中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

75 records (took 0.021 seconds)

    51.
    发明专利
    未知

    公开(公告)号：SE312441B

    公开(公告)日：1969-07-14

    申请号：SE1146862

    申请日：1962-10-25

    Applicant: HOECHST AG

    Inventor： GUTWEILER K ,  FISCHER E ,  KUELLMAR K ,  BIER G

    IPC: C08G2/00 ,  C08G2/38 ,  C08G4/00 ,  C08G1/16

    Abstract: A trioxane graft polymer is prepared by polymerizing trioxane in the presence of a Lewis acid and at least one primary polymer selected from the group consisting of polyethers, polyether acetals and polyacetals. The polymerization may be effected by adding the trioxane to a mixture of a polymer and Lewis acid, or by adding the acid to a mixture of trioxane and polymer or by mixing the trioxane and polymer, cooling this mixture to below its melting-point contacting with boron trifluoride gas and polymerizing at above the melting-point of trioxane. The Lewis acid may be BF3, BCl3, AlCl3, FeCl3, SbCl3, SbCl5, ZnCl2, SnCl4, TiCl4, the reaction product of borontrifluoride with dimethyl ether, methylethylether, diethyl-ether, di-isoamyl ether, tetrahydrofuran or tetrahydropyrene, an oxon-ium salt of boron trifluoride, a substituted diazonium salt containing the BF4-, ClO4- or PF6-anion which is either light active or thermoactive. Many catalysts are listed. Specifications 886,982 and 919,499 are referred to.

    PLASTIC MATERIAL STABILIZED AGAINST ULTRAVIOLET RADIATION
    57.
    发明专利
    PLASTIC MATERIAL STABILIZED AGAINST ULTRAVIOLET RADIATION 未知

    公开(公告)号：ZA743807B

    公开(公告)日：1975-07-30

    申请号：ZA743807

    申请日：1974-06-14

    Applicant: HOECHST AG

    Inventor： FISCHER E ,  LUEDERS W

    IPC: C08K5/00 ,  C08K5/52 ,  C08K5/527 ,  C08L7/00 ,  C08L21/00 ,  C08L23/00 ,  C08L101/00 ,  C08K

    Abstract: Synthetic materials are stabilised against ultra-violet light by addn. of a cyclic diphosphite of formula: where X is a 2-6C alkylene, opt. substd. by halogen, alkoxy or carbalkoxy, or a phenylene opt. substd. by >=1 halogen atoms, 1-5C alkyl or carbalkoxy, and Y is alkylene a 2-12C alkylene ether a phenylene opt. substd. by >=1 halogen atoms, 1-5C alkyl or carbalkoxy, or an alkylene-arylene in which the arylene gp. has 6C or 12C and the alkylene is 1-3C. (I) have better stabilising properties than known ultra-violet absorbents contg. OH gps. The synthetics are esp. (co)polymers of ethylene, propylene, butene and 4-methyl-1-pentene, or polystyrene.

    58.
    发明专利
    未知

    公开(公告)号：BR7404850D0

    公开(公告)日：1975-01-21

    申请号：BR485074

    申请日：1974-06-12

    Applicant: HOECHST AG

    Inventor： SCHIESSLER S ,  PLESSEN H ,  FISCHER E

    IPC: C01B17/88 ,  C01B17/90

    Abstract: Contaminated sulfuric acid which may contain water, organic compounds and inorganic salts is converted to almost pure concentrated sulfuric acid by passing the acid through a Pauling plant and distilling the concentrated contaminated acid.

Patent Agency Ranking