Water-soluble or water-swellable polymers as water loss reducers in cement slurries

US11447682B2 · kind B2 · utility

Assignee

• CLARIANT INTERNATIONAL LTD · CH

Inventors

• Dirk Fischer · Garching an der Alz, DE
• Christoph Kayser · Mainz, DE
• Claudia Diemel · Gelnhausen, DE
• Jürgen TONHAUSER · Oestrich-Winkel, DE
• Michael Gayle Schafer · Alexandria, US

Key dates

• Filing date: May 13, 2020
• Grant date: Sep 20, 2022
• Expiry date: May 13, 2040

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F2800/10
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

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++, ⅓ 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++, ⅓ 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.