Retention aids for papermaking
US5717046A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 19, 1996 |
| Grant date | Feb 10, 1998 |
| Priority date | — |
| Expiry date | Jan 19, 2016 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21H21/10
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
The present invention relates to retention aids for papermaking, in particular which comprise cationic multiarmed star-like polymers of formula (I): EQU (D).sub.y --(A).brket open-st.B--(CH.sub.2).sub.n --(E).sub.p --(F).sub.q .brket close-st..sub.x (I) 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 ##STR1## B is --O-- or --COO--; D is --OH; E is ##STR2## F is ##STR3## wherein, R.sup.1 --R.sup.11 are independently hydrogen or alkyl; R.sub.a --R.sub.d are independently hydrogen or alkyl; X.sup.- is ##STR4## 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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.