Preparation of nonbleeding ink compositions
Abstract
Abstract Nonbleeding ink compositions are prepared comprising a liquid vehicle in which 2 percent to about 10 percent by weight of a carbonaceous material having a benzene discoloration test of not less than about 98 percent is suspended. The carbonaceous particles are produced by coking a petroleum fraction, then calcining the petroleum coke to a volatile combustible hydrocarbon content of less than about 3 percent by weight based on the weight of the coke, then comminuting the resulting product to a particle size of 100 percent less than 2.5 microns and at least 50 percent less than 1.5 microns. The carbon particles are dispersed in a liquid vehicle or varnish comprised of a highly paraffinic oil having a viscosity of from 5 to 10 centipoise at 60* F. in amounts of 2 percent to about 10 percent by weight based on the total weight of the coke and the vehicle. The ink pigment prepared in accordance with the invention preferably has a Cabot Nigrometer rating of from about 80 to about 100.
Inventors
- 👤 William W Gotshall
Bibliographic Details
Claims Analysis
Total Claims: 6References Cited (Backward Citations)
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