E - Fixed Constructions – 04 – C
Patent
E - Fixed Constructions
04
C
E04C 2/26 (2006.01) C04B 20/00 (2006.01) C04B 26/02 (2006.01) E04B 9/04 (2006.01) E04C 5/07 (2006.01) E04F 13/00 (2006.01)
Patent
CA 2268722
This invention provides a ceiling board having a durable edge portion. The durable edge portion is obtained by applying a latex composition to the edge portion. The latex composition includes a binder and filler particles of two particle size ranges. The first filler particles have a median diameter of about 0.5 micron to about 5 microns. The second filler particles have a median diameter of about 20 microns to about 300 microns. The ratio of first filler particles to second filler particles is about 2:1 to about 1:8 by weight The binder is preferably an epoxy, a urethane, a polyester, an acrylic, a melamine, or a vinyl based polymer latex. The binder preferably has a Tg of at least 10°C, and the ratio of filler to binder is about 2:1 to about 12:1 by weight.
Armstrong World Industries Inc.
Gowling Lafleur Henderson Llp
LandOfFree
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