| 摘要 |
A cationic polymer useful as an additive in paper-making processes comprises at least one moiety of the formula I <CHEM> wherein R<6> is selected from hydrogen and R<8>; R<7> is selected from hydrogen and C<5>-C<7> alkyl; the groups R<8> and R psi are independently selected from C<5>-C1/4 alkyl, cycloalkyl, C<6>-C1/4 alkenyl, aryl and aralkyl, these being optionally substituted with at least one group which is selected from C<5>-C1/4 hydroxyalkyl, C<5>-C1/4 aminoalkyl, C<5>-C1/4 sulphoalkyl and C<5>-C1/4 carboxyalkyl, carboxy, and sulpho groups, where present, being in either acid or salt form, or the groups R<8> and R psi together with the nitrogen atom to which they are attached form a heterocyclic ring which may optionally comprise other heterocyclic atoms; R1/4 , R3/4 , R¦ and, where present, R1/2 and R<5><4> are independently selected from hydrogen, a hydrocarbon radical having from 1 to 8 carbon atoms and being bonded to the nitrogen atom through an aliphatic carbon atom on this radical, a radical having a sequence of from 4 to 8 carbon atoms which sequence is interrupted by -O- or -NR<5><5>-, with the proviso that a maximum of one of R3/4 , R¦, R<5><4> shall contain a moiety -NR<5><5>-, R<5><5> being selected from hydrogen, methyl, ethyl and a group of the formula <CHEM> wherein R<5><6>, R<5><7> and, where present, R<5><8> are independently selected from hydrogen, methyl and ethyl, or R<5><6> and R<5><7> together with the nitrogen atom to which they are attached form an aliphatic heterocycle with from 4 to 5 carbon atoms, and m is an integer from 1-3; X is selected from C<7>-C1/4 alkylene, C<5>-C1/4 hydroxyalkylene and C<8>-C1/4 alkylene interrupted by -0-; and n is an integer of from 0 to 20.
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