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    Stabilized macromolecular polyacetals and process for making the same
    6.
    发明授权
    Stabilized macromolecular polyacetals and process for making the same 失效
    稳定的大分子聚合物及其制备方法

    公开(公告)号：US3626030A

    公开(公告)日：1971-12-07

    申请号：US3626030D

    申请日：1970-02-17

    申请人： HOECHST AG

    发明人： WOLTERS ERNST ,  LEDERER MICHAEL

    IPC分类号： C08L39/00 ,  C08L59/02 ,  C08F33/08

    CPC分类号： C08L59/02 ,  C08L39/00 ,  C08L59/00 ,  C08L39/04 ,  C08L2666/04

    摘要： Improved stabilization of polyacetals against thermal and oxidative degradation, particularly stabilization of homopolymers of formaldehyde or its cyclic oligomers and of copolymers of trioxane with cyclic ethers or cyclic acetals is obtained by using a stabilizing agent which is a homopolymer of a poly-Nvinyl-azetidinone or a copolymer of an N-vinyl-azetidione and a minor amount of an olefinically unsaturated comonomer or mixtures of such homopolymers and copolymers. The stabilizing agents may be used in an amount of 0.05 to 10 percent by weight. Further improvement in stabilization is achieved by using the poly-Nvinyl-azetidinone stabilizing agents in combination with conventional phenolic stabilizers in that a synergistic effect between the two types of stabilizers is obtained.

    Process for producing polymers of tertiary amides
    9.
    发明授权
    Process for producing polymers of tertiary amides 失效
    生产聚合物聚合物的方法

    公开(公告)号：US3696085A

    公开(公告)日：1972-10-03

    申请号：US3696085D

    申请日：1970-09-04

    申请人： HOECHST AG

    发明人： LEDERER MICHAEL ,  SIEGFRIED SOMMER

    IPC分类号： C08F18/22 ,  C08F26/02 ,  C08F1/11 ,  C08F3/90 ,  C08F15/00

    CPC分类号： C08F26/02 ,  C08F18/22

    摘要： A PROCESS FOR PRODUCING POLYMERS OF TERTIARY AMIDES SELECTED FROM THE GROUP CONSISTING OF N-VINYL LACTAMS AND N-VINYL AMIDES OF THE FORMULA:

    CH2=CH-N(-R2)-CO-R1

    IN WHICH R1 REPRESENTS A MEMBER SELECTED FROM THE GROUP CONSISTING OF HYDROGEN AND AN ALIPHATIC GROUP CONTAINING 1 TO 20 CARBON ATOMS AND R2 REPRESENTS AN ALIPHATIC GROUP CONTAINING 1 TO 20 CARBON ATOMS IS DISCLOSED. THE POLYMERS MAY BE HOMOPOLYMERS OR COPOLYMERS OF THE TERTIARY AMIDES WITH UP TO 50 PERCENT CALCULATED ON THE WEIGHT OF THE TERTIARY AMIDES OF MONOOLEFINICALLY UNSATURATED COMONOMERS. POLYMERIZATION MAY BE EFFECTED AT A TEMPERATURE OF 0* TO 150*C. IN THE PRESENCE OF 0.001 TO 5% BY WEIGHT, BASED ON THE WEIGHT OF MONOMERS, OF A FREE RADICAL POLYMERIZATION CATALYST AND IN THE PRESENCE OF A SATURATED ALIPHATIC HYDROCARBON CONTAINING 3 TO 20 CARBON ATOMS. THE POLYMERS OBTAINED ARE IN PULVERULENT FORM AND THEIR AQUEOUS SOLUTIONS EXHIBIT RELATIVELY LOW SURFACE TENSIONS.