Patents Assigned to Sekisui Plastics Co., Ltd.
  • Patent number: 8663797
    Abstract: A high-strength adhesive polymer gel comprising a polymer and polyhydric alcohol, wherein the polymer comprises a monopolymer of an acrylic monomer having an alkoxyalkyl group, or a copolymer of the acrylic monomer having an alkoxyalkyl group and another acrylic monomer which can be copolymerized with the acrylic monomer having an alkoxyalkyl group, and wherein the acrylic monomer having an alkoxyalkyl group makes up 50% by weight or more of a total amount of a polymerizable monomer.
    Type: Grant
    Filed: March 20, 2007
    Date of Patent: March 4, 2014
    Assignee: Sekisui Plastics Co., Ltd.
    Inventors: Hiroyoshi Tanaka, Shuichi Sasahara
  • Patent number: 8592494
    Abstract: A method for producing styrene-modified linear low-density polyethylene-based resin particles, which includes the steps of: dispersing 100 parts by weight of non-crosslinked linear low-density polyethylene-based resin particles which are polymerized using a metallocene compound as a catalyst and contain an inorganic nucleating agent, 50 to 800 parts by weight of a styrene-based monomer and 0.1 to 0.9 parts by weight of a polymerization initiator relative to 100 parts by weight of the styrene-based monomer into an aqueous suspension containing a dispersant; impregnating the polyethylene-based resin particles with the styrene-based monomer under heating the resulting dispersion at such a temperature that the styrene-based monomer does not substantially polymerize; and performing polymerization of the styrene-based monomer at a temperature of (T+10) to (T+35)° C. where T° C. is a crystallization peak temperature of the polyethylene-based resin particles.
    Type: Grant
    Filed: September 12, 2011
    Date of Patent: November 26, 2013
    Assignee: Sekisui Plastics Co., Ltd.
    Inventors: Hideyasu Matsumura, Tatsuya Matsugashita
  • Publication number: 20130310475
    Abstract: Expanded composite polystyrene-based resin particles having a plurality of cells and cell membranes separating the plurality of cells, said cell membranes including a polystyrene-based resin forming a continuous phase and polyacrylic acid alkyl ester-based resin fine particles dispersed in said continuous phase to form a dispersed phase, and said polystyrene-based resin being complexed with said polyacrylic acid alkyl ester-based resin fine particles, wherein said dispersed phase is present in the form of a plurality of layers in a cell membrane thickness direction in a cell membrane cross-section of said expanded composite polystyrene-based resin particles.
    Type: Application
    Filed: February 29, 2012
    Publication date: November 21, 2013
    Applicant: SEKISUI PLASTICS CO., LTD.
    Inventors: Yasutaka Tsutsui, Shingo Terasaki
  • Publication number: 20130289157
    Abstract: A composition for an adhesive hydrogel, comprising at least: a polymeric matrix former; water; and a polyhydric alcohol; the polymeric matrix former comprising at least: (a) (meth)acrylic acid, a (meth)acrylic acid derivative or a vinyl derivative having 2 carboxyl groups and 4 or 5 carbon atoms; (b) (meth)acrylamide or a (meth)acrylamide derivative; (c) N-vinyl-2-caprolactam and/or N-vinyl-2-valerolactam; and (d) a cross-linkable monomer, wherein the content percentage of the (b) in the composition for an adhesive hydrogel is 2 to 20% by weight.
    Type: Application
    Filed: August 12, 2011
    Publication date: October 31, 2013
    Applicant: SEKISUI PLASTICS CO., LTD.
    Inventors: Kaori Sato, Takaaki Hatori, Yasuhiro Fujiwara
  • Patent number: 8568750
    Abstract: A method for producing a deformed shaped particles comprising step of: absorbing a polymerizable vinyl type monomer contained in an aqueous emulsion in a seed particles and polymerizing an absorbed polymerizable vinyl type monomer, wherein the seed particles are a resin particles which are derived from a (meth)acrylic ester having an ester part containing at least an alkyl group with a number of carbon atoms of 3 or more and less than 6, and which have a weight average molecular weight of 150000 to 1000000 (measured by GPC: gel permeation chromatography) and the polymerizable vinyl type monomer contains 5 to 50 wt. % of a crosslinkable monomer to the entire amount of the polymerizable vinyl type monomer.
