Control of the thickening of silicate-containing aqueous...

Details Control of the thickening of silicate-containing aqueous... Control of the thickening of silicate-containing aqueous...

2011-08-23

2011-08-23

Halpern, Mark (Department: 1741)

Liquid purification or separation

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Material

C210S500210, C210S500420, C162S168100

Reexamination Certificate

active

08002119

ABSTRACT:
A method for controlling the thickening of aqueous systems comprising silicates, which comprises adding to the aqueous system at least one copolymer of a mean molecular weight Mw of at least 3000 g/mol to at most 60 000 g/mol and the copolymer being made up essentially randomly from monoethylenically unsaturated monocarboxylic acids, monoethylenically unsaturated dicarboxylic acids and other ethylenically unsaturated comonomers, the polymerization for producing the copolymer being performed in the presence of from 0.01 to 100 mol % of at least one base, based on the total amount of all COOH groups of the monocarboxylic and dicarboxylic acids, the quantitative figures in % by weight being respectively based on the total amount of all monomers used.

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