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    Stabilized macromolecular polyacetals and process for making the same
    1.
    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

    Applicant: HOECHST AG

    Inventor： WOLTERS ERNST ,  LEDERER MICHAEL

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

    CPC classification number: C08L59/02 ,  C08L39/00 ,  C08L59/00 ,  C08L39/04 ,  C08L2666/04

    Abstract: 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.

    Thermoplastic moulding composition on the basis of polyoxymethylene
    3.
    发明授权
    Thermoplastic moulding composition on the basis of polyoxymethylene 失效
    基于聚甲醛的热塑性成型组合物

    公开(公告)号：US3872182A

    公开(公告)日：1975-03-18

    申请号：US33281073

    申请日：1973-02-16

    Applicant: HOECHST AG

    Inventor： SEXTRO GUNTER ,  BURG KARLHEINZ ,  KERN RUDOLF ,  SCHMIDT HEINZ ,  WOLTERS ERNST

    IPC: C08L59/00 ,  C08L59/02 ,  C08G37/04

    CPC classification number: C08L59/02 ,  C08L59/00 ,  C08L2666/24

    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.

    Abstract translation: 热塑性模塑组合物由线性聚（甲醛）和其侧链主要由氧亚甲基组成的接枝共聚物组成。 所述接枝共聚物用作成核剂; 其有效性取决于其量，分子量和接枝度。 由所述组合物制成的模制品显示改进的机械性能。

    6.
    发明专利
    未知

    公开(公告)号：FI56021C

    公开(公告)日：1979-11-12

    申请号：FI242771

    申请日：1971-08-31

    Applicant: HOECHST AG

    Inventor： WOLTERS ERNST ,  ROOS GUENTHER

    IPC: C08L71/02 ,  C08G2/08 ,  C08G2/10 ,  C08K5/103 ,  C08K5/134 ,  C08K5/10 ,  C08L59/00

    Abstract: Procedure for obtaining stabilized polyoxymethylene molding compounds, characterized in that it comprises: A) mixing: 1) 0.05 to 4% by weight, based on polyoxymethylene, of compounds of the formula ** formula ** Where R1 is a residue of alkyl with 1 to 6 carbon atoms, R2 is a hydrogen atom or an alkyl residue with 1 to 6 carbon atoms, A is a bi- to hexavalent aliphatic hydrocarbon residue, with 1 to 12 carbon atoms, m is 0 or an integer from 1 to 6 and n corresponds to the valence of A, with: 2) 0.01 to 3% by weight, based on polyoxymethylene, of alkaline earth salts of carboxylic acids with 10 to 20 carbon atoms and/or alkaline earth hydroxides and, B) incorporating the obtained mixture into the polyoxymethylene as a stabilizer, either in powder form, through mixers, for example dry mixers or dissolved in a suitable solvent, for example methanol, acetone or methyl chloride, which is stirred on the polymer, returning to evaporating the solvent, optionally then granulating in a commercially available extrusion press. (Machine-translation by Google Translate, not legally binding)

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