Ink composition, writing instrument and method for producing ink composition
AssigneePentel Kabushiki Kaisha
InventorsSachiko Onuki, Kiyonori Yasuike, Haruka Takai, Hiroyuki Saitou
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Abstract
An ink composition contains a carbon black and/or an organic pigment, water, a polysaccharide, two or more of diols, and particles of an acrylic resin. The two or more of diols include a first diol having from 5 to 7 carbon atoms and a second diol having from 1 to 4 carbon atoms, and a content of the first diol in the ink composition is 0.05 wt % or more.
Claims13
An ink composition comprising:
- a carbon black and/or an organic pigment;
- water;
- a polysaccharide;
- two or more of diols;
- and
- particles of an acrylic resin,
- wherein the two or more of diols include:
- a first diol having from 5 to 7 carbon atoms;
- and
- a second diol having from 1 to 4 carbon atoms, and
- wherein a content of the first diol in the ink composition is 8.0 wt % or more and 22.0 wt % or less,
- wherein a content of the second diol in the ink composition is 4.0 wt % or more and 8.0 wt % or less, and
- wherein a ratio of the content of the first diol to the content of the second diol in the ink composition is 1.5 or more and 5.0 or less.
An ink composition comprising:
- a carbon black and/or an organic pigment;
- water;
- a polysaccharide;
- two or more of diols;
- and
- particles of an acrylic resin,
- wherein the two or more of diols include:
- a first diol having from 5 to 7 carbon atoms;
- and
- a second diol having from 1 to 4 carbon atoms,
- wherein a content of the first diol in the ink composition is 5.0 wt % or more and 28.0 wt % or less,
- wherein the first diol is 2-methylpentane-2,4-diol,
- wherein the second diol includes ethylene glycol or propylene glycol, and
- wherein the polysaccharide includes xanthan gum.
A method for producing an ink composition, comprising a step of dispersing, in water, a carbon black and/or an organic pigment, a polysaccharide, two or more of diols, and particles of an acrylic resin,
- wherein the two or more of diols include a first diol having from 5 to 7 carbon atoms and a second diol having from 1 to 4 carbon atoms, and a content of the first diol in the ink composition is 8.0 wt % or more and 22.0 wt % or less, and a content of the second diol in the ink composition is 4.0 wt % or more and 8.0 wt % or less, and a ratio of the content of the first diol to the content of the second diol in the ink composition is 1.5 or more to 5.0 or less.
Dependencies are inferred from the claim text.