Water base pigment ink composition for writing
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United States of America Patent
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-
Jul 17, 1984
Grant Date -
N/A
app pub date -
Oct 21, 1982
filing date -
Nov 7, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A water base pigment ink composition for writing comprises a pigment, a dispersing agent, an anti-drying agent and an aqueous medium, in which said dispersing agent is a water soluble amine salt or ammonium salt of a copolymer comprises at least 50 molar % of a hydrophobic addition-polymerizable monomer and less than 50 molar % of acrylic acid or methacrylic acid, and said anti-drying agent is urea, thiourea or a derivative thereof.
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Cited Art Landscape
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