Methods for enhancing the preservation of cellulosic materials and cellulosic materials prepared thereby
AssigneeAmerican Chemet Corporation
InventorDaniel Brimhall
Life of this patent
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Abstract
Methods for treating cellulosic materials comprising introducing a liquid treating composition into the cellulosic material, the treating composition comprising a solution prepared from at least: (i) one or more of a copper amine complex or copper ammine complex, such as copper tetraamine carbonate, (ii) one or more of ammonia or a water-soluble amine and (iii) water; and exposing the cellulosic material provided thereby to carbon dioxide and/or carbonic acid to provide treated cellulosic material, and treated cellulosic materials prepared thereby.
Claims23
A method for treating cellulosic material comprising:
- (a) introducing the cellulosic material to be treated into a vessel;
- (b) introducing a treating composition into the vessel in an amount sufficient to immerse the cellulosic material therein, and thereafter providing a pressure within the vessel for a time sufficient to permit the treating composition to penetrate into the cellulosic material, wherein the treating composition is an aqueous alkaline copper containing solution comprising about 0.01 wt. % to about 10 wt. % copper tetraammine carbonate, the treating composition optionally further comprising one or more of an insecticide, mold inhibitor, algaecide, bactericide, water repellant, colorant or corrosion inhibitor;
- (c) removing from the vessel any treating solution not penetrated into the cellulosic material after immersion;
- (d) introducing carbon dioxide into the vessel;
- and
- (e) removing the treated cellulosic material from the vessel.
A method for treating cellulosic material comprising:
- (a) introducing the cellulosic material to be treated into a vessel;
- (b) introducing a treating composition into the vessel in an amount sufficient to immerse the cellulosic material therein, and thereafter providing a pressure within the vessel for a time sufficient to permit the treating composition to penetrate into the cellulosic material, wherein the treating composition is an aqueous alkaline copper- and zinc-containing solution comprising about 0.01 wt. % to about 10 wt. % copper tetraamine carbonate and about 0.1 wt. % to about 10 wt. % of a zinc tetraammine carbonate;
- (c) removing from the vessel any treating solution not penetrated into the cellulosic material after immersion;
- (d) introducing carbon dioxide into the vessel;
- and
- (e) removing the treated cellulosic material from the vessel.
Dependencies are inferred from the claim text.