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    2.
    发明专利
    未知

    公开(公告)号：SE418750B

    公开(公告)日：1981-06-22

    申请号：SE7709478

    申请日：1977-08-23

    Applicant: HOECHST AG

    Inventor： HOLST A ,  KOSTRZEWA M ,  LASK H

    IPC: C08L101/00 ,  A61L15/28 ,  B01J47/12 ,  C08J5/22 ,  C08J7/04 ,  C08J9/28 ,  C08L1/00 ,  C08L1/06 ,  C08L1/08 ,  C08L1/26 ,  C08L67/00 ,  C08L77/00 ,  D01F1/10 ,  D01F2/28 ,  D06M15/09 ,  C08J5/00

    Abstract: 1492040 Articles comprising cellulosic particles HOECHST AG 20 Dec 1974 [24 Dec 1973] 55196/74 Heading C3F [Also in Division B5] Cellulose ethers, inherently water-soluble but rendered at least partly water-insoluble, but still water-absorbent by cross-linking or other chemical modification, are uniformly distributed in, or over a surface of, a shaped article composed of a film- or fibre-forming polymer which is insoluble in water. The cellulose ether may be carboxymethyl-, hydroxyethyl-, or methylhydroxyethyl-cellulose and is preferably in the form of particles of a size within the range of from 0À01 to 2 mm. Several modifying agents are used, epichlorohydrin most commonly. The shaped articles in the examples are films of hydrated cellulose (from viscose), cellulose acetate and hydroxyethyl cellulose and fibres of polyethylene.

    3.
    发明专利
    未知

    公开(公告)号：BR8002569A

    公开(公告)日：1980-12-09

    申请号：BR8002569

    申请日：1980-04-25

    Applicant: HOECHST AG

    Inventor： HOLST A ,  PERPLIES E

    IPC: C08B11/02 ,  C08B11/20 ,  C08B1/06 ,  C08B11/00

    Abstract: This invention relates to a process for reducing the viscosity of cellulose ethers by reacting a water-soluble cellulose ether with ozone in the presence of water, wherein said cellulose ether which is moist with water and has a dry content of from 20 to 95% by weight is reacted with an ozone/oxygen mixture or with an ozone/air mixture at a temperature of about 0 DEG to 60 DEG C.

    6.
    发明专利
    未知

    公开(公告)号：BR7608384A

    公开(公告)日：1977-12-06

    申请号：BR7608384

    申请日：1976-12-14

    Applicant: HOECHST AG

    Inventor： HOLST A ,  KOSTRZEWA M

    IPC: C08B11/08 ,  C08B15/00 ,  C08B13/00

    Abstract: Disclosed is a process for the chemical modification of a water-soluble cellulose ether, which comprises reacting the ether with a chloroformic acid ester in an aqueous organic medium containing alkali hydroxide, whereby the cellulose ether is rendered at least partially insoluble in water. The modified cellulose ether may be easily dispersed in water and redissolved to form a smooth solution of the original water-soluble ether by adding sufficient alkali to the dispersion to reuse its pH to at least about 11, preferably to about 12.

    9.
    发明专利
    未知

    公开(公告)号：SE7610128L

    公开(公告)日：1977-03-16

    申请号：SE7610128

    申请日：1976-09-13

    Applicant: HOECHST AG

    Inventor： HOLST A ,  KOSTRZEWA M

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

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