Pentel Kabushiki Kaisha

Hiroyuki Saitou

Yoshitaka Morimoto

Kiyonori Yasuike

Hirohisa Suzuki

Katsuji Arisawa

Haruka Takai

Sachiko Onuki

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.

Ink composition, writing instrument and method for producing ink composition

The ink composition contains titanium oxide particles having an average particle size of 0.1 &#x3bc;m or more and 0.4 &#x3bc;m or less, hollow resin particles having an average particle size of 1.0 &#x3bc;m or more and 2.0 &#x3bc;m or less, a polysaccharide and water, wherein the titanium oxide particles and the hollow resin particles are negatively charged.

Ink composition, writing tool and method for producing ink composition

Growing community of inventors

Ibaraki, Japan

Hiroyuki Saitou