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    2.
    发明专利
    未知

    公开(公告)号：ES2106278T3

    公开(公告)日：1997-11-01

    申请号：ES93301696

    申请日：1993-03-05

    Applicant: POLYPLASTICS CO ,  HOECHST AG

    Inventor： YAMAMOTO KAORU ,  MAEDA NAGAYOSHI ,  KAMIYA MAKOTO ,  MURAO TOSHIRO ,  REUSCHEL GERHARD ,  FLEISCHER DIETRICH

    IPC: C08G2/10 ,  C08G2/28

    Abstract: A process for producing a polyoxymethylene copolymer having improved thermal stability and/or a high degree of polymerisation comprises copolymerising trioxane as a main monomer with a cyclic ether or a cyclic formal as a comonomer in the presence of 1 x 10 % to 1 x 10 % by mole (based on the total amount of the monomers) of a catalyst comprising boron trifluoride or a coordination compound thereof, wherein unwanted decomposition and side reactions are controlled by keeping to below 1 x 10 % by mole (based on the total amount of the monomers) the total content of impurities such as would give short product chains and/or unstable terminal groups in the copolymer, and cooling the obtained product to a temperature of 45 DEG C or below within 30 seconds after the completion of the copolymerisation to deactivate the catalyst.

    3.
    发明专利
    未知

    公开(公告)号：DK0559496T3

    公开(公告)日：1997-10-27

    申请号：DK93301696

    申请日：1993-03-05

    Applicant: POLYPLASTICS CO ,  HOECHST AG

    Inventor： MURAO TOSHIRO ,  YAMAMOTO KAORU ,  MAEDA NAGAYOSHI ,  KAMIYA MAKOTO ,  REUSCHEL GERHARD ,  FLEISCHER DIETRICH

    IPC: C08G2/10 ,  C08G2/28

    Abstract: A process for producing a polyoxymethylene copolymer having improved thermal stability and/or a high degree of polymerisation comprises copolymerising trioxane as a main monomer with a cyclic ether or a cyclic formal as a comonomer in the presence of 1 x 10 % to 1 x 10 % by mole (based on the total amount of the monomers) of a catalyst comprising boron trifluoride or a coordination compound thereof, wherein unwanted decomposition and side reactions are controlled by keeping to below 1 x 10 % by mole (based on the total amount of the monomers) the total content of impurities such as would give short product chains and/or unstable terminal groups in the copolymer, and cooling the obtained product to a temperature of 45 DEG C or below within 30 seconds after the completion of the copolymerisation to deactivate the catalyst.

    4.
    发明专利
    未知

    公开(公告)号：DE69313324D1

    公开(公告)日：1997-10-02

    申请号：DE69313324

    申请日：1993-03-05

    Applicant: POLYPLASTICS CO ,  HOECHST AG

    Inventor： YAMAMOTO KAORU ,  MAEDA NAGAYOSHI ,  KAMIYA MAKOTO ,  MURAO TOSHIRO ,  REUSCHEL GERHARD ,  FLEISCHER DIETRICH

    IPC: C08G2/10 ,  C08G2/28

    Abstract: A process for producing a polyoxymethylene copolymer having improved thermal stability and/or a high degree of polymerisation comprises copolymerising trioxane as a main monomer with a cyclic ether or a cyclic formal as a comonomer in the presence of 1 x 10 % to 1 x 10 % by mole (based on the total amount of the monomers) of a catalyst comprising boron trifluoride or a coordination compound thereof, wherein unwanted decomposition and side reactions are controlled by keeping to below 1 x 10 % by mole (based on the total amount of the monomers) the total content of impurities such as would give short product chains and/or unstable terminal groups in the copolymer, and cooling the obtained product to a temperature of 45 DEG C or below within 30 seconds after the completion of the copolymerisation to deactivate the catalyst.

    5.
    发明专利
    未知

    公开(公告)号：AT157374T

    公开(公告)日：1997-09-15

    申请号：AT93301696

    申请日：1993-03-05

    Applicant: POLYPLASTICS CO ,  HOECHST AG

    Inventor： YAMAMOTO KAORU ,  MAEDA NAGAYOSHI ,  KAMIYA MAKOTO ,  MURAO TOSHIRO ,  REUSCHEL GERHARD ,  FLEISCHER DIETRICH

    IPC: C08G2/10 ,  C08G2/28

    Abstract: A process for producing a polyoxymethylene copolymer having improved thermal stability and/or a high degree of polymerisation comprises copolymerising trioxane as a main monomer with a cyclic ether or a cyclic formal as a comonomer in the presence of 1 x 10 % to 1 x 10 % by mole (based on the total amount of the monomers) of a catalyst comprising boron trifluoride or a coordination compound thereof, wherein unwanted decomposition and side reactions are controlled by keeping to below 1 x 10 % by mole (based on the total amount of the monomers) the total content of impurities such as would give short product chains and/or unstable terminal groups in the copolymer, and cooling the obtained product to a temperature of 45 DEG C or below within 30 seconds after the completion of the copolymerisation to deactivate the catalyst.

    6.
    发明专利
    未知

    公开(公告)号：DK0696222T3

    公开(公告)日：1997-06-02

    申请号：DK94913593

    申请日：1994-04-13

    Applicant: HOECHST AG

    Inventor： KULPE J ,  STRUTZ HEINZ ,  FLEISCHER DIETRICH ,  SCHLEICHER ANDREAS DR

    IPC: B01D15/00 ,  B01D19/00 ,  B01D53/14 ,  B01D53/34 ,  B01D53/66 ,  B01D53/86 ,  B01J20/26 ,  C08G75/02

    Abstract: A filter material based on a polyarylene thioether having repeating units of the formula -[(Ar1)n-X)]m-[(Ar2)i-Y)]j-[(Ar3)k-Z)]l-[(Ar4)o-W)]p-(I) in which Ar1, Ar2, Ar3, Ar4, W, X, Y and Z, independently of each other, are identical or different, the indices n, m, i, j, k, l, o and p, independently of each other, are zero or integers 1, 2, 3 or 4, their sum being at least 2, Ar1, Ar2, Ar3 and Ar4 are arylene systems having 6 to 18 carbon atoms, and W, X, Y and Z are divalent linking groups, selected from -SO2-, -S-, -SO-, -CO-, -O-, -CO2-, or alkylene groups or alkylidene groups having 1 to 6 carbon atoms is suitable for removing ozone from gases or liquids. The removal proceeds quantitatively, no volatile products being formed.

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