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    • 1. 发明授权
    • Expanded polypropylene resin beads and a molded article
    • 膨胀聚丙烯树脂珠和模塑制品
    • US06313184B1
    • 2001-11-06
    • US09554510
    • 2000-05-17
    • Hidehiro SasakiMasakazu SakaguchiMitsuhiro AkiyamaHisao Tokoro
    • Hidehiro SasakiMasakazu SakaguchiMitsuhiro AkiyamaHisao Tokoro
    • C08J900
    • C08J9/18C08J9/16C08J2203/06C08J2323/12
    • Propylene resin beads for molding expansion molded articles having improved high temperature resistance include as base resin metallocene-catalyzed copolymers of propylene with at least one or more of ethylene and ∝-olefins of 4 to 20 carbon atoms. The metallocene-catalyzed propylene copolymers are isotactic random copolymers characterized by a melting point higher than 140° C. to 160° C. and a melt flow rate (MFR) of not higher than 12 g/10 minutes, especially, 0.5 to 12 g/10 minutes. Expansion molded articles produced by expansion molding the expanded beads have a high temperature degree of deflection which is lower than that of metallocene-catalyzed propylene homopolymers and lower than that of Ziegler-Natta-catalyzed random propylene copolymers having the same comonomers and melting point.
    • 用于模塑具有改进的耐高温性的发泡模塑制品的丙烯树脂珠粒包括丙烯与至少一种或多种乙烯和4-20个碳原子的丙烯的基础树脂金属茂催化的共聚物。 茂金属催化的丙烯共聚物是等温无规共聚物,其特征在于熔点高于140℃至160℃,熔体流动速率(MFR)不高于12g / 10分钟,特别是0.5-12g /10分钟。 通过膨胀成型发泡珠粒产生的膨胀模制品具有高于茂金属催化的丙烯均聚物的高温度偏转,并且低于具有相同共聚单体和熔点的齐格勒 - 纳塔催化的无规丙烯共聚物。
    • 6. 发明授权
    • Uncrosslinked polyethylene particles for the production of expanded
particles and uncrosslinked polyethylene expanded particles
    • US5459169A
    • 1995-10-17
    • US208677
    • 1994-03-11
    • Hisao TokoroKazuo TsurugaiHidehiro SasakiMasaharu Oikawa
    • Hisao TokoroKazuo TsurugaiHidehiro SasakiMasaharu Oikawa
    • C08J9/18C08J9/22C08L23/06C08L23/08C08J9/16
    • C08L23/0815C08J9/18C08J2323/06C08L2205/02C08L2205/03C08L23/06
    • 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.sup.3 and up to and including 0.940 g/cm.sup.3 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.degree. C. at 10.degree. C./min and then is cooled to room temperature at 10.degree. C./min, heating is again carried out to 200.degree. C. at 10.degree. C./min and during the second heating the measurement for the DSC curve is carried out, q.sub.1 /q.sub.total .gtoreq.0.5 wherein q.sub.1 stands for the quantity of heat absorbed in the range of the DSC curve of from 50.degree. C. to (the melting point-10) .degree. C. in terms of J/g and q.sub.total stands for the total quantity of absorbed heat of the DSC curve of from 50.degree. 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.degree. C. or higher is 5.degree. 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.