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US 8,623,462 B2Granted
Redispersible polymer powder composition
AssigneeAkzo Nobel N.V.
InventorsAlexander Zapf, Hans Wicki, Hongli Willimann, Urs Heini
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AssigneeAkzo Nobel N.V.
InventorsAlexander Zapf, Hans Wicki, Hongli Willimann, Urs Heini
Estimating the term…
The present invention pertains to a water-redispersible polymer powder composition based on at least one synthetic polymer and at least one natural latex. Preferably, the polymer powder contains up to about 90 wt. % of at least one water-insoluble, synthetic polymer, up to about 90 wt. % of least one natural latex, about 0 to 50 wt. % of at least one protective colloid, about 2 to 50 wt. % of at least one filler and/or anti-caking agent, as well as optionally further additives. In addition, the invention pertains to a process for the preparation of the polymer powder composition, the use thereof as an additive in building material compositions, as well as building material compositions containing the polymer powder composition.
A water-redispersible polymer powder composition containing at least one modified natural latex obtained by mixing and reacting natural latex with at least one radical initiator and/or with at least one oxidizing agent, wherein the natural latex and the at least one radical initiator and/or at least one oxidizing agent are mixed in an aqueous phase and subsequently drying of the obtained mixture, wherein the drying is selected from spray drying, pulse combustion spray drying, freeze drying, fluidized bed drying, drum drying and flash drying, said water-redispersible polymer powder composition further containing at least one water insoluble, synthetic polymer prepared by means of emulsion, suspension, microemulsion and/or inverse emulsion polymerization.
Dependencies are inferred from the claim text.