Method for producing polymers containing carbamate units and the use thereof
AssigneeBASF SE
InventorsJens Utecht, Manfred Niessner, Sabine Weiguny, Primoz Lorencak, Armin Stamm
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Abstract
A process for preparing addition polymers which contain carbamate units comprises reacting polyethyleneimines or addition polymers which contain vinylamine units of the formula where R1 is hydrogen or C1-C6-alkyl, with haloformic esters, the carbamate-functionalized polyethyleneimine or vinylamine polymers thus obtainable being useful as retention, drainage and flocculation aids and as fixatives in papermaking, as protective colloids for the preparation of aqueous alkyldiketene dispersions and as dispersants for the preparation of aqueous filler slurries.
Claims12
A process for preparing addition polymers which contain carbamate units, which comprises reacting polyethyleneimines or addition polymers which contain vinylamine units of the formula
- where R1 is hydrogen or C1-C6-alkyl, with haloformic esters.
A method for forming a protective colloid for the preparation of an aqueous dispersion of C14-C22-alkylketene dimers comprising adding to said dispersion an addition polymer obtained by reacting a polyethyleneimines or a polymer containing vinylamine units of the formula:
- where R1 is hydrogen or C1-C2-alkyl, with a chloroformic ester in a weight ratio within the range from 100,000:1 to 15:1.
Dependencies are inferred from the claim text.