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US 6,524,679 B2Granted
Glass reinforced gypsum board
AssigneeBPB Limited
InventorsRobert J. Hauber, Christopher J. Sanders, Mark E. Hennis, Michael P. Fahey
Life of this patent
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AssigneeBPB Limited
InventorsRobert J. Hauber, Christopher J. Sanders, Mark E. Hennis, Michael P. Fahey
Estimating the term…
A multilayer gypsum board having face sheets comprising inorganic fiber, preferably randomly oriented glass fiber, which have been completely impregnated with a gypsum slurry so as to penetrate through the random interstices between the inorganic fibers and to thereby coat the board surfaces with gypsum slurry. The multilayer gypsum board may have a polymeric compound added to unset gypsum the compound may comprise any of the following: polyacrylamide, polymethylacrylamide, polyvinyidene chloride (PVDC), polyamide, poly (hexamethylene adipamide), polyvinylchloride (PVC), polyethylene, cellulose acetate, polyisobutylene, polycarbonate, polypropylene, polystyrene, polychloroprene, styrene, butadiene, natural rubber, poly (2,6 dimethyl pentene oxide), poly (4-methyl-1-pentene) and polydimethyl siloxane. The multilayer gypsum board may comprise a first layer of a mixture of set gypsum having an outer surface and the polymeric compound additive entrained within the set gypsum and being impregnated in a thin sheet of randomly aligned inorganic fibers so as to essentially encase the core gypsum within two facing layers having a combination set gypsum and polymeric compound.
A multilayer gypsum board comprising a first layer of a mixture of set gypsum having at least one polymeric compound entrained within said set gypsum, and a first thin sheet of randomly aligned inorganic fibers said first thin sheet having an outer surface, said outer surface of said first thin sheet being impregnated in and essentially encased within said set gypsum and polymeric compound combination;
A multilayer gypsum board comprising:
A multilayer gypsum board having two outer surface layers, each of said two outer surface layers including a thin at comprising randomly aligned inorganic fibers impregnated by and being essentially encased within a set gypsum, the set gypsum of at least one of said two outer surface layers including at least one polymeric compound entrained within said set gypsum, and a core layer comprised of set gypsum, said set gypsum in said core layer being of a lower density than the set gypsum of said two outer surface layers, the set gypsum in said two outer surface layers being integrally bonded to the set gypsum of said core layer.
Dependencies are inferred from the claim text.