High temperature ink with ambient temperature utility and method of preparation
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United States of America Patent
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May 3, 1988
Grant Date -
N/A
app pub date -
Nov 6, 1986
filing date -
Nov 6, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A composition to produce an adherent and water insoluble deposit on substrate surfaces. An ink or other coating material for these surfaces is described which can be applied at any temperature up to at least 2,000 degrees Fahrenheit, with the resultant deposit (after drying) being highly adherent and water insoluble. As an ink, this composition is useful to produce bar codes on metals to identify the composition, heat treatment, customer, sections for other processing, etc. This ink (coating) has a liquid phase formed from at least water, a pre-reacted lithium silicate, and unreacted lithium hydroxide monohydrate. Preferably, the liquid phase contains a dispersent in the form of a clay, for example. Typically the pre-reacted Li.sub.2 O-SiO.sub.2 has a SiO.sub.2 :Li.sub.2 O molar ratio of about 4.6:1, and the unreacted LiOH.multidot.H.sub.2 O provides from 1/3 to 2/3 the total lithium oxide content, giving a final SiO:Li.sub.2 O molar ratio of the composition of from about 1.71:1 to about 2.97:1. To this liquid phase is added a pigment, typically TiO.sub.2 or MnO-Fe.sub.2 O.sub.3 at about 12-60 wt % based upon the liquid phase. A range of compositions is discussed as well as typical results.
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