    Type: Grant
    Filed: March 26, 2010
    Date of Patent: October 29, 2013
    Assignee: Sekisui Plastics Co., Ltd.
    Inventor: Ryosuke Harada
  • Publication number: 20130230733
    Abstract: A process for producing resin particles includes a step in which a polymerizable mixture including a polymerizable monomer including at least one of a styrene-based monomer and a (meth)acrylic-based monomer, and a polymerization initiator is absorbed into seed particles in an aqueous medium, without using a dispersant, in the presence of an anionic surfactant not having a polyoxyethylene chain but having an alkyl group; and a step in which the polymerizable monomer is polymerized in an aqueous medium, without using a dispersant, in the presence of an anionic surfactant having a polyoxyethylene chain to thereby obtain resin particles. The resin particles include a resin derived from a polymerizable monomer including at least one of a styrene-based monomer and a (meth)acrylic-based monomer. The proportion by number of particles having a particle diameter in the range of from 80 to 120% of the volume-average particle diameter is 85% or more.
    Type: Application
    Filed: September 28, 2011
    Publication date: September 5, 2013
    Applicant: SEKISUI PLASTICS CO., LTD.
    Inventors: Masaaki Nakamura, Ryosuke Harada, Koichiro Okamoto
  • Patent number: 8507091
    Abstract: A method of reducing an odor of composite resin particles comprising the step of: fluidizing the composite resin particles, which contain a polyolefin-based resin and a polystyrene-based resin and which are used for producing an expanded molded article, in a container with a gas that is blown thereinto from its bottom and that has a temperature of (T?40)° C. to (T?10)° C. (T is a softening temperature of the composite resin particles), to reduce the odor generated from a raw material of the composite resin particles and generated according to a method of the composite resin particles, wherein the composite resin particles whose odor is reduced are impregnated with a blowing agent; and the resultant is pre-expanded and then subject to an in-mold forming to make the expanded molded article have an odor strength of 3 or less in average value in odor test in which odor of an isovaleric acid diluted 100000 times is defined as 3, which means a reference odor, within 0 to 5 levels of the odor strength.
    Type: Grant
    Filed: March 24, 2010
    Date of Patent: August 13, 2013
    Assignee: Sekisui Plastics Co., Ltd.
    Inventors: Shinji Ishida, Hideyasu Matsumura
  • Publication number: 20130184363
    Abstract: Modified polystyrene-based resin particles comprising polyacrylic acid ester-based resin microparticles having an average particle diameter in the range of from 30 to 1,000 nm being dispersed in polystyrene-based resin particles, such that the polyacrylic acid ester-based resin microparticles are present (1) in the area ratio of from 0.1 to 15% in a surface area, which includes areas up to 20 ?m from the surface of each resin particle, and (2) present in the area ratio of from 11 to 50% in the inner area, which includes the area between the center of each resin particle and an point 30% of the radius from the center of each particle.
    Type: Application
    Filed: September 30, 2011
    Publication date: July 18, 2013
    Applicant: SEKISUI PLASTICS CO., LTD.
    Inventors: Yasutaka Tsutsui, Shingo Terasaki
  • Patent number: 8486530
    Abstract: A method of reducing a volatile organic compound of composite resin particles comprising the step of: blowing a gas from a bottom part of a container in order to fluidize composite resin particles containing a polyolefin-based resin and a polystyrene-based resin in the container until an amount of volatile organic compounds contained in the whole composite resin particles becomes 50 ppm or less, wherein the gas has a temperature of (T?40) to (T?10)° C. when a softening temperature of the composite resin particles is defined as T° C.
    Type: Grant
    Filed: March 24, 2010
    Date of Patent: July 16, 2013
    Assignee: Sekisui Plastics Co., Ltd.
    Inventors: Hideyasu Matsumura, Shinji Ishida
  • Patent number: 8476325
    Abstract: A method for producing styrene-modified polyethylene-based resin beads, including the steps of: dispersing 100 parts by weight of polyethylene-based resin beads which contain an inorganic nucleating agent and have a melting point of 95° C. to 115° C., 20 parts by weight or more and less than 300 parts by weight of a styrene-based monomer and a polymerization initiator into an aqueous suspension containing a dispersant; impregnating the polyethylene-based resin beads with the styrene-based monomer under heating the resulting dispersion at such a temperature that the styrene-based monomer does not substantially polymerize; and performing polymerization of the styrene-based monomer at a temperature of (T)° C. to (T+25)° C. (where T° C. is a melting point of the polyethylene-based resin beads.
