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    PROCESS FOR THE PRODUCTION OF WATER-ADSORBING CELLULOSE ETHERS
    2.
    发明专利
    PROCESS FOR THE PRODUCTION OF WATER-ADSORBING CELLULOSE ETHERS 未知

    公开(公告)号：CA1062254A

    公开(公告)日：1979-09-11

    申请号：CA251760

    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 ,  B01J20/24 ,  B01J20/281 ,  C08B11/187 ,  C08B11/193 ,  C08B15/00 ,  C08B15/10 ,  G01N30/88 ,  C08B11/00

    Abstract: PROCESS FOR THE PRODUCTION OF WATER-ADSORBING CELLULOSE ETHERS This invention relates to an improvement in the process for the production of water-absorbing, 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 carboxymethtyl 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 modification agent reactlve with the still free hydroxyl groups of the cellulose anhydro glucose groups, said modification agent having one of the formulae I and II in which R1 is hydroxyl, an acylamino or esterified carbamino group, and R2 is hydrogen or a carboxyl group, the improvement comprising effecting alkalization, etherification and modification in a liquid reaction medium other than isopropyl alcohol.

    WATER ABSORBING CROSS-LINKED CELLULOSE ETHERS
    3.
    发明专利
    WATER ABSORBING CROSS-LINKED CELLULOSE ETHERS 未知

    公开(公告)号：AU498401B2

    公开(公告)日：1979-03-08

    申请号：AU1363476

    申请日：1976-05-05

    Applicant: HOECHST AG

    Inventor： HOLST ARNO ,  LASK HELMUT ,  KOSTRZEWA MICHAEL

    IPC: A61F13/472 ,  A61F13/15 ,  A61F13/53 ,  A61L15/28 ,  A61L15/60 ,  B01J20/24 ,  B01J20/281 ,  C08B11/187 ,  C08B11/193 ,  C08B15/00 ,  C08B15/10 ,  G01N30/88

    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 modification agent reactive with the still free hydroxyl groups of the cellulose anhydro glucose groups, said modification agent having one of the formulae I II in which R1 is hydroxyl, an acylamino or esterified carbamino group, and R2 is hydrogen or a carboxyl group, THE IMPROVEMENT COMPRISING EFFECTING ALKALIZATION, ETHERIFICATION, AND MODIFICATION IN A LIQUID REACTION MEDIUM OTHER THAN ISOPROPYL ALCOHOL.

    SWELLABLE, ABSORPTIVE OF POLYHYDROXY METHYLENE
    4.
    发明专利
    SWELLABLE, ABSORPTIVE OF POLYHYDROXY METHYLENE 未知

    公开(公告)号：AU498054B2

    公开(公告)日：1979-02-01

    申请号：AU1772376

    申请日：1976-09-14

    Applicant: HOECHST AG

    Inventor： HOLST ARNO ,  KOSTRZEWA MICHAEL

    IPC: C08B15/10 ,  C08F8/02 ,  C08G61/04 ,  C08F16/06 ,  C08J3/24 ,  C08F16/08 ,  C08F8/00

    Abstract: This invention relates to a process for the manufacture of absorptive polymers which are at least preponderantly insoluble in water, but capable of swelling in water, which comprises etherifying polyhydroxy methylene in a homogeneous phase in an aqueous alkaline solution with an alpha -halogen carboxylic acid, and prior to, during, or after the etherification process performing a further reaction with a cross-linking agent which is polyfunctional towards polyhydroxy methylene in an alkaline medium.

    5.
    发明专利
    未知

    公开(公告)号：FI762619A

    公开(公告)日：1977-03-16

    申请号：FI762619

    申请日：1976-09-13

    Applicant: HOECHST AG

    Inventor： HOLST ARNO ,  KOSTRZEWA MICHAEL

    IPC: C08B15/10 ,  C08F8/02 ,  C08G61/04 ,  C08G

    Abstract: This invention relates to a process for the manufacture of absorptive polymers which are at least preponderantly insoluble in water, but capable of swelling in water, which comprises etherifying polyhydroxy methylene in a homogeneous phase in an aqueous alkaline solution with an alpha -halogen carboxylic acid, and prior to, during, or after the etherification process performing a further reaction with a cross-linking agent which is polyfunctional towards polyhydroxy methylene in an alkaline medium.

    METHOD FOR COLD-MILLING CELLULOSE DERIVATIVES
    10.
    发明专利
    METHOD FOR COLD-MILLING CELLULOSE DERIVATIVES 未知

    公开(公告)号：CA1067055A

    公开(公告)日：1979-11-27

    申请号：CA221298

    申请日：1975-03-05

    Applicant: HOECHST AG

    Inventor： KOSTRZEWA MICHAEL ,  HOLST ARNO ,  BUCHBERGER GERHARD

    IPC: B02C19/18 ,  B29B13/10 ,  C08J3/12 ,  C08B11/20

    Abstract: This invention relates to an improvement in the method for the cold-milling of a cellulose derivative, in which the cellulose derivative is cooled by means of liquid nitrogen until it becomes brittle and the thus cooled cellulose derivative is milled in a mill, the improvement comprising cold-milling a cellulose derivative which is soluble or swellable in water and has a water content of between 40 and 150 per cent by weight, based on its dry weight, and which is, at 20.degree.C, able to absorb, during swelling, more than 150 per cent by weight of water, based on its dry weight.

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