公开(公告)号：SE406595B

公开(公告)日：1979-02-19

申请号：SE7502297

申请日：1975-02-28

Applicant: HOECHST AG

Inventor： KOSTRZEWA M ,  HOLST A ,  BUCHBERGER G

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

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 percent by weight, based on its dry weight, and which is, at 20 DEG C, able to absorb, during swelling, more than 150 percent by weight of water, based on its dry weight.

公开(公告)号：DK566676A

公开(公告)日：1977-06-18

申请号：DK566676

申请日：1976-12-16

Applicant: HOECHST AG

Inventor： HOLST A ,  KOSTRZEWA M

IPC: C08B11/08 ,  C08B15/00 ,  C08B

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.

公开(公告)号：ZA7602704B

公开(公告)日：1977-04-27

申请号：ZA7602704

申请日：1976-05-05

Applicant: HOECHST AG

Inventor： HOLST A ,  ALSK H ,  KOSTRZEWA M

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 ,  C08B

CPC classification number: C08B15/10 ,  A61L15/28 ,  C08B11/193 ,  C08B15/005 ,  C08L1/26

公开(公告)号：NO763135A

公开(公告)日：1977-03-16

申请号：NO763135

申请日：1976-09-13

Applicant: HOECHST AG

Inventor： HOLST A ,  KOSTRZEWA M

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

CPC classification number: C08G61/04 ,  C08F8/02 ,  C08F18/24

公开(公告)号：SE7610018L

公开(公告)日：1977-03-13

申请号：SE7610018

申请日：1976-09-10

Applicant: HOECHST AG

Inventor： KOSTRZEWA M ,  MUCK K-F

IPC: B01J41/16 ,  B01J39/20 ,  C08B11/02 ,  C08F8/02 ,  C08G61/04 ,  C08F8/00

公开(公告)号：DK203376A

公开(公告)日：1976-11-08

申请号：DK203376

申请日：1976-05-06

Applicant: HOECHST AG

Inventor： HOLST A ,  LASK H ,  KOSTRZEWA M

IPC: A61F13/472 ,  A61F13/15 ,  A61F13/53 ,  A61L15/28 ,  A61L15/60 ,  C08B11/187 ,  C08B15/00 ,  C08B15/10 ,  C08B

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.

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 . ¦

公开(公告)号：DK129875A

公开(公告)日：1975-09-29

申请号：DK129875

申请日：1975-03-26

Applicant: HOECHST AG

Inventor： HOLST A ,  KOSTRZEWA M ,  LASK H

IPC: A24D3/10 ,  A24D

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.

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.