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    Process for producing foamed and molded article of polypropylene resin
    2.
    发明授权
    Process for producing foamed and molded article of polypropylene resin 失效
    生产聚丙烯树脂发泡成型制品的方法

    公开(公告)号：US4440703A

    公开(公告)日：1984-04-03

    申请号：US405027

    申请日：1982-08-04

    申请人： Hiroyuki Akiyama ,  Kuninori Hirosawa ,  Hideki Kuwabara

    发明人： Hiroyuki Akiyama ,  Kuninori Hirosawa ,  Hideki Kuwabara

    IPC分类号： C08J9/22 ,  B29C44/00 ,  B29C59/00 ,  B29C67/00 ,  C08J9/232 ,  B29D27/00

    CPC分类号： C08J9/232 ,  B29K2023/00 ,  B29K2023/12 ,  C08J2323/16 ,  Y10S264/05 ,  Y10S264/15 ,  Y10S264/16

    摘要： 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 ethylene content of from 1 to 30% by weight as a base resin with an inorganic gas or a gaseous mixture of the inorganic gas and a volatile blowing agent thereby to impart an elevated pressure to the inside of said particles, thereafter filling said particles in a mold capable of enclosing the particles but allowing escape of gases therefrom, and then heating said particles to expand them to the configuration of the mold.

    摘要翻译： 一种聚丙烯树脂的发泡成型体的制造方法，其特征在于，对熔融指数值为0.1〜25的乙烯/丙烯共聚物的预发泡粒子进行加压，结晶潜热不超过28cal / g，乙烯含量为1至30重量％，作为基础树脂与无机气体或无机气体和挥发性发泡剂的气体混合物，从而将高压施加到所述颗粒的内部，然后将所述 能够封闭颗粒但允许气体逸出的模具中的颗粒，然后加热所述颗粒以将它们扩展到模具的构型。

    Process for producing pre-foamed particles of polyolefin resin
    3.
    发明授权
    Process for producing pre-foamed particles of polyolefin resin 失效
    生产聚烯烃树脂预发泡颗粒的方法

    公开(公告)号：US4436840A

    公开(公告)日：1984-03-13

    申请号：US420874

    申请日：1982-09-21

    申请人： Hiroyuki Akiyama ,  Sumio Shimada ,  Kuninori Hirosawa ,  Hideki Kuwabara

    发明人： Hiroyuki Akiyama ,  Sumio Shimada ,  Kuninori Hirosawa ,  Hideki Kuwabara

    IPC分类号： B29C67/00 ,  B29B9/16 ,  B29C44/00 ,  B29C59/00 ,  B29K23/00 ,  B29K105/04 ,  C08J9/16 ,  C08J9/18 ,  C08J9/22 ,  B29D27/00

    CPC分类号： C08J9/18 ,  C08J2203/142 ,  C08J2323/02 ,  Y10S264/09

    摘要： 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 end of the vessel and releasing the resin particles and the dispersing medium simultaneously into an atmosphere kept at a lower pressure than the inside pressure of the vessel; the improvement wherein the pressure of the inside of the vessel after opening its one end is maintained at a substantially constant pressure which is at least 0.7 times the vapor pressure of the blowing agent before opening the end of the vessel.

    摘要翻译： 在制造聚烯烃树脂的预发泡颗粒的方法中，其包括将挥发性发泡剂浸入聚烯烃树脂颗粒中，同时将树脂颗粒和发泡剂在密封容器中分散在分散介质中的加热分散介质中， 并将树脂颗粒和分散介质同时放入保持在低于容器内部压力的压力下的气氛中; 改进之处在于，在打开其一端之后，容器内部的压力保持在打开容器末端之前的发泡剂的蒸气压f的至少0.7倍的基本恒定的压力。

    Pre-foamed particles of polypropylene resin and process for production thereof
    4.
    发明授权
    Pre-foamed particles of polypropylene resin and process for production thereof 失效
    聚丙烯树脂的预发泡颗粒及其生产方法

    公开(公告)号：US4379859A

    公开(公告)日：1983-04-12

    申请号：US322917

    申请日：1981-11-19

    申请人： Kuninori Hirosawa ,  Sumio Shimada

    发明人： Kuninori Hirosawa ,  Sumio Shimada

    IPC分类号： C08J9/00 ,  C08J9/16 ,  C08J9/18

    CPC分类号： C08J9/0061 ,  C08J9/16 ,  C08J9/18 ,  C08J2323/16 ,  C08J2423/00

    摘要： 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 acetate copolymer as a base resin; and a process for producing pre-foamed particles of a polypropylene resin, which comprises dispersing substantially non-crosslinked particles of the polypropylene resin 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 acetate copolymer and a volatile blowing agent in water in the presence of a dispersing agent within a closed vessel; heating the dispersion to a temperature above a temperature at which the resin particles soften, thereby to impregnated the blowing agent in the resin particles; and while maintaining the pressure of the inside of the vessel higher than the vapor pressure of the blowing agent, opening one end of the vessel to release the resin particles and water simultaneously into an atmosphere kept at a lower pressure than the inside of the vessel.

    摘要翻译： 聚丙烯树脂的基本未交联的预发泡颗粒，其特征在于它们由乙烯/丙烯无规共聚物或乙烯/丙烯无规共聚物与低密度聚乙烯和/或乙烯/乙酸乙烯酯 共聚物作为基础树脂; 以及生产聚丙烯树脂的预发泡颗粒的方法，其包括将由乙烯/丙烯无规共聚物或乙烯/丙烯无规共聚物与乙烯/丙烯无规共聚物的混合物的基本上非交联的颗粒分散到低密度聚乙烯和 /或乙烯/乙酸乙烯酯共聚物和挥发性发泡剂在水中，在分散剂存在下在封闭容器内; 将分散体加热到高于树脂颗粒软化温度的温度，从而将发泡剂浸渍在树脂颗粒中; 并且在保持容器内部的压力高于发泡剂的蒸汽压力的同时，打开容器的一端以同时将树脂颗粒和水释放到保持在比容器内部更低的压力的气氛中。