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    Thermoplastic molding composition on the basis of poly(oxymethylenes)
    1.
    发明授权
    Thermoplastic molding composition on the basis of poly(oxymethylenes) 失效
    基于聚（甲基乙烯）的热塑性成型组合物

    公开(公告)号：US3848021A

    公开(公告)日：1974-11-12

    申请号：US28272072

    申请日：1972-08-22

    Applicant: HOECHST AG

    Inventor： SEXTRO G ,  BURG K

    IPC: C08L59/00 ,  C08J3/20 ,  C08L59/02 ,  C08G37/02

    CPC classification number: C08L59/02 ,  C08L59/00 ,  C08L2666/22

    Abstract: 1. PROCESS FOR THE MANUFACTURE OF A THERMOPLASTIC MOLDING COMPOSITION ON THE BASIS OF POLY(OXYMETHYLENES), WHICH COMPRISES MIXING (A) FROM 99.9 TO 80 WEIGHT PERCENT OF A LINEAR POLY (OXYMETHYLENE), WHICH MAY CONTAIN UP TO 20 WEIGHT PERCENT, RELATIVE TO THE SAID POLY(OXYMETHYLENE), OF OXYALKYLENE GROUPS HAVING FROM 2 TO 8 ADJACENT CARBON ATOMS, AND (B) FROM 0.01 TO 20 WEIGHT PERCENT OF A POLY(OXYMETHYLENE) CONTAINING FROM 0.1 TO 30 WEIGHT PERCENT, RELATIVE TO THE SAID POLY(OXYMETHYLENE), OF POLYETHER SEGMENTS DERIVED FROM CYCLIC ETHERS HAVING 3 TO 5 RINGMEMBERS AND HAVING A NUMBER AVERAGE MOLECULAR WEIGHT OF AT LEAST 500, AND UP TO 20 WEIGHT PERCENT OF OXYALKYLENE GROUPS HAVING FROM 2 TO 8 ADJACENT CARBON ATOMS, EACH OF THE COMPONENTS BEING IN A PULVERULENT OR GRANULATED FORM AT A TEMPERATURE BELOW 100*C., AND SUBSEQUENTLY MELTING AND HOMOGENIZING THE MIXTURE IN A MIXING DEVICE AT A TEMPERATURE OF FROM 150* TO 250*C., AND THEN REMOVING IT FROM THE MIXING DEVICE.

    3.
    发明专利
    未知

    公开(公告)号：DK351578A

    公开(公告)日：1979-02-11

    申请号：DK351578

    申请日：1978-08-09

    Applicant: HOECHST AG

    Inventor： BURG K ,  HELLER A ,  SABEL H D ,  SCHLAF H ,  SEXTRO G

    IPC: C08J3/14 ,  C08J3/12 ,  C08L59/04 ,  C08J

    Abstract: Oxymethylene polymers (POM) are obtained in a granular form, by cooling a POM solution or dispersion, whose temperature is above the sintering temperature of the POM, to a temperature slightly below the sintering temperature of the POM, and extracting from the suspension obtained only those POM particles which show a grain diameter of more than 70 mu m. As solvent or dispersing agent as well as precipitating and cooling agent there is used a mixture of methanol and water with a methanol content of at least 75% by weight. The POM obtained is suitable as engineering plastic material for the manufacture of shaped articles having improved mechanical properties.

    5.
    发明专利
    未知

    公开(公告)号：SE388866B

    公开(公告)日：1976-10-18

    申请号：SE7302422

    申请日：1973-02-21

    Applicant: HOECHST AG

    Inventor： SEXTRO G ,  BURG K ,  KERN R ,  SCHMIDT H ,  WOLTERS E

    IPC: C08L59/00 ,  C08L59/02

    Abstract: A thermoplastic molding composition is composed of a linear poly(oxymethylene) and a graft copolymer the side chains of which consist essentially of oxymethylene groups. The said graft copolymer acts as a nucleating agent; its effectiveness is dependent on its amount, molecular weight and degree of grafting. Molded articles made of said composition show improved mechanical properties.

    6.
    发明专利
    未知

    公开(公告)号：BR7501084A

    公开(公告)日：1975-12-02

    申请号：BR7501084

    申请日：1975-02-21

    Applicant: HOECHST AG

    Inventor： SEXTRO G ,  BURG K ,  WOLTERS E

    IPC: C08L59/00 ,  C08G2/00 ,  C08G2/18 ,  C08G2/36 ,  C08K5/09 ,  C08K5/098 ,  C08G2/10 ,  C08K5/17

    Abstract: Oxymethylene copolymer having heat and hydrolysis resistant terminal groups is prepared by heating the polymers present in a liquid phase, whereby a thermal degradation of the unstable terminal groups takes place. The degradation is advantageously effected in the presence of a calcium or magnesium salt of an aliphatic carboxylic acid of low molecular weight. The oxymethylene copolymers are suitable as engineering plastic for preparing semi-finished products and finished products.

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