C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
6/158
C08L 95/00 (2006.01) C10C 3/04 (2006.01)
Patent
CA 1225502
ABSTRACT IMPROVED TAR FRACTION FOR DRIVEWAY SEALERS USING OXIDIZED COAL TAR DISTILLATE A driveway sealer less affected by temperature extremes can be made from an oxidized coal tar distilla- tion cut. The sealer incorporates a middle cut crude distillate which is oxidized to produce a product of desired viscosity. The sealer incorporating this oxi- dized middle cut is less affected by extremes in weather as compared to regular sealer tar. It has more con- sistent physical properties. A significant distinguish- ing characteristic derived from the use of this tar in a driveway sealer is the reduced odor of the resulting sealer. The oxidation (condensation) step is carried out at elevated temperature by sparging copious quanti- ties of air rapidly into the tar at elevated tempera- tures of the order of about 300°F to 800°F (200°C - 430°C).
467861
Bart Edward F.
Chu Arthur S.
Cook George R.
Allied Corporation
Gowling Lafleur Henderson Llp
LandOfFree
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