3.
    发明专利
    未知

    公开(公告)号:DE4446540A1

    公开(公告)日:1996-06-27

    申请号:DE4446540

    申请日:1994-12-24

    Applicant: HOECHST AG

    Abstract: Process for preparing water-soluble polysaccharides contg. (a) substituents chosen from alkyl, hydroxyalkyl, carboxyalkyl and sulphoalkyl and (b) N,N-disubstd. aminoalkyl gps., comprises alkylating a polysaccharide in the presence of a base with a mixt. of one or more alkylating agents (I) chosen from alkyl gp.-transferring cpds. (Ia), hydroxyalkyl gp.-transferring cpds. (Ib), carboxyalkyl gp.-transferring cpds. (Ic) and sulphoalkyl gp.-transferring cpds. (Id), and an N,N-disubstituted aminoalkyl sulphuric acid ester (II).

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