Multistage polymer dispersions, processes for preparing them, and use thereof
First Claim
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1. An aqueous multistage polymer dispersion, comprising:
- a soft phase having a glass transition temperature ranging from −
30°
C. to 0°
C.; and
a hard phase having a glass transition temperature ranging from 20°
C. to 60°
C.,said soft phase and said hard phase each comprising at least one monomer of formula (I);
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Abstract
The present invention relates to aqueous multistage polymer dispersions obtainable by free-radically initiated aqueous emulsion polymerization, having a soft phase and a hard phase, and a hard-to-soft stage ratio of 25% to 95% by weight to 75% to 5% by weight, the glass transition temperature (Tg) of the soft phase, as first stage, being −30 to 0° C. and that of the hard phase, as second stage, being 20 to 60° C., comprising at least one monomer of the general formula I
in which the variables have the following definitions:
- n=0 to 2,
- R1, R2, R3=independently of one another hydrogen or methyl group,
- X=O or NH,
- Y=H, alkali metal or NH4,
to processes for preparing these aqueous polymer dispersions, and to the use thereof as binders in coatings, and also to coatings comprising the polymer dispersion of the invention.
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Citations
16 Claims
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1. An aqueous multistage polymer dispersion, comprising:
-
a soft phase having a glass transition temperature ranging from −
30°
C. to 0°
C.; anda hard phase having a glass transition temperature ranging from 20°
C. to 60°
C.,said soft phase and said hard phase each comprising at least one monomer of formula (I); - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification