co., Ltd.
    Inventors: Naoki Mochida, Hiroaki Sawada
  • Patent number: 4826433
    Abstract: A stick absorber for the oral cavity comprising a bundle of fibers, the periphery of said bundle of fibers being wrapped with a water-permeable tape, and said tape being adhered at its joint with a binder. The stick absorber has high water absorbability and spacing effects, and does not release its constituent fibers into the oral cavity.
    Type: Grant
    Filed: June 16, 1987
    Date of Patent: May 2, 1989
    Assignees: Mitsubishi Acetate Co., Ltd., Uni-Charm Corp.
    Inventors: Takashi Sakai, Hiroshi Kitayama, Masamitu Yamamoto, Takashi Mino
  • Patent number: 4670953
    Abstract: A method and device for forming a warp beam of uniform diameter by feedback control of winding tension, in which a signal obtained from local winding tensions, each corresponding to a tension of a yarn at a certain widthwise position, are utilized for adjusting the position and width of a reed so that distribution of the warp on the beam is improved and an intra-beam diameter difference is compensated. One of the signals obtained from the local winding tensions is utilized for adjusting the rotational speed of rollers so that an inter-beam diameter difference is compensated. Thus, a warp beam without intra- or inter-beam diameter difference can always be produced.
    Type: Grant
    Filed: September 6, 1985
    Date of Patent: June 9, 1987
    Assignees: Mitsubishi Acetate Co. Ltd., Mitsubishi Rayon Company, Ltd.
    Inventors: Hisashi Kanda, Susumu Nario, Kazuhiko Morifuji, Yuzo Kawada, Takashi Sakai, Takeshi Kawada, Katsura Shimada, Mitsuo Tsuneda
  • Patent number: 4583560
    Abstract: A tobacco smoke filter includes a corrugated tape-like wrapping which, together with an outer perforated or otherwise air-permeable paper, defines a set of longitudinal grooves. Each of the grooves includes a blocking member, so as to inhibit direct smoke flow through the grooves and promote a ventilation effect. The blocking members in each groove are longitudinally staggered from one groove to the next to simplify the production of the device.
    Type: Grant
    Filed: July 7, 1983
    Date of Patent: April 22, 1986
    Assignees: Mitsubishi Acetate Co., Ltd, Japan Tobacco Inc.
    Inventors: Takashi Sakai, Kazuo Maeda, Masuo Kawabata, Mituo Kono
  • Patent number: 4488563
    Abstract: A filter plug having a dual structure comprising filter element A made from a crimped long filter tow in a form of a plug, filter element B, joined to said A, prepared by wrapping a core material consisting of a long fiber tow in a sheet-formed product having grooves which is formed from a material having an air permeability of 8 liters/minute or less and an air permeable wrapping paper and/or a wrapping paper with perforated openings on its periphery which is wrapping therein said filter elements A and B so that the outer grooves parts of the sheet-formed product pass through in the longer direction of the filter plug.
    Type: Grant
    Filed: April 29, 1982
    Date of Patent: December 18, 1984
    Assignees: Mitsubishi Acetate Co., Ltd., Mitsubishi Rayon Co., Ltd.
    Inventors: Kazuhiko Morifuji, Hirohumi Okura, Takashi Sakai
  • Patent number: 4357188
    Abstract: A method for manufacturing cigarette filters which have a well-stabilized shape in which acetate fibrous tows impregnated with carboxylic acid ester of polyol are formed into a predetermined shape, uniformly impregnated with water, and irradiated with microwave energy. Water is used during the application of microwave energy to enhance the absorption of microwave energy and hence heating of the filter. This causes the carboxylic acid ester of polyol to very rapidly disperse causing it to permeate into the acetate fiber to rapidly complete the stabilization and solidification of the filter.
    Type: Grant
    Filed: October 17, 1980
    Date of Patent: November 2, 1982
    Assignees: Mitsubishi Rayon Co., Ltd., Mitsubishi Acetate Co., Ltd.
    Inventors: Naoki Mochida, Kazuhiko Morifuji, Takashi Sakai
  • Patent number: 4252855
    Abstract: Surface-modified cellulose acetate filaments having a microporous structure located in the peripheral surface layer thereof are prepared by bringing non-modified cellulose acetate filaments which have an average degree of acetylation of 50 to 62% into contact with an organic solvent which is capable of dissolving or swelling the non-modified filaments and by rapidly evaporating the solvent from the filaments. The microporous structure causes the surface-modified filaments to exhibit a desirable silklike touch and an increased intensity in dye exhaustion of from 1.1 to 2.0 times that of the non-modified filaments.
    Type: Grant
    Filed: December 7, 1978
    Date of Patent: February 24, 1981
    Assignees: Mitsubishi Acetate Co., Ltd, Mitsubishi Rayon Co., Ltd.
    Inventors: Ryohei Noguchi, Seigi Suzuki, Yutaka Maeda, Koichi Minami