08-08-2013 дата публикации
Номер: US20130203926A1
Принадлежит:
Cement-free aqueous polymer dispersion comprising calcium silicate hydrate. 1. A cement-free aqueous dispersion comprising in dispersed form particles of a polymer P and particles of a calcium silicate hydrate , wherethe polymer P has a number-average particle diameter ≧10 and ≦1000 nm and a glass transition temperature in the range ≧−55 and ≦30° C. and is composed in copolymerized form of{'sub': 3', '6', '4', '6, '≧0.1% and ≦10% by weight of at least one hydroxyalkyl acrylate, hydroxyalkyl methacrylate and/or an amide of an α,β-monoethylenically unsaturated Cto Cmonocarboxylic or Cto Cdicarboxylic acid (monomers A),'}{'sub': 3', '6', '4', '6, '≧0% and ≦0.5% by weight of at least one α,β-monoethylenically unsaturated Cto Cmonocarboxylic or Cto Cdicarboxylic acid (monomers B),'}≧0% and ≦10% by weight of methyl methacrylate (monomer C), and≧90% and ≦99.9% by weight of at least one further ethylenically unsaturated monomer which is different from the monomers A to C (monomers D),the amount of the monomers A to D adding up to 100% by weight, and wherethe calcium silicate hydrate has a weight-average particle diameter ≧0.1 and ≦100 nm.2. The aqueous dispersion according to claim 1 , where the calcium silicate hydrate has the following average composition:{'br': None, 'sub': a', '2', 'b', 'c', '2', '2', '3', 'd', '2', 'e, '(CaO)(XO)(YO)SiO(AlO)(HO),'}whereX is sodium and/or potassium,Y is magnesium, strontium and/or barium, anda: stands for a value ≧0.1 and ≦2,b: stands for a value ≧0 and ≦0.5,c: stands for a value ≧0 and ≦2,d: stands for a value ≧0 and ≦1, ande: stands for a value ≧1 and ≦6.3. The aqueous dispersion according to either of and claim 1 , wherea: stands for a value ≧0.6 and ≦1.8,b: stands for a value ≧0 and ≦0.2,c: stands for a value ≧0 and ≦0.1,d: stands for a value ≧0 and ≦0.1, ande: stands for a value ≧1 and ≦6.4. The aqueous dispersion according to any of to claim 1 , where the calcium silicate hydrate has been prepared by reacting sodium metasilicate [ ...
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