Wood-based refined tar-containing coating compositions

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...

Reexamination Certificate

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Reexamination Certificate

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06995199

ABSTRACT:
An aqueous tar solution having excellent stability in which tar is dissolved in a liquid and which does not cause precipitation or separation, as well as a tar-containing coating composition having highly rot- and termite-proofing effects, are provided. The aqueous tar solution is obtained by mixing 10 to 50 g of a 10–50% NaOH solution is mixed, relative to 100 g of tar, to produce a processed tar, and further mixing and dissolving 100 g of a 2–5% NaOH solution, relative to 10 to 20 g of the processed tar. The tar-containing coating composition is obtained by mixing the aqueous tar solution in an aqueous coating composition having resin as the major component and containing charcoal powder.

REFERENCES:
patent: 08-143401 (1996-06-01), None
patent: 2002-000093 (2002-01-01), None
patent: 2002-167306 (2002-06-01), None
patent: 99/48656 (1999-09-01), None
patent: 00/02716 (2000-01-01), None
Brossard, P.L.E., et al., Biomass and Bioenergy, vol. 12, No 5, pp. 363-366 (1997).
Chakma, A., et al., J. Can. Pet. Technol., vol. 32, No. 5, pp. 48-51 (1993)
Mikula, R.J., et al., Fuel Sci. Technol. Int., vol. 7, No. 5-6, pp. 727-749, (1989).

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