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US 10,851,252 B2Granted
Aqueous ink composition for writing instruments
AssigneeMitsubishi Pencil Company, Limited
InventorsKana Miyoshi, Kousuke Ogura, Akiko Hirayama
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Abstract
Provided is an aqueous ink composition for writing instruments, which enables desired colorfulness to be obtained easily. The aqueous ink composition for writing instruments according to the present invention contains: pigmented microspheres each having a matrix comprising water and a polymer, and a water-insoluble dye; and unpigmented microspheres.
Claims14
An aqueous ink composition for writing instruments, comprising:
- water,
- colored microspheres each comprising a matrix composed of a polymer, a resin having an OH group and a water-insoluble dye, and
- non-colored microspheres.
An aqueous ink composition for writing instruments, comprising:
- water,
- colored microspheres each comprising a matrix composed of a polymer and a water-insoluble dye, and
- non-colored microspheres,
- wherein the saturation C*a*b value of the aqueous ink composition for writing instruments in the L*a*b* color system according to JIS Z8781 is not less than 140% the saturation C*a*b value of an aqueous ink composition for writing instruments the same thereas but which does not comprise non-colored microspheres.
1 more element
Dependencies are inferred from the claim text.