Process for the manufacture of water-absorbing cellulose ethers
AssigneeHoechst Aktiengesellschaft
InventorsArno Holst, Helmut Lask, Michael Kostrzewa
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Abstract
This invention relates to an improvement in the process for the manufacture of water-adsorbing but at least partially water-insoluble cellulose ethers in which cellulose is alkalized in a liquid reaction medium and reacted with an etherification agent in a manner such that an at least preponderantly water-soluble cellulose ether would be obtained in the case of a mere etherification process and in which, prior to, simultaneously with, or after the etherification process, a reaction is effected with a crosslinking agent which is polyfunctional towards cellulose in an alkaline reaction medium, The improvement comprising employing bis(acrylamido)-acetic acid as the crosslinking agent.
Claims4
In the process for the manufacture of water-adsorbing but at least partially water-insoluble cellulose ethers in which cellulose is alkalized in a liquid reaction medium and reacted with an etherification agent in a manner such that an at least preponderantly water-soluble celluose ether would be obtained in the case of a mere etherification process and in which, prior to, simultaneously with, or after the etherification prodcess, a reaction is effected with a crosslinking agent which is polyfunctional towards cellulose in an alkaline reaction medium,
- the improvement which comprises employing bis(acrylamido)-acetic acid as the crosslinking agent.
Dependencies are inferred from the claim text.