Back to results
US 12,209,192 B2Granted
Opaque ink formulations and associated writing instruments
AssigneeSanford, L.P.
InventorsWing Sum Vincent Kwan, Marty Sexton
Life of this patent
Estimating the term…
Abstract
High opacity permanent ink formulations comprising a solvent, a polymer-based opacifier, a coloring agent, a resin, and a humectant, wherein the ink formulation displays a viscosity of less than about 50 cP, are provided herein.
Claims19
An opaque permanent ink formulation, comprising:
- a solvent;
- a polymer-based opacifier;
- a coloring agent;
- a styrene acrylic resin;
- and
- a humectant,
- wherein the polymer-based opacifier has a specific gravity between 0.9 g/cc and 1.3 g/cc and is a hybrid between an inorganic pigment and an organic polymer;
- and
- wherein the ink formulation displays a viscosity of less than 50 cP.
6 more elements
An opaque permanent ink formulation, comprising:
- a solvent comprising water;
- a polymer-based opacifier;
- a coloring agent;
- a permanent ink resin;
- and
- a humectant,
- wherein the polymer-based opacifier has a specific gravity between 0.9 g/cc and 1.3 g/cc and is a hybrid between an inorganic pigment and an organic polymer;
- wherein the ink formulation displays a viscosity of less than 50 cP;
- and
- wherein the permanent ink resin is a styrene acrylic resin.
7 more elements
Dependencies are inferred from the claim text.