06861475 is referenced by 13 patents and cites 16 patents.

The present invention, a powder composition for making powder coatings comprising one or more than one curable polymer or resin and an agglomerate of a core-shell polymer, wherein the agglomerate of a core-shell polymer has an average particle size of from 5 to 190 microns, preferably from 10 to 127 microns. The powders in accordance with the present invention provide a cured powder coating that is flexible, smooth, and which may be applied in a thickness of only from 0.3 to 8 mils. In a preferred embodiment of making a powder in accordance with the present invention, the agglomerate is cryoground to form a reduced agglomerate prior to adding it into a powder as a post-blend or a powder-forming mixture as a preblend. The preferred core-shell polymer for use in accordance with the present invention comprises an acrylic impact modifier having a poly(methyl methacrylate) shell and a poly(butyl acrylate) core. Further, the preferred curable polymer or resin powder is an epoxy resin, wherein the powder composition is a low temperature curing one component powder composition which cures at from 107 to 149 degrees C.

Title
Smooth, flexible powder coatings
Application Number
10/323121
Publication Number
6861475 (B2)
Application Date
December 18, 2002
Publication Date
March 1, 2005
Inventor
Andrew T Daly
Sinking Spring
PA, US
Gordon Tullos
Reading
PA, US
Michael Louis Spera
Mohnton
PA, US
Casmir Stanislaus Ilenda
Holland
PA, US
Agent
Andrew E C Merriam
Assignee
Rohm and Haas Company
PA, US
IPC
C08J 003/12
C08L 063/00
C08L 051/04
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