POLIMERO CATIONICO E PROCESSO PARA SUA PREPARACAO,COMPOSICAO ADAPTADA PARA SER USADA NA PRODUCAO DE PAPEL E PROCESSO PARA PRODUCAO DE PAPEL

A cationic polymer useful as an additive in paper-making processes comprises at least one moiety of the formula I wherein R is selected from hydrogen and R ; R is selected from hydrogen and C -C alkyl; the groups R and R psi are independently selected from C -C1/4 alkyl, cycloalkyl, C -C1/4 alkenyl, aryl and aralkyl, these being optionally substituted with at least one group which is selected from C -C1/4 hydroxyalkyl, C -C1/4 aminoalkyl, C -C1/4 sulphoalkyl and C -C1/4 carboxyalkyl, carboxy, and sulpho groups, where present, being in either acid or salt form, or the groups R 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 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 -, with the proviso that a maximum of one of R3/4 , R¦, R shall contain a moiety -NR -, R being selected from hydrogen, methyl, ethyl and a group of the formula wherein R , R and, where present, R are independently selected from hydrogen, methyl and ethyl, or R and R 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 -C1/4 alkylene, C -C1/4 hydroxyalkylene and C -C1/4 alkylene interrupted by -0-; and n is an integer of from 0 to 20.