US 11,697,743 B2
Ink composition, writing instrument and method for producing ink composition
Sachiko Onuki, Saitama (JP); Kiyonori Yasuike, Saitama (JP); Haruka Takai, Saitama (JP); and Hiroyuki Saitou, Ibaraki (JP)
Assigned to PENTEL KABUSHIKI KAISHA
Appl. No. 16/464,607
Filed by PENTEL KABUSHIKI KAISHA, Tokyo (JP)
PCT Filed Jun. 14, 2017, PCT No. PCT/JP2017/022021
§ 371(c)(1), (2) Date May 28, 2019,
PCT Pub. No. WO2018/105151, PCT Pub. Date Jun. 14, 2018.
Claims priority of application No. PCT/JP2016/086106 (WO), filed on Dec. 5, 2016.
Prior Publication US 2021/0095144 A1, Apr. 1, 2021
Int. Cl. C09D 11/17 (2014.01); B43K 7/02 (2006.01); C08K 3/04 (2006.01); C08K 5/053 (2006.01); C08L 5/00 (2006.01); C09D 11/18 (2006.01); C08L 25/06 (2006.01); C08L 33/02 (2006.01)
CPC C09D 11/17 (2013.01) [B43K 7/02 (2013.01); C08K 3/04 (2013.01); C08K 5/053 (2013.01); C08L 5/00 (2013.01); C08L 25/06 (2013.01); C08L 33/02 (2013.01); C09D 11/18 (2013.01); C08K 2201/005 (2013.01)] 13 Claims
OG exemplary drawing
 
1. 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.