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Japan Styrene Paper Corporation Patents
Assignee:
Japan Styrene Paper Corporation
Address:
Tokyo, JP
No. of patents:
43
Patents:












Patent Number Title Of Patent Date Issued
RE32780 Core material for an automobile bumper November 8, 1988
For use in an automobile bumper, a core material composed of a molded article of prefoamed polyolefin resin particles. The core material has a density of 0.05 to 0.15 g/cm.sup.3 and the relation represented by the following expressionwherein E.sub.20 is the amount of energy absorption (k
5281377 Process for the production of foamed polyolefin sheets January 25, 1994
A foamed polyolefin sheet is formed by extruding a molten polyolefin resin, which contains a blowing agent, into a low-pressure zone through an annular die provided at an end of the extruder to form a foamed tubular body, bringing the foamed tubular body into contact with a peripheral
5281119 Apparatus for the production of foamed polyolefin sheets January 25, 1994
An apparatus for the formation of a foamed polyolefin sheet provided with a cylindrical cooling device for cooling a foamed extruded tubular body at one end of an extruder, air outlets for increasing the internal pressure of the cooled foamed tubular body at a region between the extruder
5015667 Pre-foamed beads of polyethylene base resin May 14, 1991
A method of forming pre-foamed beads of a polyethylene-base resin are disclosed. The polyethylene-base resin has been obtained by crosslinking a starting polyethylene-base resin having a density greater than 0.940 g/cm.sup.3 and the pre-foamed beads have a crosslinking degree of 10-45%
4948817 Pre-foamed particles of uncrosslinked, linear low-density polyethylene and production method the August 14, 1990
Pre-formed particles of an uncrosslinked, linear low-density polyethylene have a crystalline structure characterized in that two endothermic peaks appear on a DSC curve obtained by differential scanning calorimetry of the pre-foamed particles (said DSC curve having been obtained by heati
4889671 Production method of prefoamed particles of polyolefin resin December 26, 1989
Prefoamed particles of a polyolefin resin are produced by dispersing starting particles of the polyolefin resin, which contains a volatile foaming agent, in a dispersant in a pressure vessel, heating the resultant dispersion to a temperature of at least the softening point of the sta
4840973 Polypropylene resin prefoamed particles June 20, 1989
Prefoamed particles consisting essentially of an ethylene/propylene random copolymer, wherein said prefoamed particles are obtained by foaming particles of an ethylene/propylene random copolymer containing 1 to 4% by weight of random-copolymerized ethylene at a temperature in the range o
4822542 Method of production of expansion-molded article, from foamable thermoplastic resin particles an April 18, 1989
This invention relates to a method and apparatus for improving not only the quality of the production of molded foamable thermoplastic resin particles converted into fusion-bonded materials but also the output by protecting the resin from atmospheric pressure by pressurizing the particle
4806293 Method of producing a foamed, molded article February 21, 1989
Method of producing a molded article of a foamed thermoplastic resin. A molten mass of an expandable thermoplastic resin is accumulated in an accumulator while it is prevented from foaming. A predetermined quantity of the accumulated thermoplastic resin is ejected rapidly from the ac
4777000 Production method of expansion-molded article of polypropylene resin October 11, 1988
An expansion-molded article of a polypropylene resin is produced by filling pre-foamed particles of the polypropylene resin, which have a crystalline structure featuring an inherent peak inherent to the polypropylene resin and a high-temperature peak on the temperature side higher than t
4756948 Core material for automobile bumpers July 12, 1988
A core material for an automobile bumper is disclosed, which includes an elongated body of a foamed polyolefin resin provided with a plurality of depressed portions in front and/or rear surfaces thereof, and structural members disposed within at least part of said depressed portions. The
4711287 Casting method December 8, 1987
A consumable pattern of an expanded polyolefin resin and a bulk density of 0.025-0.012 g/cm.sup.3 is embedded in a mold body, a gating system leading to the pattern is formed in the mold body, and molten metal is poured into the gating system to volatilize and replace the pattern. The po
4707569 Multi-conductor cable November 17, 1987
A multi-conductor cable such as an electrical power cable, a signal-transmission cable or optical fiber cable, including a core made of a plurality of insulated conductors, a sheath surrounding the core, and a plurality of foamed plastic string fillers which fill the void space betwe
4692507 Propylene-base random copolymer particles and production process thereof September 8, 1987
Propylene-base random copolymer particles suitable for use in the production of pre-foamed particles are obtained by heating starting copolymer particles of ethylene-propylene random copolymer to the crystallization temperature thereof and then quenching them in a medium at a tempera
4676939 Process for the production of expanded particles of a polypropylene resin June 30, 1987
A process for the production of expanded particles, which comprises providing an aqueous dispersion containing expandable particles which are formed of a polypropylene resin and which contain a blowing agent and an expansion aid and maintained at a temperature higher than the softening
4674976 Method for the preparation of a foamed article of a polyolefin resin June 23, 1987
A sheet of a cross-linkable and foamable polyolefin resin is thermally treated on an endless conveyor belt formed of a plain weave wire net. A plurality of parallel, spaced apart rolls are disposed in a direction perpendicular to the direction in which the conveyor belt runs for supp
4657937 Energy absorber April 14, 1987
An energy absorber suitable for use as a bumper core or the like is formed of an expansion-molded article of prefoamed particles. The prefoamed particles use, as the base resin thereof, a resin obtained by impregnating high-density polyethylene with an aromatic vinyl monomer and polymeri
4656197 Pre-foamed particles of polyethylene resin April 7, 1987
Pre-foamed particles are formed of a polyethylene resin obtained by crosslinking a linear super-low density polyethylene having a density of 0.880-0.914 g/cm.sup.3 and a melt flow rate of 0.01-10 g/10 minutes. The gel content of the pre-foamed particles is 0.06-45%.
