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    21.
    发明专利
    未知

    公开(公告)号：BR7409779A

    公开(公告)日：1976-05-25

    申请号：BR977974

    申请日：1974-11-21

    Applicant: HOECHST AG

    Inventor： HOLST A ,  LASK H

    IPC: C08B11/187 ,  A61L15/28 ,  C08B11/14 ,  C08B11/193 ,  C08B15/10 ,  C08B11/08 ,  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 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 a modification agent which is able to react with the still free hydroxyl groups of the cellulose anhydro glucose groups in an alkaline reaction medium is reacted before, during, or after the etherification, the improvement comprising effecting the etherification of cellulose to carboxymethyl cellulose, carboxymethyl hydroxyethyl cellulose, hydroxyethyl cellulose, or methylhydroxyethyl cellulose, reacting with the modification agent in the presence of 0.8 to 7.5 parts by weight of isopropanol, based upon the cellulose weight, and employing a modification agent being one of the formulae HOHH H ¦ PARALLEL ¦¦ ¦ (I) H2C=C-C-N-C-R1 and (II) H2C=C-SO2-NH2, ¦ R2 R1 in formula I being hydroxyl, or an acylamino or etherified carbamino group, and R2 in formula I being hydrogen or a carboxyl group.

    22.
    发明专利
    未知

    公开(公告)号：BR7409528A

    公开(公告)日：1976-05-25

    申请号：BR952874

    申请日：1974-11-13

    Applicant: HOECHST AG

    Inventor： LASK H ,  HOLST A ,  KOSTRZEWA M

    IPC: C08B11/187 ,  A61L15/28 ,  C08B11/00 ,  C08B15/10 ,  C08B11/08 ,  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 . ¦

    24.
    发明专利
    未知

    公开(公告)号：FI329274A

    公开(公告)日：1975-05-16

    申请号：FI329274

    申请日：1974-11-13

    Applicant: HOECHST AG

    Inventor： HOLST A ,  KOSTRZAWA M ,  LASK H

    IPC: C08B11/187 ,  A61L15/28 ,  C08B11/00 ,  C08B15/10 ,  C08B

    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 . ¦

    27.
    发明专利
    未知

    公开(公告)号：DK107478A

    公开(公告)日：1978-09-13

    申请号：DK107478

    申请日：1978-03-10

    Applicant: HOECHST AG

    Inventor： HOLST A ,  LASK H ,  NISCHITZ E ,  FISCHER W

    IPC: D04H1/42 ,  D04H1/425 ,  D04H1/4258 ,  D04H1/435 ,  D04H1/46 ,  D04H1/488 ,  D04H1/587 ,  D04H1/64 ,  D04H

    Abstract: This invention relates to a bonded fiber web capable of absorbing water vapor and composed of synthetic, natural or regenerated fibers with a uniformly incorporated additive of at least one polymer, said additive comprising fibrous particles of at least one swellable carbohydrate derivative or a swellable modified carbohydrate derivative. The invention also relates to a process for the manufacture of the bonded fiber web.

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