Pigment dispersions, and writing instruments and printers with the dispersions stored therein
AssigneeDainichiseika Color & Chemicals Mfg. Co., Ltd.
InventorsKazuo Kanou, Yoshifumi Sugito, Hiroaki Saikatsu
Life of this patent
Estimating the term…
Abstract
A pigment dispersion is composed of a pigment, a polymer and a solvent. The polymer has, on side chains thereof, carboxyl groups derived from a dibasic acid. The pigment dispersion is useful for writing instruments and printers.
Claims34
An alcoholic-based or a mixed alcohol and at least one of an ester and a ketone-based pigment dispersion, comprising a pigment, a polymer and a solvent, wherein said polymer has, on side chains thereof, carboxyl groups from a dibasic acid;
- wherein said polymer is a polymer of an addition-polymerizable monomer which is a reaction product between a dibasic acid anhydride of a cyclic compound and a hydroxyl-containing addition-polymerizable monomer;
- wherein said monomer is at least one monomer selected from the group consisting of (meth)acryloyloxyethyl phthalate, (meth)acryloyloxypropyl phthalate, (meth)acryloyloxybutyl phthalate, (meth)acryloyloxyalkyl hexahydrophthalates, (meth)acryloyloxyalkyl tetrahydrophthalates, (meth)acryloyloxyalkyl 3,6-endomethylene-1,2,3,6-tetrahydrophthalates, and mono(meth)acryloyloxyalkyl 2,3-naphthalene dicarboxylates;
- and
- wherein said pigment has been subjected to cationization treatment by adsorption or deposition of an amino-containing compound or by salt formation by reaction with the amino-containing compound.
An alcoholic-based or a mixed alcohol and at least one of an ester and a ketone-based pigment dispersion, comprising a pigment, a polymer and a solvent, wherein the solvent is an alcohol or a mixture of an alcohol and at least one of an ester and a ketone;
- wherein said polymer has, on side chains thereof, carboxyl groups from a dibasic acid;
- wherein said polymer is a polymer of an addition-polymerizable monomer which is a reaction product between a dibasic acid anhydride of a cyclic compound and a hydroxyl-containing addition-polymerizable monomer;
- wherein said monomer is at least one monomer selected from the group consisting of (meth)acryloyloxyethyl phthalate, (meth)acryloyloxypropyl phthalate, (meth)acryloyloxybutyl phthalate, (meth)acryloyloxyalkyl hexahydrophthalates, (meth)acryloyloxyalkyl tetrahydrophthalates, (meth)acryloyloxyalkyl 3,6-endomethylene-1,2,3,6-tetrahydrophthalates, and mono(meth)acryloyloxyalkyl 2,3-naphthalene dicarboxylates;
- and
- wherein said pigment has been subjected to cationization treatment by adsorption or deposition of an amino-containing compound or by salt formation by reaction with the amino-containing compound.
An alcoholic-based or a mixed alcohol and at least one of an ester and a ketone-based pigment dispersion, consisting essentially of a pigment, a polymer and a solvent, wherein the solvent is an alcohol or a mixture of an alcohol and at least one of an ester and a ketone;
- wherein said polymer has, on side chains thereof, carboxyl groups from a dibasic acid;
- wherein said polymer is a polymer of an addition-polymerizable monomer which is a reaction product between a dibasic acid anhydride of a cyclic compound and a hydroxyl-containing addition-polymerizable monomer;
- wherein said monomer is at least one monomer selected from the group consisting of (meth)acryloyloxyethyl phthalate, (meth)acryloyloxypropyl phthalate, (meth)acryloyloxybutyl phthalate, (meth)acryloyloxyalkyl hexahydrophthalates, (meth)acryloyloxyalkyl tetrahydrophthalates, (meth)acryloyloxyalkyl 3,6-endomethylene-1,2,3,6-tetrahydrophthalates, and mono(meth)acryloyloxyalkyl 2,3-naphthalene dicarboxylates;
- and
- wherein said pigment has been subjected to cationization treatment by adsorption or deposition of an amino-containing compound or by salt formation by reaction with the amino-containing compound.
Dependencies are inferred from the claim text.