Title: Method for preparing an improved creosote wood preservative from a coal tar creosote

Abstract: An improved creosote wood preservative that has a light color and that forms a non-sticky crud deposit is prepared from a coal tar creosote. The coal tar creosote is reacted with one or more of the following groups of neutral compounds: paraformaldehyde, trioxane; or nitrobenzene, nitrotoluene, nitroxylene, tris (hydroxymethyl) nitromethane; or aluminum, zinc or sulfur, to produce a reacted creosote. This reacted creosote is distilled to yield a distillate, which is the improved creosote wood preservative, and a pitch residue.

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Inventors: Greco, Nicholas P. (Pittsburgh, PA, US)
Webb, David A. (Valencia, PA, US)

Application Number: 547859
Filing Date: 1975-02-07
Publication_date: 1976-08-10
Assignee: Koppers Company, Inc. (Pittsburgh, PA)
Primary Class(es): 106/18.31 106/18.33, 106/18.35, 106/18.36, 106/273.1, 106/284, 106/284.4, 208/2, 568/716
Other Classes:
US Patent Ref:

2446250	Aug, 1948	Schuman	260/624.
2764618	Aug, 1956	Cue	260/621.

Other Refs: 1,597,867

Jun, 1970	FR

Primary Examiner: Thomas, Jr., James O.
Assistant Examiner: Lone, W. B.
Attorney: Brumback; Oscar B., Zeh, Jr.; Herbert J., Stachel; Kenneth J.