| 摘要 |
<p>PURPOSE:To obtain an erasable ink, comprising a specific resin, specified colored spherical fine particles and water, having low permeability to paper surfaces and excellent in erasability due to easy breaking of drawn line films with flexibility of the resin and improved in shelf life. CONSTITUTION:The objective erasable ink comprises (A) a resin having <=0 deg.C film-forming temperature or <=0 deg.C glass transition temperature (preferably a styrene-butadiene latex, etc.), (B) colored spherical fine particles having 1-20mum particle diameter and (C) water (preferably ion exchange water). The amounts of the components are preferably 20-30wt.% component (A), 5-30wt.% component (B) and 30-75wt.% component (C). The viscosity of this ink is 5-35mPa.sec. A surfactant such as sorbitan ester of a fatty acid in an amount of 0.01-4% is preferably added to this ink. Furthermore, the component (B) is obtained by coloring an acrylic resin, a benzoguanamine resin, etc., with a pigment and then forming the resultant colored resin into the spherical fine particles.</p> |
