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公开(公告)号：CA2024228C
公开(公告)日：1996-06-18
申请号：CA2024228
申请日：1990-08-29
Applicant: JSP CORP
Inventor： KUWABARA HIDEKI , TSURUGAI KAZUO , NAITO MASATO , SASAKI HIDEHIRO
Abstract: A process for the production of expanded resin particles is disclosed, wherein an aqueous dispersion containing expandable particles of a polyolefin resin is discharged at a temperature higher than the softening point of the resin from a high pressure condition to a low pressure condition to expand the expandable particles and wherein the expandable particles contain fine particles of an inorganic material coated with an agent selected from isopropyltriisostearic titanate, tetraoctadecyl titanate, acetoalkoxyaluminum diisopropylates, stearic acid, methyltrimethoxysilane, methyltriethoxysilane, ethyltriethoxysilane, phenyltriethoxysilane and vinyltriethoxysilane.
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公开(公告)号：CA2024228A1
公开(公告)日：1991-03-01
申请号：CA2024228
申请日：1990-08-29
Applicant: JSP CORP
Inventor： KUWABARA HIDEKI , TSURUGAI KAZUO , NAITO MASATO , SASAKI HIDEHIRO
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公开(公告)号：DE69619070D1
公开(公告)日：2002-03-21
申请号：DE69619070
申请日：1996-04-05
Applicant: JSP CORP
Inventor： TSURUGAI KAZUO , TOKORO HISAO , OIKAWA MASAHARU
Abstract: The molded articles of foamed particles, which are produced by using foamed particles composed of a polypropylene-based polymer, have had excellent cushioning characteristics and impact resilience, but have been not always satisfactory in stiffness such as compressive strength. The invention is directed to foamed particles comprising a polypropylene homopolymer as a base resin and having a tensile modulus of 15,000-25,000 kg/cm and a crystal structure that an inherent peak and a high-temperature peak appear as endothermic peaks on a DSC curve obtained by differential scanning calorimetry of the foamed particles. A quantity of heat at the high-temperature peak is 30-60 J/g. A molded article of foamed particles according to the invention is obtained by using the foamed particles as described above and molding them, and has a density of 0.01-0.3 g/cm and a tensile modulus of 15,000-25,000 kg/cm . It has a crystal structure that an inherent peak and a high-temperature peak appear on a DSC curve obtained by its differential scanning calorimetry like the case of the foamed particles. As with the foamed particles, a quantity of heat at the high-temperature peak is 30-60 J/g.
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公开(公告)号：DE69408548D1
公开(公告)日：1998-03-26
申请号：DE69408548
申请日：1994-03-11
Applicant: JSP CORP
Inventor： TOKORO HISAO , TSURUGAI KAZUO , SASAKI HIDEHIRO , OIKAWA MASAHARU
Abstract: The present invention relates to uncrosslinked polyethylene particles for the production of expanded particles that can easily and securely produce expanded particles which can be molded without applying a special internal pressure, are excellent in moldability, such as secondary expansion, fusion and dimensional accuracy, and have a high expansion rate and to uncrosslinked polyethylene expanded particles made of said uncrosslinked polyethylene particles. The present uncrosslinked polyethylene particles for the production of expanded particles are resin particles whose base resin is an uncrosslinked polyethylene having a density of over 0.920 g/cm and up to and including 0.940 g/cm and wherein, in the DSC curve that is obtained by using a differential scanning calorimeter in such a manner that after 1 to 10 mg of the resin particles is heated to 200 DEG C at 10 DEG C/min and then is cooled to room temperature at 10 DEG C/min, heating is again carried out to 200 DEG C at 10 DEG C/min and during the second heating the measurement for the DSC curve is carried out, q1/qtotal >/= 0.5 wherein q1 stands for the quantity of heat absorbed in the range of the DSC curve of from 50 DEG C to (the melting point - 10) DEG C in terms of J/g and qtotal stands for the total quantity of absorbed heat of the DSC curve of from 50 DEG C to the temperature at which the melting is completed in terms of J/g is satisfied, and the temperature width at 1/2 of the peak height h of the endothermic peak whose apex is at 115 DEG C or higher is 5 DEG C or more. Further, the present uncrosslinked polyethylene expanded particles are obtained by impregnating the above resin particles with an expanding agent, dispersing the resin particles in a dispersing agent in a closed vessel, and discharging the resin particles and the dispersing medium from the vessel at a temperature equal to or over the softening temperature of the resin particles into a low-pressure region.
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公开(公告)号：EP0918066A4
公开(公告)日：2002-06-19
申请号：EP97934755
申请日：1997-08-08
Applicant: JSP CORP
Inventor： TSURUGAI KAZUO , TOKORO HISAO
CPC classification number: C08J9/232 , C08J9/228 , C08J2323/10 , C08J2323/12 , C08L23/12 , C08L2314/06 , Y10S526/943 , Y10T428/249953 , C08L2666/04
Abstract: A conventional shock absorbing material formed from a foamed molding of polypropylene resin particles has an excellent cushioning property and impact resilience as compared with shock absorbing materials formed of other material resins, but is not satisfactory in terms of rigidity and energy absorbing efficiency. The present invention provides a shock absorbing material formed from an in-mold formed molding manufactured by using foamed particles, of which a base material resin is a propylene homopolymer prepared with the use of a metallocene polymerization catalyst. The base material resin has a tensile elastic modulus of 15000 kgf/cm2 or more, and the in-mold formed molding has such a crystal structure that an intrinsic peak a and a high temperature peak b appear as endothermic peaks in the DSC curve obtained by differential scanning calorimetry of the molding. The high temperature peak b appears on a higher temperature side than the inherent peak a does, and has a heat quantity of 25 J/g or more.
