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    3.
    发明专利
    未知

    公开(公告)号：DE1911807A1

    公开(公告)日：1970-09-24

    申请号：DE1911807

    申请日：1969-03-08

    Applicant: TORAY INDUSTRIES

    Inventor： TAMAI ISAMU ,  OYAMA MINORU ,  OSAKADA ATSUSHI ,  SHINOHARA YOSUO

    IPC: B29C44/34 ,  C08J9/16 ,  C08J9/228 ,  C08F47/00

    Abstract: A modified cellular particle is provided for molding cellular articles and comprises a partially foamed thermoplastic resin containing excess foaming agent which decomposes upon heating to generate a gas. The cellular particle has a mean specific gravity of 95 - 10 percent of the specific gravity of the resin composition, the polymer is cross-linked to a gel content of 20 - 90 percent and the particle has substantially no surface pores. The particles have a mean volume of 0.01 - 2 cc.

    CROSSLINKED POLYPROPYLENE FOAM
    7.
    发明专利
    CROSSLINKED POLYPROPYLENE FOAM 失效

    公开(公告)号：JPS57212236A

    公开(公告)日：1982-12-27

    申请号：JP9688381

    申请日：1981-06-23

    Applicant: TORAY INDUSTRIES ,  MITSUI PETROCHEMICAL IND

    Inventor： YAMANE TOSHIHIRO ,  TAMAI ISAMU ,  OOKUBO SHIYUNJI ,  SUGAWARA KOUJI

    IPC: C08J9/06 ,  C08J9/22

    Abstract: PURPOSE:To provide a foamed article composed of a polypropylene resin and a polyethylene resin and, having high formability and excellent toughness, wherein the formability, the longitudinal tensile strength, and the longitudinal and transverse tensile elongations satisfy specific formulas. CONSTITUTION:A foamed article composed of 90-10wt%, preferably 85-50% polypropylene resin and 10-90%, preferably 15-50% polyethylene, wherein the formability H/L [H is draw depth (cm) in drawing; L is draw diameter (cm) in drawing], the longitudinal tensile strength X (kg/cm ) of the foam, the longitudinal tensile elongation Sm (%), the transverse tensile elongation St (%), and the apparent density p (g/cm ) of the foam satisfy the following formulas, H/L>= 0.60, X>=19-0.4/p, Sm>=280+4/p and St>=180+4/p.

    CROSSLINKED POLYETHYLENE FOAM SHEET
    8.
    发明专利
    CROSSLINKED POLYETHYLENE FOAM SHEET 失效

    公开(公告)号：JPS57202327A

    公开(公告)日：1982-12-11

    申请号：JP8569981

    申请日：1981-06-05

    Applicant: TORAY INDUSTRIES ,  MITSUI PETROCHEMICAL IND

    Inventor： YAMANE TOSHIHIRO ,  TAMAI ISAMU ,  OOKUBO SHIYUNJI ,  SUGAWARA KOUJI

    IPC: C08J9/06 ,  B29C35/00 ,  B29C59/00

    Abstract: PURPOSE:To obtain the titled foamed article having improved toughness and moldability, composed essentially of a polyethylene having the coefficients representing the toughness and the moldability of higher than specific levels and having a specific gel fraction, and applicable even to the field requiring high performance. CONSTITUTION:A copolymer of ethylene and preferably a 5-20C alpha-olefin (e.g. 1-butene) having a melt flow rate of preferably 0.5-20g/10min, a density of 0.915-0.935g/cm and a melting point of 115-127 deg.C, and obtained by the medium- or low-pressure polymerization process is mixed with a decomposition-type foaming agent (preferably an azodicarbonamide having a decomposition point of >=196 deg.C), to obtain the objective foamed article composed of a polyethylene having the toughness coefficient (r) of the formula of >=5.5, the moldability coefficient (R) of the formula of >=0.55, and a gel fraction of 10-60%. The ratio of ethylene to the alpha-olefin is adjusted to give the polymer having desired density. USE:Heat-insulating steel plate for building use, etc.

    PREPARATION OF FOAMED POLYETHYLENE
    9.
    发明专利
    PREPARATION OF FOAMED POLYETHYLENE 失效

    公开(公告)号：JPS57202326A

    公开(公告)日：1982-12-11

    申请号：JP8569881

    申请日：1981-06-05

    Applicant: TORAY INDUSTRIES ,  MITSUI PETROCHEMICAL IND

    Inventor： YAMANE TOSHIHIRO ,  TAMAI ISAMU ,  OOKUBO SHIYUNJI ,  SUGAWARA KOUJI

    IPC: C08J9/06 ,  C08L23/00 ,  C08L23/04

    Abstract: PURPOSE:To improve the cold formability, impact resistance, and vacuum formability of a foamed polyethylene article, by mixing a specific low-density polyethylene with a specific polyethylene, and crosslinking and foaming the mixture. CONSTITUTION:A mixture of (A) preferably 50-80pts.wt. of a low-density polyethylene having a melting point of and (B) preferably 50-20pts.wt. of a polyethylene composed of ethylene and a 5-20C alpha-olefin and having a melt flow rate of preferably 0.1-50g/10min, a density of 0.915-0.935g/cm , a melting point of 115-127 deg.C and a molecular weight distribution of

    PREPARATION OF FOAMED POLYETHYLENE
    10.
    发明专利
    PREPARATION OF FOAMED POLYETHYLENE 失效

    公开(公告)号：JPS57202325A

    公开(公告)日：1982-12-11

    申请号：JP8569781

    申请日：1981-06-05

    Applicant: TORAY INDUSTRIES ,  MITSUI PETROCHEMICAL IND

    Inventor： YAMANE TOSHIHIRO ,  TAMAI ISAMU ,  OOKUBO SHIYUNJI ,  SUGAWARA KOUJI

    IPC: C08J9/06

    Abstract: PURPOSE:To obtain a foamed polyethylene having excellent thermal and mechanical properties and good weatherability and flexibility, and formable easily, by using a specific polyethylene composed of ethylene and an alpha-olefin. CONSTITUTION:A polyethylene having a melt flow rate of preferably 0.5-20g/ 10min, a density of preferably 0.915-0.935g/cm , and a melting point of preferably 115-127 deg.C, and composed of ethylene and a preferably 5-20C alpha-olefin (e.g. 1-butene) (preferably an ethylene copolymer having a molecular weight distribution of preferably =196 deg.C). The mixture is molten and kneaded at a temperature lower than the decomposition point of the foaming agent and molded. The molded article is crosslinked and foamed by heating at or above the decomposition point of the foaming agent to obtain the objective foamed article.

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