Pitch impregnated articles and process for making same
AssigneeAshland Oil, Inc.
InventorCharles R. Gannon
Life of this patent
Estimating the term…
Abstract
Disclosed is a pitch impregnant composition comprising coal tar pitch, oxidized, or unoxidized petroleum pitch with stearic acid, and particulated metallic pigments including copper, aluminum, steel, silver, iron, tin, nickel and zinc metals and copper-zinc alloys. The process comprises forcing the molten impregnant composition into the surface of the porous article preferably by imposing pressure on the impregnant composition while the article to be treated is immersed therein. Articles so treated exhibit a metallic surface appearance.
Claims12
A process for preparing an at least partially impregnated porous article having a metallic colored surface comprising;
- a. mixing a liquid molten pitch selected from the group consisting of coal tar pitch, unoxidized petroleum pitch, oxidized petroleum pitch and mixtures thereof, with stearic acid and a particulated metallic pigment previously milled in the presence of stearic acid;
- in a ratio of about 4 to about 30 parts by weight of added stearic acid per 100 parts by weight of metallic pigment;
- b. immersing said porous article in the resultant mixture of liquid molten pitch, particulated pigment, and stearic acid;
- c. forcing a portion of said liquid mixture into at least part of the pore spaces of said porous article;
- and
- d. removing said article from contact with said mixture of molten pitch, particulated pigment and stearic acid, thereby causing said molten pitch to penetrate at least partially into said porous article and to deposit particulated pigment within the pitch film on the surface of said article.
A porous permeable article having a metallic colored surface and impregnated, at least at its surface, with a pitch selected from the group consisting of coal tar pitch, unoxidized petroleum pitch, oxidized petroleum pitch and mixtures thereof, containing added stearic acid and an at least partially dispersed particulated metallic pigment previously milled in the presence of stearic acid, the ratio of added stearic acid to metallic pigment being between about 4 and about 30 parts by weight per 100 parts by weight of metallic pigment.
The article of claim 9 wherein said dispersed pigment is particulated aluminum.
An impregnated pipe having a metallic colored surface comprising;
- a. a porous tubular body;
- b. a solidified pitch selected from the group consisting of coal tar pitch, oxidized petroleum pitch, unoxidized petroleum pitch and mixtures thereof at least partially permeating into the porous spaces of said tubular body, and forming a film of pitch over at least a portion of the tubular body surface;
- and
- c. stearic acid and aluminum pigment previously milled in the presence of stearic acid contained within said film of pitch, the ratio of stearic acid to pigment being between about 4 and and about 30 parts by weight per 100 parts by weight of metallic pigment.
Dependencies are inferred from the claim text.