A water-in-oil emulsion ink comprises a water phase and an oil phase, wherein the water phase comprises a pigment, a resin and a water-soluble alcohol or polyol with a boiling point greater than 197.degree. C. The ink has improved image recovery properties.
7396396 - Emulsion ink - Owned by GR Advanced Materials Ltd. (Stirling,GB) Tohoku Ricoh Co., Ltd. (Nakanomyo, Shibata-Machi, Shibata-Gun, Miyagi,JP)
A water-in-oil emulsion ink comprises a water phase and an oil phase, wherein the water phase comprises a carbon black pigment having a pH of less than 8 dispersed therein by a water-soluble resin, and wherein the water phase also comprises a pH-adjusting agent to achieve a pH value for the water phase of 8 or greater. The ink maintains stable rheology on ageing, and provides a stable and consistent ink detection signal even after periods of non-use.
7300507 - Emulsion ink - Owned by GR Advanced Materials Ltd. (Stirling,unknown) Tohoku Ricoh Co., Ltd (Shibata-machi, Shibata-gun, Miyagi,JP)
A water-in-oil emulsion ink comprises a water phase and an oil phase, wherein the water phase comprises a carbon black pigment having a pH of less than 6. The emulsion ink maintains stable rheology on ageing.