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Patent Agency Ranking
公开(公告)号：DE602004000018D1
公开(公告)日：2005-07-14
申请号：DE602004000018
申请日：2004-02-26
Applicant: JSP CORP
Inventor： YOSHIZAWA TAKU , SASAKI KAZUTOSHI , TSURUGAI KAZUO
IPC: C08J9/228 , C08J3/12 , C08J9/00 , C08K3/04 , C08K5/3435 , C08K5/3492 , C08L23/00 , C08L23/10
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公开(公告)号：DE69727682T2
公开(公告)日：2004-12-02
申请号：DE69727682
申请日：1997-08-08
Applicant: JSP CORP
Inventor： TSURUGAI KAZUO , TOKORO HISAO
Abstract: A shock-absorbing material composed of an expansion-molded article of polypropylene resin particles is excellent in shock-absorbing property and impact resilience compared with shock-absorbing materials composed of other resin materials, but has not been said to be satisfactory in stiffness and energy absorption efficiency. The present invention relates to a shock-absorbing material composed of an expansion-molded article produced by using foamed particles comprising, as a base resin, a polypropylene homopolymer obtained by using a metallocene polymerization catalyst. The base resin has a tensile modulus of at least 15,000 kgf/cm , and the expansion-molded article has a crystal structure that an inherent peak a and a high-temperature peak b appear as endothermic peaks on a DSC curve obtained by the differential scanning calorimetry of the molded article. The high-temperature peak b is a peak appeared on the temperature side higher than a temperature corresponding to the inherent peak a, and the quantity of heat at the high-temperature peak is at least 25 J/g.
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公开(公告)号：DE69727377D1
公开(公告)日：2004-03-04
申请号：DE69727377
申请日：1997-06-11
Applicant: JSP CORP
Inventor： OIKAWA MASAHARU , TSURUGAI KAZUO , TOKORO HISAO
Abstract: When it is intended to obtain foamed particles having a high expansion ratio upon the production of foamed particles of a polyolefin resin, there has been a problem that foamed particles uneven in cell diameter are produced. Any molded article produced with such foamed particles has involved a drawback that it is poor in dimensional stability, and its surface profile becomes uneven. The invention relates to foamed particles comprising a polyolefin resin as a base resin, wherein the base resin contains a metal salt (excluding alkali metal salts) of boric acid in such a manner that the content of the metal salt of boric acid in the raw resin amounts to 50-50,000 ppm. Zinc borate, magnesium borate or the like is used as the metal salt of boric acid. The foamed particles are obtained by using a polyolefin resin containing the metal salt of boric acid to prepare resin particles, dispersing the resin particles in a dispersion medium in a closed vessel and at the same time impregnating the resin particles with a foaming agent, holding the resin particles in a heated and pressurized atmosphere, and then releasing the resin particles together with the dispersion medium into an atmosphere of a pressure lower than the internal pressure of the vessel to expand the resin particles.
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公开(公告)号：DE69619070T2
公开(公告)日：2002-07-18
申请号：DE69619070
申请日：1996-04-05
Applicant: JSP CORP
Inventor： TSURUGAI KAZUO , TOKORO HISAO , OIKAWA MASAHARU
Abstract: The molded articles of foamed particles, which are produced by using foamed particles composed of a polypropylene-based polymer, have had excellent cushioning characteristics and impact resilience, but have been not always satisfactory in stiffness such as compressive strength. The invention is directed to foamed particles comprising a polypropylene homopolymer as a base resin and having a tensile modulus of 15,000-25,000 kg/cm and a crystal structure that an inherent peak and a high-temperature peak appear as endothermic peaks on a DSC curve obtained by differential scanning calorimetry of the foamed particles. A quantity of heat at the high-temperature peak is 30-60 J/g. A molded article of foamed particles according to the invention is obtained by using the foamed particles as described above and molding them, and has a density of 0.01-0.3 g/cm and a tensile modulus of 15,000-25,000 kg/cm . It has a crystal structure that an inherent peak and a high-temperature peak appear on a DSC curve obtained by its differential scanning calorimetry like the case of the foamed particles. As with the foamed particles, a quantity of heat at the high-temperature peak is 30-60 J/g.
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公开(公告)号：DE602004000018T2
公开(公告)日：2006-05-04
申请号：DE602004000018
申请日：2004-02-26
Applicant: JSP CORP
Inventor： YOSHIZAWA TAKU , SASAKI KAZUTOSHI , TSURUGAI KAZUO
IPC: C08J9/228 , C08K5/3492 , C08J3/12 , C08J9/00 , C08K3/04 , C08K5/3435 , C08L23/00 , C08L23/10
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