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    2.
    发明专利
    未知

    公开(公告)号：DE3879362D1

    公开(公告)日：1993-04-22

    申请号：DE3879362

    申请日：1988-10-14

    Applicant: HOECHST AG

    Inventor： LASK HELMUT ,  HOLST ARNO DR ,  DRYCZYNSKI KURT

    IPC: G01N21/47 ,  A61F13/00 ,  G01N21/35 ,  G01N21/41 ,  G01N21/43 ,  G01N21/84

    Abstract: The dove prism (1) allows a parallel light beam from a light source (2) adjacent one of its side edges (3) to be reflected onto a light trap (4) adjacent the opposite side edge (5). A photodetector (10) is located in the angle between the edges (3, 5) in a plane parallel to the hypotencuse surface of the prism (1) for receiving the light diffracted by the measured surface. Alternatively, the prism is replaced by a rectangular block with a right angle prism attached to its two opposing sides.

    4.
    发明专利
    未知

    公开(公告)号：FI58334C

    公开(公告)日：1981-01-12

    申请号：FI329274

    申请日：1974-11-13

    Applicant: HOECHST AG

    Inventor： HOLST ARNO ,  KOSTRZEWA MICHAEL ,  LASK HELMUT

    IPC: C08B11/187 ,  A61L15/28 ,  C08B11/00 ,  C08B15/10 ,  C08B11/12

    Abstract: This invention relates to an improvement in the process for the production of water-adsorbing, but largely water-insoluble, cellulose ethers, in which cellulose is alkalized in the presence of alkali hydroxide and isopropanol as a reaction medium and is so reacted with an etherification agent that by etherification only a water-soluble cellulose ether is produced, and in which process the cellulose is reacted with a cross-linking agent which is polyfunctional towards cellulose in an alkaline reaction medium before, during, or after the etherification of the cellulose, the improvement comprising effecting the etherification of cellulose to carboxymethyl cellulose, carboxymethyl hydroxyethyl cellulose, hydroxyethyl cellulose, or methylhydroxyethyl cellulose, reacting the cellulose with the polyfunctional cross-linking agent in the presence of 0.8 to 7.5 parts by weight of isopropanol, based upon the cellulose weight, and employing as the cross-linking agent acrylamido methylene chloroacetamide, dichloroacetic acid or phosphorus oxychloride or a compound in which at least two groups functional towards cellulose are THE ACRYLIC AMINO GROUP CH2=CH-C-N- PARALLEL ¦ O the chlorine azomethine group -N=C- ¦ Cl OR THE ALLYLOXY AZOMETHINE GROUP -N=C-O-CH2-CH=CH2 . ¦

    5.
    发明专利
    未知

    公开(公告)号：FI58334B

    公开(公告)日：1980-09-30

    申请号：FI329274

    申请日：1974-11-13

    Applicant: HOECHST AG

    Inventor： HOLST ARNO ,  KOSTRZEWA MICHAEL ,  LASK HELMUT

    IPC: C08B11/187 ,  A61L15/28 ,  C08B11/00 ,  C08B15/10 ,  C08B11/12

    Abstract: This invention relates to an improvement in the process for the production of water-adsorbing, but largely water-insoluble, cellulose ethers, in which cellulose is alkalized in the presence of alkali hydroxide and isopropanol as a reaction medium and is so reacted with an etherification agent that by etherification only a water-soluble cellulose ether is produced, and in which process the cellulose is reacted with a cross-linking agent which is polyfunctional towards cellulose in an alkaline reaction medium before, during, or after the etherification of the cellulose, the improvement comprising effecting the etherification of cellulose to carboxymethyl cellulose, carboxymethyl hydroxyethyl cellulose, hydroxyethyl cellulose, or methylhydroxyethyl cellulose, reacting the cellulose with the polyfunctional cross-linking agent in the presence of 0.8 to 7.5 parts by weight of isopropanol, based upon the cellulose weight, and employing as the cross-linking agent acrylamido methylene chloroacetamide, dichloroacetic acid or phosphorus oxychloride or a compound in which at least two groups functional towards cellulose are THE ACRYLIC AMINO GROUP CH2=CH-C-N- PARALLEL ¦ O the chlorine azomethine group -N=C- ¦ Cl OR THE ALLYLOXY AZOMETHINE GROUP -N=C-O-CH2-CH=CH2 . ¦

    7.
    发明专利
    未知

    公开(公告)号：CH618448A5

    公开(公告)日：1980-07-31

    申请号：CH558676

    申请日：1976-05-04

    Applicant: HOECHST AG

    Inventor： HOLST ARNO ,  LASK HELMUT ,  KOSTRZEWA MICHAEL

    IPC: A61F13/472 ,  A61F13/15 ,  A61F13/53 ,  A61L15/28 ,  A61L15/60 ,  C08B11/187 ,  C08B15/00 ,  C08B15/10 ,  C08B11/00 ,  C08B13/00

    Abstract: This invention relates to an improvement in the process for the production of water-adsorbing, but at least partially water-insoluble, cellulose ethers in which cellulose is alkalized in a liquid reaction medium and etherified in a manner such that by etherification only an at least largely water-soluble carboxymethyl cellulose, carboxymethyl hydroxyethyl cellulose, hydroxyethyl cellulose or methyl hydroxyethyl cellulose is produced, and in which the cellulose is reacted in an alkaline reaction medium before, during, or after the etherification with a cross-linking agent which is polyfunctional towards cellulose and selected from the group consisting of acrylamido methylene chloroacetamide, dichloroacetic acid, phosphorous oxychloride, or a compound in which at least two groups functional towards cellulose are the acrylamido group the chloroazomethine group the allyloxy azomethine group the improvement comprising effecting alkalization, etherification, and cross-linking in a liquid reaction medium other than isopropyl alcohol.

    8.
    发明专利
    未知

    公开(公告)号：DE2823757A1

    公开(公告)日：1979-12-13

    申请号：DE2823757

    申请日：1978-05-31

    Applicant: HOECHST AG

    Inventor： LASK HELMUT ,  HOLST ARNO DR

    IPC: A61L15/28 ,  C08B11/12 ,  C08B15/00 ,  C08B17/06 ,  C08B15/10 ,  D04H1/42

    Abstract: This invention relates to a process for preparing swellable cross-linked carboxyalkylcelluloses in the form of fibers, by reacting cellulose, a carboxyalkylating etherifying agent, and a cross-linking agent in an aqueous alkaline medium, comprising effecting alkalizing, etherifying, and cross-linking simultaneously in one reaction step using fibers of cellulose hydrate or fiber-based textile sheet materials which contain these fibers, by contacting said fibers or textile sheet materials which contain these fibers with an ample quantity of an aqueous alkaline reaction mixture, removing part of the reaction mixture from the fibers or the textile sheet materials contacted therewith, so that at least the quantity required for reaction is still present, and treating the fibers or the textile sheet materials containing the remainder of the aqueous alkaline reaction mixture with heat energy.

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