AQUEOUS POLYMER DISPERSION
First Claim
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1. Aqueous, polymer dispersion comprising at least one core copolymer A) and at least one shell copolymer B), wherein the glass transition temperature (Tg) of the core is from 70°
- C. to 100°
C., the glass transition temperature (Tg) of the shell is from 20°
C. to 55°
C. and the overall glass transition temperature (Tg) of the core-shell copolymer is from 30°
C. to 80°
C., and the dispersion contains an emulsifier content in an amount of ≦
1.5 wt. %, based on the solids.
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Abstract
The present invention relates to aqueous polymer dispersions having a core-shell structure, to a method for the production thereof and to the use thereof as a coating agent.
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12 Claims
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1. Aqueous, polymer dispersion comprising at least one core copolymer A) and at least one shell copolymer B), wherein the glass transition temperature (Tg) of the core is from 70°
- C. to 100°
C., the glass transition temperature (Tg) of the shell is from 20°
C. to 55°
C. and the overall glass transition temperature (Tg) of the core-shell copolymer is from 30°
C. to 80°
C., and the dispersion contains an emulsifier content in an amount of ≦
1.5 wt. %, based on the solids. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 10, 11, 12)
- C. to 100°
-
9. Process for the preparation of the polymer dispersion, wherein water, emulsifier and optionally a small amount of initiator are first placed in a reaction vessel, then a metered addition of an amount of monomers a) to c) of from 1 to 10 wt. % is carried out, optionally with the simultaneous metered addition of the initiator, to form an internal seed, and monomers a) to d) for copolymer A) (core) are then added stepwise to the internal seed and polymerised to a conversion of at least 5.0 wt. %, in each case based on their total weight, and monomers a) to d) for copolymer B) are added and polymerised to a conversion of at least 85.0 wt. %, in each case based on their total weight.
Specification