    Type: Grant
    Filed: August 19, 2005
    Date of Patent: July 2, 2013
    Assignee: Sekisui Plastics Co., Ltd.
    Inventors: Hideyasu Matsumura, Tatsuya Matsugashita
  • Publication number: 20130157014
    Abstract: A molded foam is provided in which even when a force in a sliding direction is applied to another member in contact with its surface, the occurrence of a shift in position relative to the other member can effectively be prevented and the occurrence of unusual noise due to rubbing between its surface and the other member can effectively be prevented. The molded foam is formed by heating expandable resin particles filled into a foaming mold. The molded foam has a plurality of first ridges arranged in one direction and a plurality of second ridges arranged in another direction and disposed so as to intersect the first ridges, the first and second ridges being provided on the surface of the molded foam.
    Type: Application
    Filed: August 31, 2011
    Publication date: June 20, 2013
    Applicant: SEKISUI PLASTICS CO., LTD.
    Inventors: Koji Mori, Yushi Sakakibara, Masamitsu Kondo, Motokazu Yoshii
  • Publication number: 20130065977
    Abstract: Expandable composite resin particles for frozen storage comprising: composite resin particles of a polyolefin-based resin and a polystyrene-based resin; 7.5 to 11% by weight of volatile blowing agent contained in the composite resin particles and containing pentane; and 0.5 to 1.5% by weight of moisture attached to surfaces of the composite resin particles.
    Type: Application
    Filed: January 24, 2011
    Publication date: March 14, 2013
    Applicant: SEKISUI PLASTICS CO., LTD.
    Inventors: Yasutaka Tsutsui, Masahiko Ozawa
  • Patent number: 8372512
    Abstract: The present invention provides a method for producing polylactic acid-based resin foamed particles for in-mold foam-molding from which a polylactic acid-based resin foam-molded article excellent in heat resistance and mechanical strength can be obtained by in-mold foam-molding. In the method of the present invention for producing polylactic acid-based resin foamed particles for in-mold foam-molding, a rotary blade is rotated at a given rotation speed while being always in contact with the front end surface of a nozzle and a polylactic acid-based resin extrudate extrusion-foamed through a nozzle is cut with the rotary blade, so that it is possible to cut the polylactic acid-based resin extrudate surely to obtain substantially spherical polylactic acid-based resin foamed particles.
    Type: Grant
    Filed: March 27, 2008
    Date of Patent: February 12, 2013
    Assignee: Sekisui Plastics Co., Ltd.
    Inventors: Takaaki Hirai, Katsunori Nishijima, Tetsuya Ochiai
  • Publication number: 20130018116
    Abstract: An object is to provide a resin foam sheet having good reformability, and a method for easily producing such a resin foam sheet. Provided are a resin foam sheet formed by extrusion foaming with an extruder a polypropylene-based resin composition mainly composed of a polypropylene-based resin component containing a polypropylene-based resin and a high melt tension polypropylene resin having a higher melt tension than that of the polypropylene-based resin, wherein the high melt tension polypropylene resin has a melt tension after being passed through the extruder of 4 cN or more and 10 cN or less, and a rate at breakage after being passed through the extruder of 12 m/min or higher and 26 m/min or lower, and the like.
    Type: Application
    Filed: February 25, 2011
    Publication date: January 17, 2013
    Applicant: SEKISUI PLASTICS CO., LTD.
    Inventors: Tadakazu Anan, Toshiyuki Oonishi
  • Patent number: 8329294
    Abstract: A styrene-modified polypropylene type resin particle of the present invention includes: a polypropylene type resin and a polystyrene type resin, wherein the polystyrene type resin is included at 30 parts by weight or more but less than 600 parts by weight per 100 parts by weight of the polypropylene type resin, and polystyrene type resin particles having a longitudinal diameter of 5 ?m or less are dispersed in the polypropylene type resin.
