Abstract A wood preservative composition having improved penetration properties comprises 15-90% by volume of coal-tar creosote, up to 45% by volume of coal tar, 7-66.5% by volume of paraffinic wax and 0.5-21% by volume of a high boiling paraffinic oil (i.e. an essentially hydrocarbon oil no more than 5% of which boils below 315 DEG C. at 1 atm. pressure), the volumetric ratio of creosote to coal tar being at least 1:1 and of wax to oil 2.3:1 to 19:1. The paraffinic wax may have a m.pt. of 35 DEG -58 DEG C. and the wax and/or oil may have an average M.W. of 280-340. The oil preferably contains at least 80% by volume of paraffinic hydrocarbons. 10 to 85% by volume of the paraffinic wax and oil content of the composition may be constituted by a soft wax product obtained by solvent de-oiling of crude wax obtained by solvent dewaxing of high viscosity index distillate lubricating oil.
A WOOD PRESERVATIVE COMPOSITION COMPRISING (A) AT LEAST ABOUT 51% BY VOLUME OF COAL TAR CREOSOTE, (B) AT LEAST ABOUT 34% BY VOLUME OF COAL TAR, (C) AT LEAST ABOUT 10% TO 66.5% BY VOLUME OF LOW MELTING POINT PARAFFINIC WAX OBTAINED BY SOLVENT DEOILING OF CRUDE WAX OBTAINED BY SOLVENT DEWAXING OF HIGH VISCOSITY INDEX PETROLEUM DISTILLATE LUBRICATING OIL STOCKS, SAID WAX BEING FURTHER CHARACTERIZED AS HAVING NO SUBSTANTIAL AMOUNTS OF MICROCRYSTALLINE OR AMORPHOUS WAX, AN ASTM D87 WAX MELTING POINT OF BETWEEN ABOUT 95*F. AND 135*F. AND AN AVERAGE MOLECULAR WEIGHT OF FROM 280 TO NO MORE THAN 420; (D) AT LEAST ABOUT 3.6-21% BY VOLUME OF HIGH-BOILING PARAFFINIC OIL CONTAINING AT LEAST 80% BY VOLUME OF PARAFFINIC HYDROCARBONS AND NO MORE THAN 20% BY VOLUME AROMATIC HYDROCARBONS, SAID OIL BEING FURTHER CHARACTERIZED AS HAVING NO MORE THAN ABOUT 5% OF AN ESSENTIALLY HYDROCARBON OIL WHICH BOILS BELOW 600* F. WHEN HEATED AT ONE ATMOSPHERE PRESSURE, AN AVERAGE MOLECULAR WEIGHT OF FROM ABOUT 280 TO ABOUT 340, AND THE RELATIVELY NON-POLAR CHARACTERISTICS AND VISCOSITY RANGE OF PETROLEUM DISTILLATE LUBRICATING OILS DERIVED FROM PARAFFINIC, NAPHTHENIC, OR MIXED-BASE CRUDES.
Claim 2
Dependent Claim
189 words
A WOOD PRESERVATIVE COMPOSITION COMPRISING (A) AT LEAST ABOUT 51% BY VOLUME OF COAL TAR CREOSOTE, (B) AT LEAST ABOUT 34% BY VOLUME OF COAL TAR, (C) AT LEAST ABOUT 10% TO 66.5% BY VOLUME OF LOW MELTING POINT PARAFFINIC WAX OBTAINED BY SOLVENT DEOILING OF CRUDE WAX OBTAINED BY SOLVENT DEWAXING OF HIGH VISCOSITY INDEX PETROLEUM DISTILLATE LUBRICATING OIL STOCKS, SAID WAX BEING FURTHER CHARACTERIZED AS HAVING NO SUBSTANTIAL AMOUNTS OF MICROCRYSTALLINE OR AMORPHOUS WAX, AN ASTM D87 WAX MELTING POINT OF BETWEEN ABOUT 95*F. AND 135*F. AND AN AVERAGE MOLECULAR WEIGHT OF FROM 280 TO NO MORE THAN 420; (D) AT LEAST ABOUT 3.6-21% BY VOLUME OF HIGH-BOILING PARAFFINIC OIL CONTAINING AT LEAST 80% BY VOLUME OF PARAFFINIC HYDROCARBONS AND NO MORE THAN 20% BY VOLUME AROMATIC HYDROCARBONS, SAID OIL BEING FURTHER CHARACTERIZED AS HAVING NO MORE THAN ABOUT 5% OF AN ESSENTIALLY HYDROCARBON OIL WHICH BOILS BELOW 600* F. WHEN HEATED AT ONE ATMOSPHERE PRESSURE, AN AVERAGE MOLECULAR WEIGHT OF FROM ABOUT 280 TO ABOUT 340, AND THE RELATIVELY NON-POLAR CHARACTERISTICS AND VISCOSITY RANGE OF PETROLEUM DISTILLATE LUBRICATING OILS DERIVED FROM PARAFFINIC, NAPHTHENIC, OR MIXED-BASE CRUDES.