US 7,547,741 B2
	Preparation of polymer powders
Joachim Pakusch, Speyer (Germany); Markus Koppers, Bad Fallingbostel (Germany); Wolfgang Gaschler, Heidelberg (Germany); Heinrich Sack, Hassloch (Germany); Juergen Schmidt-Thuemmes, Neuhofen (Germany); and Hans-Juergen Denu, Friedelsheim (Germany)
Assigned to BASF Aktiengesellschaft, Ludwigshafen (Germany)
Appl. No. 10/556,681 PCT Filed May 10, 2004, PCT No. PCT/EP2004/004959 § 371(c)(1), (2), (4) Date Nov. 14, 2005, PCT Pub. No. WO2004/101657, PCT Pub. Date Nov. 25, 2004.
Claims priority of application No. 103 22 787 (DE), filed on May 19, 2003.
Prior Publication US 2007/0004834 A1, Jan. 04, 2007
Int. Cl. C08L 33/24 (2006.01); C08F 6/24 (2006.01); C04B 14/06 (2006.01)

U.S. Cl. 524—521  [523/342; 524/5; 525/218; 106/401]

20 Claims

1. A process for preparing a polymer powder comprising evaporating volatile constituents from an aqueous dispersion of a film-forming polymer P, wherein, prior to the evaporation of the volatile constituents, the aqueous polymer dispersion comprises a drying assistant T, present in an amount of from 0.1 to 80% by weight, based on the polymer P of the dispersion, wherein the drying assistant T is polyvinylformamide.