Patents Assigned to Sekisui Kagaku Kogyo Kabushiki Kaisha
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Patent number: 4169819Abstract: A stabilized chlorine-containing resin composition having improved thermal stability comprising a chlorine-containing resin and, as a stabilizer, a melted then solidified mixture having a melting temperature of about 50.degree. to about 180.degree. C. of at least one polyhydric alcohol and at least one ester derivative of a polyhydric alcohol.Type: GrantFiled: April 18, 1978Date of Patent: October 2, 1979Assignee: Sekisui Kagaku Kogyo Kabushiki KaishaInventors: Tomoo Shiohara, Mikihiko Horioka
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Patent number: 4165354Abstract: A process for producing a plastic pipe having an oval cross-sectional shape with a high dimensional precision, which comprises conducting a roughly shaped plastic pipe having an oval cross-sectional shape, which is in the softened state and composed of a large-diameter portion, a small-diameter portion and transitional portions connecting them to each other, to a cooling tank while its shape is adjusted by being passed through a forming tube with its large-diameter portion down; cooling the form-adjusted plastic pipe in the cooling tank by dipping the large-diameter portion or both the large diameter portion and a part of the transitional portions contiguous thereto in a cooling bath; and subjecting that portion of the form-adjusted plastic pipe which is out of the cooling bath to a shower of a cooling liquid. This plastic pipe is useful for a drainage or sewage system.Type: GrantFiled: August 15, 1977Date of Patent: August 21, 1979Assignee: Sekisui Kagaku Kogyo Kabushiki KaishaInventor: Noboru Iida
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Patent number: 4163075Abstract: A method for performing electric discharge recording on the recording surface of an electric discharge recording material using a discharge recording stylus, which comprises interposing an electrically anisotropic non-recording layer between the recording surface and the discharge recording stylus, said non-recording layer being prepared by dispersing a metal powder in a resin matrix and having a surface resistance of at least 10.sup.8 ohms and a volume resistance of not more than 10.sup.4 ohms-cm, and performing electric discharge recording through the non-recording layer; and a composite discharge recording material which comprises (a) an electric discharge-breakable semiconductive resin layer having a surface resistance of 10.sup.5 to 10.sup.16 ohms and a volume resistance of 10.sup.3 to 10.sup.14 ohms-cm, (b) a metal-containing resin layer having a surface resistance of at least 10.sup.8 ohms and a volume resistance of not more than 10.sup.Type: GrantFiled: July 7, 1977Date of Patent: July 31, 1979Assignee: Sekisui Kagaku Kogyo Kabushiki KaishaInventors: Shiro Nakano, Masaru Koike
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Patent number: 4163000Abstract: A foundry mold composition comprising a foundry mold sand, a binder in an amount sufficient to bind the sand and less than 1 part by weight, per 100 parts by weight of the sand, of clay, said binder being an aqueous solution of a water-soluble maleic acid-type copolymer in an amount of at least 1 part by weight per 100 parts by weight of the sand, and a process for producing a foundry mold, using aforesaid composition.Type: GrantFiled: December 1, 1977Date of Patent: July 31, 1979Assignee: Sekisui Kagaku Kogyo Kabushiki KaishaInventors: Jiro Kashima, Synji Sato
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Patent number: 4160072Abstract: A foamable and crosslinkable polyethylene composition comprising(a) modified polyethylene obtained by chemically bonding a silane compound containing at least one unsaturated group to polyethylene in the presence of a radical generator,(b) a zinc salt of a higher carboxylic acid, and(c) a heat-decomposable blowing agent, and ingredients (a), (b) and (c) having been melt-kneaded with one another at a temperature lower than the decomposition temperature of the heat-decomposable blowing agent.Type: GrantFiled: October 31, 1977Date of Patent: July 3, 1979Assignee: Sekisui Kagaku Kogyo Kabushiki KaishaInventors: Ken Shinkai, Norio Chiba, Yutaka Ozaki