4649001 Process for producing polyethylene extruded foams March 10, 1987
In a process for producing a polyethylene extruded foam, which comprises melting and kneading a composition of a polyethylene-based resin containing a foaming agent and extrusion-foaming it, a linear low-density polyethylene having a broadness of molecular weight distribution is used
4617323 Prefoamed particles of crosslinked propylene-type resin and molded article prepared therefrom October 14, 1986
Prefoamed crosslinked propylene-type resin particles prepared by using as a base resin a propylene random copolymer whose amount of heat of crystallization determined by a DSC method is 19 to 10 cal/g. The prefoamed particles have a gel fraction of 1 to 65%. Also provided is a molded
4602082 Propylene-base random copolymer particles and production process thereof July 22, 1986
Disclosed herein are propylene-base random copolymer particles suitable for use in the production of pre-foamed particles. The copolymer particles are obtained by heating starting copolymer particles to the crystallization temperature thereof and then quenching them in a medium of (the
4600636 Core material for an automobile bumper July 15, 1986
For use in an automobile bumper, a core material composed of a molded article of prefoamed polyolefin resin particles. The core material has a density of 0.05 to 0.15 g/cm.sup.3 and the relation represented by the following expressionwherein E.sub.20 is the amount of energy absorption (k
4598001 Bumper core and process producing same July 1, 1986
A bumper core suitable for use in the fabrication of an energy-absorbing automobile bumper is formed by molding core-constituting members in accordance with the expansion molding process and then bonding them together at their confronting lengthwise end portions into a unitary body.
4587270 Preliminarily foamed particles of non-crosslinked polypropylene-type resin May 6, 1986
Preliminarily foamed particles of a non-crosslinked polypropylene resin based on an alpha-olefin/propylene random copolymer having an amount of the heat of crystallization in the range of 5 to 15 cal/g, said preliminarily foamed particles having such a crystal structure that when a D
4568608 Pre-foamed particles of polypropylene-base resin February 4, 1986
In pre-foamed particles of a propylene-base resin obtained by foaming raw particles of the propylene-base resin, the relation, G.sub.1 -G.sub.2 .gtoreq.10%, exists between the content G.sub.1 (%) of matter, which is contained in the pre-foamed particles and is insoluble in boiling n-
4567208 Preliminarily foamed particles of non-crosslinked polypropylene-type resin January 28, 1986
Preliminarily foamed particles of a non-crosslinked polypropylene-type resin based on a mixture of 10 to 95% by weight of an alpha-olefin/propylene random copolymer having an amount of the heat of crystallization of not more than 10 cal/g in differential scanning calorimetry and 90 t
4504653 Process for producing polyolefin resin particles March 12, 1985
A process for producing particles having an increased particle diameter from a powder of a polyolefin resin, which comprises heating the polyolefin resin powder at a temperature higher than the melting point of the resin in a dispersion medium in the presence of a dispersing agent and
4504601 Process for producing pre-foamed particles of polypropylene resin March 12, 1985
A process for producing pre-foamed particles of a polypropylene resin which comprises expanding original pre-foamed particles of a polypropylene resin, said original pre-foamed particles having the following relationwherein E is the expansion ratio of the original pre-foamed particles, and
4504534 Core material for automobile bumpers March 12, 1985
A core material for automobile bumpers which is composed of a molded article of foamed particles of a polypropylene-type resin. The molded article has a density of 0.015 to 0.045 g/cm.sup.3 and a compression stress at 50% compression of at least 1 kg/cm.sup.2. The core material simul
4496627 Electrical conductive foam beads and molded electrical conductive foamed articles obtained there January 29, 1985
This invention provides an electrical conductive foam bead comprising a foamed bead core of a thermoplastic synthetic resin at least partially covered on the surface thereof with an electrical conductive layer, and a molded electrical conductive foamed article comprising a plurality of
4464484 Process for producing prefoamed polymer particles August 7, 1984
Prefoamed polymer particles having excellent moldability are produced by a process comprising a step (impregnating step) of impregnating carbon dioxide or carbon dioxide and a volatile blowing agent in polymer particles, a step (dispersing step) of dispersing the polymer particles in
