Writing ink composition for aqueous ballpoint pen, ballpoint pen employing the same, and process for producing the writing ink composition for aqueous ballpoint pen

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United States of America Patent

PATENT NO 10711147
SERIAL NO

16421845

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Abstract

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The present invention provides an aqueous writing ink composition capable of forming handwriting having both opacity and transparency, also a writing implement using the composition, and further a process for producing the composition. The aqueous writing ink composition according to the present invention comprises a white pigment, resin particles containing styrene-acrylonitrile, a colorant, and a polysaccharide. The content of the white pigment X %, that of the resin particles Y1% and that of the polysaccharide Y2% satisfy the conditions of

description='In-line Formulae' end='lead'0.1≤X≤7,  [1]description='In-line Formulae' end='tail'

description='In-line Formulae' end='lead'0.5<(Y1+Y2)/X, and  [2]description='In-line Formulae' end='tail'

description='In-line Formulae' end='lead'10≤2.5X+(Y1+Y2)≤40.  [3]description='In-line Formulae' end='tail'

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Patent Owner(s)

Patent OwnerAddress
KABUSHIKI KAISHA PILOT CORPORATION (ALSO TRADING AS PILOT CORPORATION)6-21 KYOBASHI 2-CHOME CHUO-KU TOKYO 1048304 ?1048304

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Ohno, Takashi Tokyo-to, JP 181 3105
Okoshi, Aya Tokyo-to, JP 1 1

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