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    Process for the preparation of polylactam foams
    3.
    发明授权
    Process for the preparation of polylactam foams 失效
    制备聚氨酯乳液的方法

    公开(公告)号：US3645928A

    公开(公告)日：1972-02-29

    申请号：US3645928D

    申请日：1969-07-16

    Applicant: TORAY INDUSTRIES

    Inventor： WAKAMURA NOBUO ,  TANAKA TAKASHI ,  OKADA HIROSHI ,  OSAKADA ATSUSHI

    IPC: C08G69/20 ,  C08J9/04 ,  C08J1/20 ,  C08J1/26

    CPC classification number: C08J9/04 ,  C08G69/20 ,  C08J2377/02

    Abstract: AN IMPROVED PROCESS IS PROVIDED FOR THE PREPARATION OF POLYLACTAM FOAMS IN WHICH E-CAPROLACTAM OR A MIXTURE OF LACTAMS CONTAINING MORE THAN 50 MOL PERCENT OF E-CAPROLACTAM IS ANIONICALLY POLYMERIZED IN THE PRESENCE OF AN ALKALI CATALYST, A BLOWING AGEN AND A PROMOTER AT A TEMPERATURE OF ABOUT 100-180*C. THE IMPROVED PROCESS IS PARTICULARLY CHARACTERIZED BY THE USE OF A PROMOTER WHICH WHEN ADDED TO A MIXTURE OF LACTAM AND ALKALI CATALYSTS CAUSES THE MIXTURE TO SOLIDIFY DUE TO CRYSTALLIZATION WITHIN 3 MINUTES AND TO PRODUCE A POLYLACTAM HAVING A RELATIVE VISCOSITY OF AT LEAST 3 WHEN A CONVERSION REACHES EQUILIBRIUM. THE POLYLACTAM FOAMS OF THIS INVENTION EXHIBIT IMPROVED MECHANICAL AND CHEMICAL PROPERTIES IN COMPARISON WITH THE POLYLACTAM FOAMS OF THE PRIOR ART WHICH MAKE THEM ESPECIALLY USEFUL FOR THE MANUFACTURE OF LOW DENSITY ARTICLES REQUIRING RELATIVELY HIGH STRENGTH AND CHEMICAL RESISTANCE.

    Polyamide resin foam and a method of preparing the same
    4.
    发明授权
    Polyamide resin foam and a method of preparing the same 失效
    聚酰胺树脂泡沫及其制备方法

    公开(公告)号：US3600336A

    公开(公告)日：1971-08-17

    申请号：US3600336D

    申请日：1968-02-19

    Applicant: TORAY INDUSTRIES

    Inventor： OKADA HIROSHI ,  OSAKADA ATSUSHI

    IPC: C08F283/04 ,  C08G69/00 ,  C08J9/06 ,  C08G53/10 ,  C08G41/04

    CPC classification number: C08G69/00 ,  C08F283/04 ,  C08J9/06 ,  Y10S264/05 ,  Y10S264/18 ,  Y10S521/916

    Abstract: A POLYAMIDE RESIN FOAM COMPRISING A POLYAMIDE RESIN BASE CROSS-LINKED WITH AN ORGANIC COMPOUND HAVING IN THE MOLECULE AT LEAST TWO REACTIVE UNSATURATED DOUBLE BONDS. A METHOD OF PREPARING A POLYAMIDE RESIN FOAM WHICH COMPRISES UNIFORMLY MIXING A POLYAMIDE WITH AN ORGANIC COMPOUND HAVING IN THE MOLECULE AT LEAST TWO REACTIVE UNSATURATED DOUBLE BONDS AND A CHEMICAL FOAMING AGENT AT A TEMPERATURE HIGHER THAN THE SOFTENING POINT OF SAID POLYAMIDE, IRRADIATING SAID MIXTURE WITH IONZING RAYS TO EFFECT A CROSS-LINKING OF THE POLYAMIDE, AND HEATING THE MIXTURE TO A TEMPERATURE HIGHER THAN THE DECOMPOSITION TEMPERATURE OF SAID FOAMING AGENT TO CAUSE FOAMING.

    THERMOPLASTIC RESIN FOAM
    6.
    发明专利
    THERMOPLASTIC RESIN FOAM 未知

    公开(公告)号：GB1210637A

    公开(公告)日：1970-10-28

    申请号：GB3146069

    申请日：1969-06-21

    Applicant: TORAY INDUSTRIES

    Inventor： OKADA HIROSHI ,  OSAKADA ATSUSHI ,  MINAMI SATOYUKI ,  AOKI TOSHIKAZU ,  HISAMORI TETSUO ,  KOYANAGI HIRONOBU ,  OTSUKA HIROMI

    IPC: B32B27/00 ,  C08J9/06 ,  C08J9/34

    Abstract: 1,210,637. Foam laminates. TORAY INDUSTRIES Inc. 21 June, 1969, No. 31460/69. Heading B5N. [Also in Division C3] Foams are made by laminating thermoplastic resin films to both surfaces of a thermoplastic resin sheet containing a foaming agent, whose decomposition temperature is above the softening temperature of the resin(s), cross-linking the films before, during, or after lamination, and heating to cause foaming. The central sheet may contain 0À1-60 wt. per cent of foaming agent. Foaming agents may be included in the outer films. The resins can be cross-linked before and/or after lamination by including 0À1-5 wt. per cent of cross-linking agent and/or by irradiating to 2-40 Mrad. dosage; crosslinking accelerators may be included. A single heating operation, e.g. by hot air, radiant heat or a molten salt or alloy bath, may serve both for cross-linking and foaming. Lists of foaming, cross-linking and accelerating agents are given; other additives present may be weathering agents, extenders, plasticizers, pigments, flameretardants, antistatic agents and ultraviolet absorbers. Films and sheets may be formed by extrusion, calendering or rolling a mixture of resin and additives; and may be laminated by heat and pressure or by extrusion. The foamable central sheet may be a multi-layer construction including non-foamable sheets. The outer films may be 1-1000 microns thick after the foaming operation and the central layer may be at least 300 microns thick before foaming. Specified thermoplastic resins are polyethylene, polypropylene, polybutene, poly- 4-methylpentene-1 and copolymers of olefins with vinyl acetate, vinyl chloride and alkyl acrylates and methacrylates; and polyvinyl chloride.

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