Hydrolysis resistant vinyl lactam amino acrylamide polymers
US4923694A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 25, 1988 |
| Grant date | May 8, 1990 |
| Priority date | — |
| Expiry date | Aug 25, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S424/02
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
The invention relates to a hydrolysis resistant, high molecular weight polymer represented by the formula ##STR1## wherein R is alkylene having from 3 to 8 carbon atoms which is optionally substituted with lower alkyl; R.sub.1 and R.sub.2 are each hydrogen or methyl; wherein R.sub.7 and R.sub.8 are each alkylene having from 1 to 18 carbon atoms and are optionally substituted with alkyl; the sum of r and t is one or two; R.sub.4 and R.sub.5 are each independently lower alkyl; R.sub.6 is alkyl, aralkyl or alkaryl having from 1 to 8 carbon atoms or N-alkylene lactam having from 3 to 8 carbon atoms; X.sup.- is an anion derived from the group of halogen, SO.sub.3, SO.sub.4, HSO.sub.4 and R.sub.6 SO.sub.4 ; M is a copolymerizable vinyl monomer; n has a value of from 10 to 99 mole %; m has a value of from 1 to 90 mole %; p has a value of from 0 to 20 mole % and the sum of m+n+p is 100; q and q' have the same value which is 0 or 1; s is the reciprocal of the number of negative charges in X; and the total amount of monomer represented by subscript m can be from 1% to 100% quaternized. The invention also relates to a process for the preparation of the polymer containing low residual monomer …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.