Patent number: 11447682
Abstract: This invention relates to water-soluble or water-swellable polymers, containing a) 25-35 mol. % of one or more recurrent structural units of formula (1), where R1 and R2 represent hydrogen, methyl or ethyl, A represents a linear or branched C1-C12-alkylene, and Q+ stands for NH4+, Li+, Na+, K+, ½ Ca++, ½ Mg++, ½ Zn++, ? Al+++, or organic ammonium ions of the formula [HNR5R6R7]+, b) 3 to 8 mol. % of one or more recurrent structural units of formula (2), where R1 represents hydrogen, methyl, or ethyl, X+ stands for H+, NH4+, Li+, Na+, K+, ½ Ca++, ½ Mg++, ½ Zn++, ? Al+++, or organic ammonium ions of the formula [HNR5R6R7]+, B is a linear or branched alkylene group with 1 to 6 carbon atoms, and n is a whole number between 0 and 5, and c) 57 to 72 mol. % of a (meth)acrylamide.
Type:
Grant
Filed:
May 13, 2020
Date of Patent:
September 20, 2022
Assignee:
CLARIANT INTERNATIONAL LTD
Inventors:
Dirk Fischer, Christoph Kayser, Claudia Diemel, Jürgen Tonhauser, Michael Schäfer