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US 12,122,930 B2Granted
Color-change and erasable writing compositions, writing instruments, and systems
AssigneeCrayola LLC
InventorsMichael Moskal, Abigail E. Meyer, Margaret Katherine Brogan
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Abstract
The present invention provides writing compositions that are capable of being erased or changed in color chemically. The present invention also provides erasing media for erasing or changing the color of marks produced with the writing compositions, as well as writing systems and incorporating the erasing media and the writing compositions. The present invention further provides writing instruments produced using the writing compositions.
Claims13
A kit comprising:
- a writing instrument, the writing instrument comprising a writing composition including:
- a phenolic resin, the phenolic resin is present in an amount between about 0.1 wt % and 10 wt %;
- a reaction medium comprising stearic acid and stearyl alcohol, and wherein
- the stearic acid is present in an amount between about 35 wt % and 50 wt %, and
- the stearyl alcohol is present in an amount between about 35 wt % and 50 wt %;
- at least one leuco dye present in an amount between about 0.1 wt % and 6 wt %;
- and
- optionally at least one additive that is present in an amount between about 0.1 wt % and 1 wt %;
- and
- an erasing medium comprising:
- water,
- at least one proton donor or electron acceptor,
- at least one surfactant, and
- at least one preservative.
11 more elements
A kit comprising:
- a writing instrument, the writing instrument comprising a writing composition including:
- a phenolic resin,
- a reaction medium comprising one or more of fatty acids, waxes, alkanes, and alkenes,
- at least one leuco dye, and
- optionally at least one additive;
- and
- an erasing medium comprising:
- water present in an amount between about 65 wt % and 95 wt %;
- at least one proton donor or electron acceptor present in an amount between about 1 wt % and 30 wt %;
- at least one surfactant present in an amount between about 0.1 wt % and 2 wt %;
- and
- at least one preservative present in an amount between about 0.5 wt % and 2 wt %.
9 more elements
Dependencies are inferred from the claim text.