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Patent number: 4158075Abstract: A stabilizer for chlorine-containing resins, comprising calcium hydroxide coated with a calcium salt of an organic acid, and a process for producing the same wherein calcium hydroxide and an organic acid are reacted at a molar ratio of 1 mole of calcium hydroxide: not more than 2 moles of organic acid in the presence of a medium and a surface active agent, while heating and stirring, to convert the outer surface of the calcium hydroxide to a calcium salt of the organic acid.Type: GrantFiled: February 17, 1978Date of Patent: June 12, 1979Assignees: Sekisui Kagaku Kogyo Kabushiki Kaisha, Shinagawa Chemical Industry Co., Ltd.Inventors: Katsuhiko Tanioka, Toshihiko Matsuzawa, Noboru Iida, Naoji Makino, Itirow Hayasaka
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Patent number: 4149972Abstract: A waste water treating apparatus comprising thin fan-shaped sheets made of an unfoamed synthetic resin and assembled via spacers. A tubular member made of a synthetic resin is inserted through holes in the fan-shaped sheets and holes in the spacers to form an assembly of the sheets. The assembly is radially disposed around a rotating shaft and forms a generally circular rotary body, the tubular member having a metallic core shaft inserted therein, and the core shaft being secured to a frame for holding the rotary body.Type: GrantFiled: February 14, 1978Date of Patent: April 17, 1979Assignee: Sekisui Kagaku Kogyo Kabushiki KaishaInventors: Noboru Iwai, Takashi Okumura
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Patent number: 4147819Abstract: An improved method for forming a coating of a polyphenylene sulfide on the surface of a metal substrate which comprises fusing a powder of polyphenylene sulfide to the surface of substrate metal and then curing the resin under heat; wherein the fused polyphenylene sulfide resin is solidified by quenching, and then heat-cured. This method permits increased operational efficiency and productivity over the prior technique.Type: GrantFiled: March 16, 1977Date of Patent: April 3, 1979Assignee: Sekisui Kagaku Kogyo Kabushiki KaishaInventors: Yorio Hukumoto, Hiroshi Kashiwadani, Shuji Hiramatsu
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Patent number: 4141888Abstract: A process for producing a reduced keratinous substance having a high adsorptive power for cationic substances, which comprises reducing a substance containing keratin as a main ingredient under alkaline conditions to cleave the disulfide linkages of the keratin, dissolving the reduced keratin in an aqueous medium containing urea or thiourea in a concentration of less than 5 moles/liter, and then acidifying the resulting solution to precipitate the dissolved reduced keratin under such conditions that the thiol side-chains present in the reduced keratin do not substantially undergo oxidation. The reduced keratinous substance is especially useful as a heavy metal ion capturing agent.Type: GrantFiled: March 6, 1978Date of Patent: February 27, 1979Assignee: Sekisui Kagaku Kogyo Kabushiki KaishaInventors: Hisayuki Matsuda, Minoru Takahashi, Katsuro Shinoda, Sho Kikyotani, Hiroshi Inagaki
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Patent number: 4137383Abstract: A process for stabilizing a chlorine-containing resin which comprises contacting a chlorine-containing resin with one or more gaseous hydrides.BACKGROUND OF THE INVENTION1. Field of the InventionThis invention relates to a process for stabilizing a chlorine-containing resin (hereafter often merely a "resin" or "resins").2. Description of the Prior ArtExamples of chlorine-containing resins include, for example, polyvinyl chloride; polyvinylidene chloride; a vinyl chloride-vinylidene chloride copolymer having a vinyl chloride content of about 5 to 95% by weight; a vinyl chloride-vinyl acetate copolymer, most generally commercially available with a vinyl-acetate content of 0.4 to 40 wt%, more often 0.Type: GrantFiled: December 29, 1975Date of Patent: January 30, 1979Assignee: Sekisui Kagaku Kogyo Kabushiki KaishaInventors: Norio Sagane, Minoru Kohara, Tomoo Shiohara, Yasuhiko Araki