4451417 Method of producing extruded plate-like polystyrene foam May 29, 1984
In a method of producing a plate-like polystyrene resin foam which comprises extruding a molten mixture of a polystyrene resin and a volatile blowing agent from an extruder into a zone kept at a lower pressure than the inside of the extruder, the improvement wherein the volatile blowing
4443393 Method of pressurizing treatment of pre-foamed particles of polyolefin resin April 17, 1984
A method for pressurizing pre-foamed particles of a polyolefin resin by maintaining the pre-foamed particles in an atmosphere of a pressurized gas to impart a predetermined internal pressure thereto, which comprises first maintaining the particles under a pressure which does not cause sh
4440703 Process for producing foamed and molded article of polypropylene resin April 3, 1984
A process for producing a foamed and molded article of a polypropylene resin, which comprises pressurizing preliminarily-foamed particles of an ethylene/propylene copolymer having a melt index value of from 0.1 to 25, a latent heat of crystallization of not more than 28 cal/g and an ethy
4436840 Process for producing pre-foamed particles of polyolefin resin March 13, 1984
In a process for producing pre-foamed particles of a polyolefin resin which comprises impregnating a volatile blowing agent into particles of a polyolefin resin while dispersing the resin particles and the blowing agent in a dispersing medium under heat in a closed vessel, opening one
4415392 Method for producing foamed plastic sheet November 15, 1983
A method for producing a foamed plastic sheet which comprises heating and kneading a thermoplastic synthetic resin composition containing a blowing agent in an extruder, extruding the resulting gel through a circular die provided at the end of the extruder, and pinching the tubular foame
4399087 Process for producing foamed polyolefin articles from aged pre-foamed particles of polyolefin re August 16, 1983
In a process for producing a foamed article of a polyolefin resin which comprises filling in a mold pre-foamed particles of a polyolefin resin containing a gaseous mixture consisting of an inorganic gas and a volatile organic blowing agent in their cells and heating them to mold a foamed
4393016 Process for producing plate-like polystyrene resin foam July 12, 1983
In a process for producing a plate-like polystyrene resin foam which comprises extruding a molten mixture consisting of a polystyrene resin and a volatile blowing agent by an extruder into a zone having a lower pressure than the inside of the extruder; the improvement wherein said vo
4379859 Pre-foamed particles of polypropylene resin and process for production thereof April 12, 1983
Substantially non-crosslinked pre-foamed particles of a polypropylene resin, characterized by the fact that they are composed of an ethylene/propylene random copolymer or a mixture of an ethylene/propylene random copolymer with low density polyethylene and/or an ethylene/vinyl acetat
4324748 Process and apparatus for extruding plastic foams through a fluorocarbon lined die shaping means April 13, 1982
In a method for producing a plastic foam of a desired expanded dimension which is constituted by extruding a melt of a thermoplastic synthetic resin containing a blowing agent through a die of an extruder and passing the extrudate through a shaping device located outwardly of the extrude
4260572 Process for producing foamed polystyrene boards April 7, 1981
A foamed polystyrene board useful as a thermal insulating material is produced by melting a polystyrene having a melt index of from 0.5 to 5 under heat in an extruder, mixing the molten mass with a blowing agent composed of methyl chloride and dichlorodifluoromethane, and extruding the
4255371 Process for producing olefinic resin foams March 10, 1981
In a process for producing an olefinic resin foam which comprises the steps of forming a composition comprising an olefinic resin, a chemical blowing agent and a crosslinking agent into an unfoamed sheet-like or rod-like shaped article and foaming it by heating, the improvement wherein t
4255110 Apparatus for producing corrugated foamed plastic sheet March 10, 1981
An apparatus for producing a corrugated foamed plastic sheet includes an extruder and a die provided at the extrusion end of the extruder. The die has a plurality of grooves provided on one of its surfaces which make contact with the foamed sheet being produced. The grooves extending fro

 
 
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