Aqueous ink and process for its manufacture
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United States of America Patent
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Sep 13, 1988
Grant Date -
N/A
app pub date -
Oct 28, 1987
filing date -
Oct 29, 1986
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention relates to an aqueous ink for writing, drawing, or marking, which has as a dispersion stabilizer a degradation product of gelatin made by enzymatic action of a protease. The process of the invention is carried out by subjecting an aqueous gelatin solution to degradation by an enzyme, then inhibiting the enzyme, such as by heating to 90 degrees C. or above, before the degradation has proceeded to products which no longer have activity as dispersion stabilizers. Subsequently, colorants such as pigments can be added along with other desired additives.
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