| abstract |
Disclosed is a cellulose ether having at least one phosphorus-containing substituent or a mixed ether of said cellulose ether having in addition at least one phosphorus-free substituent comprising alkyl, hydroxyalkyl, carboxyalkyl, sulfonoalkyl, aminoalkyl, or diaminoalkyl, wherein the phosphorus-containing substituent(s) comprise(s) groups of the formula ##STR1## wherein R 1 and R 2 are OX; or R 1 is OX and R 2 is OY; or R 1 is OX and R 2 is (CH 2 ) n --CH 3 ; or R 1 and R 2 are (CH 2 ) n --CH 3 ; or R 1 is (CH 2 ) n --CH 3 and R 2 is (CH 2 ) p --CH 3 , wherein n X,Y are identical or different and comprise a hydrogen atom or a monovalent cation; n m is an integer from 1 to 4; and n n,p are identical or different and are 0 or 1; with the proviso that when m is 1 or 2, R 1 and R 2 may not be OX and R 1 and R 2 may not be OX and OY, respectively. Also disclosed is a process for producing these cellulose ether products. |