AQUEOUS INK COMPOSITION FOR WRITING INSTRUMENTS
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United States of America Patent
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Issued Date -
Sep 28, 2017
app pub date -
Sep 11, 2015
filing date -
Sep 25, 2014
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Abstract
Provided is an aqueous ink composition for a writing instrument which is excellent in storage stability of particles, such as pigments, a writing property with the passage of time, followability, and quality of the drawn lines, though having a low viscosity, as compared with aqueous ink compositions prepared by using conventional thickeners and gelling agents, such as xanthan gum. The ink composition for a writing instrument described above includes an aqueous ink composition for a writing instrument containing 0.05 to 1.5% by mass of an oxidized cellulose and having a limiting viscosity of 16 mPa·s or less derived from Casson's equation, a viscosity value of 100 to 3000 mPa·s at a shear rate of 3.83 s−1 and a viscosity value of 10 to 40 mPa·s at a shear rate of 383 s−1.
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