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Patent number: 4135871Abstract: Resin tubes having thick walled portions and thin walled portions are formed by providing a specially configured orifice on an extruder and varying the rate at which the extruded resin tube is pulled from the extruder. The orifice is shaped to form a thin tubular opening and a thick tubular opening communicating with one another, the thick tubular opening being adjacent and down-stream of the thin opening. When the extruded resin tube is pulled at a high speed the thin tubular opening is filled with resin that passes through but does not fill the thick tubular opening. At the slow pulling speed the resin fills at least the open-end portion of the thick tubular opening thereby forming a thick walled portion of the resin tube.Type: GrantFiled: February 24, 1977Date of Patent: January 23, 1979Assignee: Sekisui Kagaku Kogyo Kabushiki KaishaInventors: Sadao Murai, Takeshi Kita, Kiyoshi Mochizuki
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Patent number: 4124344Abstract: A plastic foamed sheet of excellent quality is produced by using an apparatus comprising a preheating chamber including a conveyor means for continuously conveying a thermoplastic resin sheet containing a heat-decomposable blowing agent in the horizontally supported state and a heating means for heating the sheet to a temperature lower than the decomposition temperature of the blowing agent, and a foaming chamber connected to the preheating chamber and including a heating means for heat-foaming the sheet as it is continuously conveyed while being perpendicularly suspended from the terminal end portion of the conveyor means.Type: GrantFiled: April 6, 1977Date of Patent: November 7, 1978Assignee: Sekisui Kagaku Kogyo Kabushiki KaishaInventors: Hiroshi Kiyono, Akio Ishimoto, Yoichiro Noda, Kozo Yada
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Patent number: 4118892Abstract: A molded synthetic resin nursery box B comprises a grid member 2 dividing the box into individual compartments 3 communicating with each other through side wall apertures 23. A wavy bottom plate 12 of the box has drainage holes 13 therein, and the grid member side walls are notched at their top edges. Adjacent boxes are connected by engaging projections 4 on one box with mating slots 5 on another box. The planted boxes may be installed on a horizontal surface whereby the grid members bear the weight of a person walking thereon to prevent trampling and plant damage, or vertically by mounting the boxes in assembled, stacked frames 100 filled with soil. Alternatively, the grid members may be made separate from the bottom plate and side wall 11 bases, and snap-connected to pedestals 14 upstanding from the bottom plates after planting.Type: GrantFiled: February 4, 1977Date of Patent: October 10, 1978Assignees: Sekisui Kagaku Kogyo Kabushiki Kaisha, Kabushiki Kaisha Hayashi ZoenInventors: Tsugio Nakamura, Seigo Aizaki, Kosei Hayashi
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Patent number: 4118227Abstract: An improved process for producing .gamma.-dicalcium silicate powder which is fine and has a uniform particle size. The .gamma.-dicalcium silicate power has a great ability to capture hydrogen halides and low hygroscopcity, and is useful as a stabilizer for halogen-containing synthetic resins and a filler for synthetic resins.Type: GrantFiled: May 20, 1977Date of Patent: October 3, 1978Assignee: Sekisui Kagaku Kogyo Kabushiki KaishaInventors: Tomoo Shiohara, Minoru Miyamoto, Nobuo Tamaki
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Patent number: 4116907Abstract: A chlorine-containing resin composition comprising a chlorine-containing resin and, as thermal stabilizers for the chlorine-containing resin, the combination of (1) at least one magnesium diketone complex which is represented by the formula ##STR1## WHEREIN R.sub.1 represents a p-chlorophenyl group, a phenyl group, or a methyl group, and R.sub.2 represents a p-chlorophenyl group, a phenyl group, a methyl group or an ethoxy group, (2) at least one of (a) a monohydric acyclic or cyclic alcohol having 8 to 18 carbon atoms, a dihydric alcohol represented by the formula OH--(CH.sub.2).sub.Type: GrantFiled: April 13, 1977Date of Patent: September 26, 1978Assignee: Sekisui Kagaku Kogyo Kabushiki KaishaInventors: Tomoo Shiohara, Takayoshi Matsunaga, Mikihiko Horioka
