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    Process for producing homo-and copolymers of cyclic acetals
    2.
    发明授权
    Process for producing homo-and copolymers of cyclic acetals 失效
    生产循环乙醇的共聚物的方法

    公开(公告)号：US3848020A

    公开(公告)日：1974-11-12

    申请号：US28155972

    申请日：1972-08-17

    Applicant: HOECHST AG

    Inventor： BURG K ,  SCHLAF H

    IPC: C08G2/00 ,  C08G2/06 ,  C08G4/00 ,  C08G1/04 ,  C08G1/20

    CPC classification number: C08G4/00 ,  C08G2/10

    Abstract: 1. IN A PROCESS FOR PRODUCING MOLDABLE HOMOPOLYMERS OF TRIOXANE OR COPOLYMERS COMPRISING A MAJOR AMOUNT OF UNITS DERIVED FROM TRIOXANE AND A MINOR AMOUNT OF UNITS DERIVED FROM A LINEAR ACETAL OF AN A,W-DIOL OR A CYCLIC ACETAL OF THE FORMULA

    O
    WHEREIN R1, R2, R3 AND R4 MAY BE THE SAME OR DIFFERENT REPRESENT HYDROGEN OR AN ALKYL GROUP WHICH CAN BE HALOGEN-SUBSTITUTED, R5 REPRESENTS AN OXYMETHYLENE RADICAL WHICH CAN BE SUBSTITUTED BY AN ALKYL OR HALOGEN-SUBSTITUTED ALKYL GROUP, AND N IS 1 TO 3, OR WHEN N IS 1, R5 CAN BE THE RADICAL -(O-CH2CH2)M-OCH2- WHEREIN M IS 1 TO 3, AT A TEMPERATURE BETWEEN THE MELTING POINT AND BOILING POINT OF THE MONOMER OR MONOMER MIXTURE IN THE PRESENCE OF A PROTONIC ACID, THE IMPROVEMENT WHICH CONSISTS IN USING AN ANHYDROUS PERFLUOROALKYL SULFONIC ACID WITH 1 TO 18 CARBON ATOMS AS THE PROTONIC ACID.

    Thermoplastic molding composition on the basis of poly(oxymethylenes)
    4.
    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.

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