Polyurethane based inks for writing instruments
AssigneeBIC Corporation
InventorsQingping Chen, Michael T. Nowak
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Abstract
A non-erasable ink composition suitable for use in writing instruments is described comprising an isocyanate five thermoplastic polyurethane resin, a colorant and an organic solvent. The ink composition may also include a second resin, plasticizers, antioxidants, corrosion inhibitors, lubricants, chemical dispersants, and surfactants. The inks of the present invention exhibit a smooth writing performance and non-seepage.
Claims37
A non-erasable ink composition for a writing instrument comprising an isocyanate free thermoplastic polyurethane resin, an organic solvent and a colorant, wherein the viscosity of the ink composition is from about 1,000 to about 50,000 cps at 20° C., and the thermoplastic polyurethane resin and organic solvent from a homogeneous solution.
A non-erasable ink composition for a writing instrument comprising an isocyanate free thermoplastic polyurethane resin, an organic solvent, a colorant and a second resin, wherein the viscosity of the ink composition is from about 1,000 to about 50,000 cps at 20° C. and the thermoplastic polyurethane resin and organic solvent form a homogeneous solution.
A non-erasable ink composition for a writing instrument comprising an isocyanate free thermoplastic polyurethane resin, an organic solvent, a colorant and a corrosion inhibitor, wherein the viscosity of the ink composition is from about 1,000 to about 50,000 cps at 20° C., and the thermoplastic polyurethane resin and organic solvent from a homogenous solution.
A non-erasable ink composition for a writing instrument comprising an isocyanate free thermoplastic polyurethane resin, an organic solvent, a colorant and a chemical dispersant, wherein the viscosity of the ink composition is from about 1,000 to about 50,000 cps at 20° C. and the thermoplastic polyurethane resin and organic solvent form a homogeneous solution.
A non-erasable ink composition for a writing instrument comprising an isocyanate free thermoplastic polyurethane resin, an organic solvent, a colorant and an antioxidant, wherein the viscosity of the ink composition is from about 1,000 to about 50,000 cps at 20° C., and the thermoplastic polyurethane resin and organic solvent from a homogeneous solution.
A non-erasable ink composition for a writing instrument comprising an isocyanate free thermoplastic polyurethane resin, an organic solvent, a colorant and a plasticizer, wherein the viscosity of the ink composition is from about 1,000 to about 50,000 cps at 20° C., and the thermoplastic polyurethane resin and organic solvent form a homogeneous solution.
A non-erasable ink composition for a writing instrument comprising an isocyanate free thermoplastic polyurethane resin, an organic solvent, a colorant and a lubricant, wherein the viscosity of the ink composition is from about 1,000 to about 50,000 cps at 20° C. and the thermoplastic polyurethane resin and organic solvent from a homogeneous solution.
Dependencies are inferred from the claim text.