中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

17 records (took 0.034 seconds)

    7.
    发明专利
    未知

    公开(公告)号：DE69313324T2

    公开(公告)日：1998-02-12

    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.

    9.
    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.

    10.
    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.

Patent Agency Ranking