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Patent number: 4111464Abstract: A female pipe joint end 3 has a circular groove 11 and a rectangular circular groove 9 in its expanded inner periphery, and a mating male pipe joint end 6 has a tapered insertion edge 5 and a circular groove 7 in its outer periphery. The side wall of the groove 7 nearest the pipe end is perpendicular to the pipe axis; the opposite side wall is tapered. A packing seal 10 is disposed in the groove 11, and a continuous, relatively rigid locking ring 4 of synthetic resin is disposed in the groove 9 and snap fitted into the groove 7 during assembly. The ring 4 may have a bevelled lip 13, stepped inner and outer peripheries 15, 16, 17, or axial grooves 14 or holes 14' therethrough.Type: GrantFiled: January 17, 1977Date of Patent: September 5, 1978Assignee: Sekisui Kagaku Kogyo Kabushiki KaishaInventors: Teryoshi Asano, Sadao Fukuoka, Takashi Sawada
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Patent number: 4110394Abstract: In a process for forming a resin body, the thickness of the body is altered by altering the feed rate of raw material to an extruder and the screw rate of the extruder screw in such a relationship to alter the quantity extrusion rate without altering the amount of resin within the extruder.Type: GrantFiled: May 12, 1976Date of Patent: August 29, 1978Assignee: Sekisui Kagaku Kogyo Kabushiki KaishaInventors: Teizo Shimada, Takeshi Kita, Kiyoshi Mochizuki, Takahiro Komiya
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Patent number: 4107249Abstract: An annular groove is formed in the periphery of thermoplastic pipe near an end thereof by combining the forces of a fluid under pressure and a rigid expandable core mold. A pipe is heated, softened and placed over a core mold having an extensible portion. The extensible portion is in the retracted state initially and presents no obstacle to the placement of the pipe on the core mold. A space is provided internally of the pipe and is sealed by parts of the core mold whereby the application of a fluid pressure pushes outwardly on the inner periphery of the pipe. At the same time or subsequently the extensible portion of the core mold is extended to provide additional pressure to and to shape the latter internal periphery of the pipe.Type: GrantFiled: March 12, 1976Date of Patent: August 15, 1978Assignee: Sekisui Kagaku Kogyo Kabushiki KaishaInventors: Sadao Murai, Nobuo Goto, Katsuhiko Tanioka, Masaaki Matsunaga, Riyoiti Isayama
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Patent number: 4105449Abstract: An electrophotographic recording material formed by extrusion, which comprises (A) 100 parts by weight of a blended composition of olefins having high and low melt indices in a specified weight ratio, (B) 0.025 to 40 parts by weight of a specified light-sensitizing organic compound, (C) 200 to 600 parts by weight of particulate photoconductive zinc oxide, (D) 0.06 to 0.4 part by weight, per 100 parts by weight of the total of components (A), (B) and (C), of a specified metal (e.g., Mg, Ca, Zn, Sn) salt of a C.sub.12-20 saturated or unsaturated fatty acid, and (E) 1 to 20 parts by weight of a silicone polymer; the components (B), (C), (D) and (E) being uniformly dispersed in component (A), and the light-sensitizing organic compound (B) being adsorbed to the surface of the zinc oxide (C).Type: GrantFiled: June 21, 1977Date of Patent: August 8, 1978Assignee: Sekisui Kagaku Kogyo Kabushiki KaishaInventors: Tadayoshi Tanei, Shigeki Nakamura, Masahiro Hotta
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Patent number: 4100307Abstract: A resin pipe joint is formed having a groove on the internal surface thereof adapted for receiving a seal. The mold for forming the pipe joint includes an external split mold and an internal mold core and sleeve with parts slidable relative to one another so that the elements form a space therebetween for injecting resin therein. Subsequently, while the injected resin is still in an unhardened state, the movable parts are moved to a second position relative to one another thereby providing an annular opening surrounding the resin body formed during the resin injecting step. A pressurized fluid is jetted through a passageway towards the internal periphery of the resin body to cause said resin body to bulge into the annular space thereby creating the internal groove or exteranl bulge in the resin body.Type: GrantFiled: December 6, 1977Date of Patent: July 11, 1978Assignee: Sekisui Kagaku Kogyo Kabushiki KaishaInventor: Teryoshi Asano