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US 11,629,256 B2Granted
Thermochromic pigment composition
AssigneeSociete BIC
InventorsChristelle Debrauwer, Anne-Lise Damiano, Alexander Bourque
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Abstract
A thermochromic pigment composition comprising: (A) at least one electron-donor organic dye compound, (B) at least one electron-acceptor compound, and (C) at least one compound. The thermochromic pigment composition is microencapsulated and is useable in writing instruments.
Claims16
Thermochromic pigment composition comprising:
- (A) at least one electron-donor organic dye compound,
- (B) at least one electron-acceptor compound, and
- (C) at least one compound serving as a reaction medium capable of bringing about a reversible electron-acceptance/donation reaction attributable to compounds (A) and (B), the at least one compound including:
- wherein:
- n=0-2, and
- m=5-19
- wherein the thermochromic pigment composition has
- (A) from 1 to 10% by weight of the at least one electron-donor organic dye compound,
- (B) from 1 to 20% by weight of the at least one electron-acceptor compound, and
- (C) from 70 to 98% by weight of the at least one compound including formula (I) based on the total weight of the thermochromic pigment composition.
7 more elements
Thermochromic pigment composition comprising:
- (A) at least one electron-donor organic dye compound,
- (B) at least one electron-acceptor compound, and
- (C) at least one compound including:
- wherein:
- n=0-2,
- m=5-19,
- wherein when m=17, n≠2.
4 more elements
Thermochromic pigment composition comprising:
- (A) at least one electron-donor organic dye compound,
- (B) at least one electron-acceptor compound, and
- (C) at least one compound including:
A method for making a thermochromic pigment composition, comprising:
- admixing
- (A) at least one electron-donor organic dye compound,
- (B) at least one electron-acceptor compound, and
- (C) at least one compound serving as a reaction medium capable of bringing about a reversible electron-acceptance/donation reaction attributable to compounds (A) and (B), the at least one compound including:
- wherein:
- n=0-2, and
- m=5-19.
4 more elements
Dependencies are inferred from the claim text.