    Type: Grant
    Filed: February 21, 2007
    Date of Patent: December 11, 2012
    Assignee: Sekisui Plastics Co., Ltd.
    Inventors: Shinji Ishida, Masahiko Ozawa
  • Patent number: 8251232
    Abstract: An article advancing device and an article arrangement shelf with simple structures can be securely operated without electric power. The article advancing device includes elongated drawer members with flexible band-shaped sheets and stopper structures disposed at distal ends of the flexible band-shaped sheets to allow articles to be arranged on the elongated drawer members when pulled-out, rollers for fixing proximal ends of the band-shaped sheets in position and winding up the band-shaped sheets by predetermined driving force while allowing the band-shaped sheets to be freely pulled out, and a main body for housing the rollers and the wound up band-shaped sheets. The rollers are disposed in parallel to each other within the main body, and the elongated drawer members are disposed on the rollers respectively so as not to overlap each other in a width direction.
    Type: Grant
    Filed: November 29, 2010
    Date of Patent: August 28, 2012
    Assignees: Sekisui Plastics Co., Ltd., Arakawa Kinzoku Co. Ltd.
    Inventors: Kazunori Nakaya, Koichi Yamazaki, Hiroyuki Ono, Tatsuo Arakawa
  • Publication number: 20120126606
    Abstract: An object is to provide a coupling device protection member that can prevent contact between a cushion material and a coupling device to protect the coupling device. A coupling device protection member is used in a vehicle seat that includes a cushion material that is elastically deformed by loads, a frame member that is stacked to the cushion material to reinforce the cushion material, and a surface cover that covers at least the cushion material, the surface cover being coupled to the frame member via a coupling device, in which the coupling device protection member is attached to the frame material so as to protect the coupling device coupled to the frame member.
    Type: Application
    Filed: August 5, 2010
    Publication date: May 24, 2012
    Applicant: SEKISUI PLASTICS CO., LTD.
    Inventors: Shinji Takakura, Takeharu Nakano, Takehiro Togami
  • Publication number: 20120041085
    Abstract: Expandable composite resin particles for long-term storage, comprising 500 to 5000 ppm of water and 7.5 to 11.0% by weight of pentane in composite resin of polyolefin-based resin and polystyrene-based resin.
    Type: Application
    Filed: March 2, 2010
    Publication date: February 16, 2012
    Applicant: SEKISUI PLASTICS CO., LTD.
    Inventors: Yasutaka Tsutsui, Masahiko Ozawa
  • Publication number: 20120021220
    Abstract: A method of reducing an odor of composite resin particles comprising the step of: fluidizing the composite resin particles, which contain a polyolefin-based resin and a polystyrene-based resin and which are used for producing an expanded molded article, in a container with a gas that is blown thereinto from its bottom and that has a temperature of (T?40)° C. to (T?10)° C. (T is a softening temperature of the composite resin particles), to reduce the odor generated from a raw material of the composite resin particles and generated according to a method of the composite resin particles, wherein the composite resin particles whose odor is reduced are impregnated with a blowing agent; and the resultant is pre-expanded and then subject to an in-mold forming to make the expanded molded article have an odor strength of 3 or less in average value in odor test in which odor of an isovaleric acid diluted 100000 times is defined as 3, which means a reference odor, within 0 to 5 levels of the odor strength.
    Type: Application
    Filed: March 24, 2010
    Publication date: January 26, 2012
    Applicant: SEKISUI PLASTICS CO., LTD.
    Inventors: Shinji Ishida, Hideyasu Matsumura
  • Publication number: 20120003478
    Abstract: A method of reducing a volatile organic compound of composite resin particles comprising the step of: blowing a gas from a bottom part of a container in order to fluidize composite resin particles containing a polyolefin-based resin and a polystyrene-based resin in the container until an amount of volatile organic compounds contained in the whole composite resin particles becomes 50 ppm or less, wherein the gas has a temperature of (T?40) to (T?10)° C. when a softening temperature of the composite resin particles is defined as T° C.
    Type: Application
    Filed: March 24, 2010
    Publication date: January 5, 2012
    Applicant: SEKISUI PLASTICS CO., LTD.
    Inventors: Hideyasu Matsumura, Shinji Ishida