Method for imparting flame resistance to wood surfaces
AssigneeThe Dow Chemical Company
InventorsH. Nelson Beck, Dalton C. MacWilliams
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Abstract
Methods for impregnating the pores of at least partially dried wood with a phosphorus nitride, particularly P.sub.3 N.sub.5, to provide flame resistance are described. Preferably liquid slurries of the phosphorus nitride are impregnated into the exposed pores of the wood using pressure or preferably a partial vacuum in a confined space which removes air from the pores and allows the slurry to impregnate the wood. The liquid is then removed from the wood.
Claims20
A method of imparting surface flame resistance to wood which comprises:
- (a) providing at least partially dried wood which has pores in an exposed surface;
- and
- (b) impregnating the pores in the surface of the dried wood with finely divided particles of a phosphorus nitride to form a treated wood.
An improved wood product which exhibits surface flame resistance which comprises:
- (a) an at least partially dried wood which has pores in an exposed surface;
- and
- (b) a finely divided phosphorus nitride in the pores in the surface of the wood.
Dependencies are inferred from the claim text.