COMPOSITIONS AND METHODS FOR TREATING CELLULOSE-BASED MATERIALS WITH MICRONIZED ADDITIVES
A composition for treating cellulosic materials is provided. The composition comprises a dispersion of micronized additives. The dispersion comprises additive particles with diameters in the range of 0.001 to 25 microns. Also provided is a method for the application of the additive-containing composition to wood, as well as wood products which have been treated with the composition.
1 . Wood comprising:
a) an aqueous composition comprising one or more solid particles of an additive dispersed in water having diameters in the range of 0.001 to 25 microns;
b) wherein at least some of the particles penetrate the surface of the wood and are distributed throughout a cross section of the wood; and
c) wherein the additive is carbon black or black iron oxide; and greater than 80 weight percent of the particles have diameters less than 1 micron.
2 . Wood treated by a process comprising the steps of:
a) providing an aqueous composition comprising one or more solid particles of a first additive and a second additive dispersed in water, said particles having diameters in the range of 0.001 to 25 microns; and
b) applying said composition to the wood such that at least some of the particles penetrate the surface of the wood and are distributed throughout a cross section of the wood;
wherein the first additive is carbon black or black iron oxide; greater than 80 weight percent of the particles of the first additive have diameters less than 1 micron; and the second additive is zinc oxide, titanium dioxide, or an aluminum flake pigment;
wherein the first and second additives are applied to the wood by pressure treatment, vacuum treatment, or both; and
wherein the wood comprises solid particles of the first and second additives inside the wood.
3 . Wood of claim 2 , wherein said aqueous composition further comprises one or more additives selected from the group consisting of inorganic pigments, organic pigments, water repellants, anti-weathering agents, and dimensional stabilization agents.
4 . Wood of claim 1 , wherein said aqueous composition further comprises an additive which is zinc oxide, titanium dioxide, or an aluminum flake pigment.
5 . Wood of claim 4 , wherein said aqueous composition further comprises a biocide.
6 . Wood of claim 5 , wherein said biocide is solid.
7 . Wood of claim 6 , wherein said solid biocide is copper or a copper compound.
8 . Wood of claim 4 , wherein said aqueous composition further comprises a colorant.
9 . Wood of claim 4 , wherein said aqueous composition further comprises one or more organic pigments.
10 . Wood of claim 4 , wherein said aqueous composition further comprises one or more inorganic pigments.