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    12.
    发明专利
    未知

    公开(公告)号：DE1719234A1

    公开(公告)日：1972-03-16

    申请号：DE1719234

    申请日：1968-02-15

    Applicant: TORAY INDUSTRIES

    Inventor： OKADA HIROSHI ,  OSAKADA ATSUSHI

    IPC: C08F283/04 ,  C08G69/00 ,  C08J9/06

    Abstract: 1,178,784. Cross-linked polyamide foams. TOYO RAYON K.K. 14 Feb., 1968 [18 Feb., 1967; 15 May, 1967], No. 7326/68. Headings C3C and C3G. A foam comprises a polyamide having a gel percentage (which is defined in the Specification) of at least 40% by wt., cross-linked by graft polymerization with an organic compound having at least two double bonds in the molecule and has at least 50% by vol. of closed cells, an average cell size of 10-800 Á and a density of 0À02-0À5. The foam may be prepared by mixing the polyamide, the organic compound and a heat decomposable foaming agent at a temperature higher than the softening point of the polyamide, irradiating the mixture with 0À5-30 megarads of ionizing rays and heating the mixture to foam the polyamide. The polyamide may be a copolymer of #-caprolactam and hexamethylene diammonium adipate and/or sebacate with optionally lauryl lactam, polylauryl lactam or polycaprolactam. The organic compound may be diallyl phthalate, maleate, adipate, sebacate, succinate, or itaconate; diethylene glycol diacrylate, triailyl cyanurate, N,N 1 - methylenebisacrylamide, N,N 1 - hexamethylenebisacrylamide, N,N 1 - phenylenebismethacrylamide, N - methyl - N - allylacrylamide, or N,N 1 - diphenyl - or propyl - N,N 1 - hexamethylenebisacrylamide. The foaming agent may be azodicarbonamide, barium azodicarboxylate, trihydrazino - sym - triazine, hydrazodicarbonamide, 4,4 1 - oxybis (benzenesulphonylsemicarbazide) or N,N 1 -dinitrosorentamethylene tetramine. The ionizing rays may be electron or gamma rays. The foam may be in the form of a sheet.

    16.
    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.

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