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US 9,809,722 B2Granted
Transitorially erasable ink compositions and writing instruments containing same
AssigneeSanford, L.P.
InventorsJiandong Zhu, Wing Sum Vincent Kwan
Life of this patent
Estimating the term…
Abstract
The disclosure provides transitorially erasable ink compositions, including an aliphatic hydrocarbon solvent, a rubber dissolved in the aliphatic hydrocarbon solvent, a hydrophilic pigment, and a surfactant. The disclosure further provides methods of preparing transitorially erasable ink compositions and writing instruments comprising transitorially erasable ink compositions. The disclosed erasable ink compositions write well, have strong color and erase easily transitorially, and demonstrate color stability.
Claims20
An erasable ink composition, comprising:
- an aliphatic hydrocarbon solvent;
- a rubber dissolved in the aliphatic hydrocarbon solvent;
- a hydrophilic pigment;
- and
- a surfactant.
2 more elements
A method of making an erasable ink composition comprising:
- combining an aliphatic hydrocarbon solvent, a rubber, a surfactant and a hydrophilic pigment;
- and
- mixing the solvent, rubber, surfactant, and hydrophilic pigment to provide a homogeneous dispersion, thereby forming the erasable ink composition.
Dependencies are inferred from the claim text.