Water base pigment ink compositions for use in marking pens
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United States of America Patent
Stats
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Jul 17, 1990
Grant Date -
N/A
app pub date -
Nov 9, 1989
filing date -
Nov 15, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A water base pigment ink composition for use in marking pens which contain an absorbent ink reservoir and a pen tip connected thereto, the ink composition comprising: (a) water in amounts of not less than 50% by weight; (b) an aqueous emulsion of hollow resin particles in amounts of 0.5-40% by weight as solids; (c) a white pigment in amounts of 1-40% by weight; and (d) a water-solubilized .alpha.-methylstyrene/styrene/acrylic acid copolymer which has a weight average molecular weight of 1000-10,000 and a distribution of molecular weight of 0.5-3.3, but which contains substantially no components having a weight average molecular weight of not more than 500, in amounts of 0.1-30% by weight, based on the ink compositions, respectively. The ink composition may contain chromatic or achromatic (other than white) pigments in amounts of 0.1-30% by weight based on the ink composition.
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