| abstract |
The present invention relates to retention aids for papermaking, in particular which comprise cationic multiarmed star-like polymers (hereinafter, it is referred to as CMS-PAM of formula (I): (D)y-(A)-[-B-(CH2)n-(E)p-(F)q-]x- as an effective component to improve the retention of fines fraction by structural characteristics of multiarmed polymer chains connected with one starting point on the compound. In formula (I), A is C(CH2)4-, -(CH2)3CCH2OCH2C(CH2)3-, -(CH2)3CCH2OCH2C(CH2)2CH2OCH2C(CH2)3; N(CH2)3-, Si(CH2)4-, (a), (b), (c) or (d); B is -O-, -COO- or -NH-CO-; D is -OH or -NH2; E is (e), (f) or -CH2-CR?12R13-NR14¿-; and F is (g); and wherein, R?1∩R14¿ is respectively hydrogen atom or alkyl group; R¿a?∩Rd is respectively hydrogen atom or alkyl group; X?-¿ is (h) or C1-; x is an integer selected from 3 to 24; y is an integer selected from 0 to 21; n is an integer selected from 3 to 6; p is an integer selected from 300 to 4000; and q is an integer selected from 0 to 1000. |