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    16.
    发明专利
    未知

    公开(公告)号：DE3628560A1

    公开(公告)日：1988-03-03

    申请号：DE3628560

    申请日：1986-08-22

    Applicant: BASF AG

    Inventor： WALTER MANFRED DR ,  SCHUETTE WILHELM DR ,  GOERRISSEN HEINER DR

    IPC: C08L59/00 ,  C08K3/32 ,  C08K3/34 ,  C08K5/13 ,  C08K5/521 ,  C08K13/02 ,  C08J5/00 ,  C08J5/18

    Abstract: Polyoxymethylene molding materials having improved heat stability and consisting of (A) one or more polyoxymethylene homopolymers and/or copolymers and (B) one or more antioxidants having a sterically hindered phenolic structure, (C) with or without additives, contain (D) as an additive, one or more alkaline earth metal silicates and/or alkaline earth metal glycerophosphates, advantageously in an amount of from 0.002 to 2.0% by weight, based on the weight of component (A), for improving the heat stability, reducing the tendency to discoloration and minimizing the free formaldehyde content. To prepare the novel polyoxymethylene molding materials, the components are advantageously melted in an extruder at from 150 DEG to 260 DEG C. The polyoxymethylene molding materials are useful for the production of films or, preferably, moldings, which are used, for example, in the automotive, electrical appliances and electronics industries.

    17.
    发明专利
    未知

    公开(公告)号：CH595403A5

    公开(公告)日：1978-02-15

    申请号：CH975075

    申请日：1975-07-25

    Applicant: BASF AG

    Inventor： DOERFEL HELMUT DR ,  SCHMIDT FRANZ DR ,  SCHUETTE WILHELM DR ,  CORDES CLAUS DR ,  SCHENK WOLFGANG DR

    IPC: C08G2/00 ,  C08G2/28

    Abstract: Method of removing odorous formaldehyde from stabilized shaped polyoxymethylenes in which an inert gas is caused to flow over stabilized and shaped solid polyoxymethylenes at elevated temperatures not high enough to cause sticking or fusion of the polyoxymethylene, until substantially all of the volatile formaldehyde has been removed.

    18.
    发明专利
    未知

    公开(公告)号：DE1669727B

    公开(公告)日：1971-04-15

    申请号：DE1669727D

    申请日：1967-10-17

    Applicant: BASF AG

    Inventor： SANDER BRUNO DR ,  SCHUETTE WILHELM DR

    IPC: C08K5/20 ,  C08L59/02 ,  C08L61/20 ,  C08G37/04

    CPC classification number: C07C243/00 ,  C08K5/20 ,  C08L59/02 ,  C08L61/20

    Abstract: 1,234,057. Stabilizing oxymethylene polymers by addition of a #-aminolactamide. BADISCHE ANILIN- & SODA-FABRIK A.G. ]6 Oct., 1968 [17 Oct., 1967 (2)], No. 48967/68. Heading C3P. Compositions comprise an oxymethylene polymer and a stabilizing compound of formula where R 1 is H, OH, NR 2 R 2 , -CH 2 -CH(OH)- CONH 2 , in which m is 1 to 3 and n is 1 or 2, or m is 1 and n is 1 to 3, or in which m + n is 1 to 5 and m is 1 to 5, and R 2 is H or CH 2 .CH(OH)-CONH 2 . Phenolic antioxidants and a polycondensate of isophthalic diamide, a cyclic -N,N 1 - alkylene urea having 2 to 5 carbon atoms, and formaldehyde may also be included. In the examples, trioxan-1,3- dioxolan copolymers treated with NaF are stabilized with nitrilotrilactamide or ethylene diamine tetralactamide and a conventional bisphenol.

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