Claims
- 1. A pitch based impregnant for a carbon or graphite body in the form of a liquid solution of at least 40% by weight of a coal tar pitch or a petroleum pitch in which the solids insoluble in quinoline are present in an amount of less than 1%, said pitch being dissolved in furfural, said solution having a viscosity at room temperature of less than 150 cps and containing at least 5 wt % of an acid catalyst.
- 2. A pitch based impregnant as defined in claim 1 wherein said acid catalyst is selected from the group consisting of sulfuric acid, aromatic sulfonic acid, fluorinated carboxylic acid and esters and anhydrides of acids.
- 3. A pitch based impregnant as defined in claim 2 wherein said catalyst concentration is at least about 10% by weight and said viscosity less than 100 cps.
- 4. A pitch based impregnant as defined in claim 3 wherein said catalyst is selected from the group consisting of benzene sulfonic acid, tri-chloroacetic acid, p-toluene sulfonic acid, methyl-p-toluene sulfonate, methylbenzene sulfonate, benzenedisulfonic acid-dimethyl ester, fluroacetic acid and methanesulfonic acid.
- 5. A pitch based impregnant as defined in claim 4 wherein said Q.I. content is less than 0.1 percent.
Parent Case Info
This application is continuation of prior U.S. application: Ser. No. 08/230,429 Filing Date Apr. 19, 1994 now abandoned which is a continuation of application Ser. No. 07/858,502 Filing Date Mar. 24, 1992 now abandoned.
US Referenced Citations (6)
Continuations (2)
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Number |
Date |
Country |
Parent |
230429 |
Apr 1994 |
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Parent |
858502 |
Mar 1992 |
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