Method of perfusing a porous workpiece with a chemical compositi

Details Method of perfusing a porous workpiece with a chemical compositi Method of perfusing a porous workpiece with a chemical compositi

1991-02-25

1992-03-10

Beck, Shrive

Coating processes

Immersion or partial immersion

Cellulosic base

4274301, B05D 118

Patent

active

050948920

ABSTRACT:
The invention is a method of perfusing a material, such as wood, with a chemical composition that is insoluble in a given first fluid under supercritical conditions. A cosolvent is mixed with the first solvent to provide adequate solubility at supercritical conditions for the chemical composition. The method is useful for uniformly impregnating otherwise difficulty permeable materials. Impregnation of lumber or structural timbers with a preservative would be a typical use of the method.

REFERENCES:
patent: 4582731 (1986-04-01), Smith
patent: 4734451 (1988-03-01), Smith
patent: 4923720 (1990-05-01), Lee et al.

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