Reversible thermochromic aqueous ink composition and writing instrument using same
A technology for writing instruments and compositions, applied in writing instruments, household appliances, inks, etc., can solve the problems of easy pigment sedimentation, reduced ink discharge, low viscosity, etc., and achieve the effect of excellent dispersion stability
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[0267] Example 1
[0268] Preparation of microcapsule pigments
[0269] A microcapsule pigment suspension containing a reversible thermochromic composition with color memory was obtained. The reversible thermochromic composition is composed of 3',6'-bis[phenyl(3- Methylphenyl)amino]-spiro[isobenzofuran-1(3H), 9'-[9H]xanthene]-3-one 3.00 parts, 4-4'-[2, as (b) component 2,2-Trifluoro-1-(trifluoromethyl)ethylene)biphenyl 5.00 parts, 4-4'-(2-ethylhexylene)bisphenol 3.00 parts, (c) component cyclohexyl It is composed of 50.00 parts of methyl-4-biphenylacetate.
[0270] The suspension is centrifuged to isolate the microcapsule pigment.
[0271] The average particle size of the microcapsule pigment is 1.9μm, the complete decolorization temperature is 61-62°C, the complete color development temperature is -20°C, and the temperature changes from blue to colorless.
[0272] Preparation of ink composition
[0273] 0.40 parts of a polymer flocculant (hydroxyethyl cellulose, trade name CELLOSIZE ...
Example Embodiment
[0284] Example 2
[0285] Preparation of microcapsule pigments
[0286] A microcapsule pigment suspension containing a reversible thermochromic composition with color memory was obtained. The reversible thermochromic composition is composed of 3',6'-bis[phenyl(3- Methylphenyl)amino]-spiro[isobenzofuran-1(3H), 9'-[9H]xanthene]-3-one 3.00 parts, 4-4'-[2, as (b) component 2,2-Trifluoro-1-(trifluoromethyl)ethylene)biphenol 5.00 parts, 4-4'-(2-ethylhexylene)bisphenol 3.00 parts, (c) component 2- [4-(Phenylmethoxy)phenyl]ethyl decanoate is composed of 50.00 parts.
[0287] The suspension is centrifuged to isolate the microcapsule pigment.
[0288] The average particle size of the microcapsule pigment is 1.9μm, the complete decolorization temperature is 60°C, and the complete color development temperature is -20°C, and changes from blue to colorless by temperature changes.
[0289] Preparation of ink composition
[0290] 0.40 parts of a polymer flocculant (hydroxyethyl cellulose, trade name ...
Example Embodiment
[0300] Example 3
[0301] Preparation of microcapsule pigments
[0302] A microcapsule pigment suspension containing a reversible thermochromic composition with color memory was obtained. The reversible thermochromic composition was composed of 6'-(diphenylamino)-2'- as component (a). [(3-(Trifluoromethyl)phenyl)-(Dipentylamino)-2'-[(3-(Trifluoromethyl)phenyl)amino]-spiro[isobenzofuran-1(3H ), 6.00 parts of 9'-(9H)xanthene]-3-one, 4-4'-[2,2,2-trifluoro-1-(trifluoromethyl)ethylene as component (b) ] 6.00 parts of biphenols, 4.00 parts of 4-4'-(2-ethylhexylene) bisphenols, and 50.00 parts of cyclohexylmethyl-4-biphenyl acetate as the component (c).
[0303] The suspension is centrifuged to isolate the microcapsule pigment.
[0304] The average particle size of the microcapsule pigment is 1.9μm, the complete decolorization temperature is 61-62°C, the complete color development temperature is -20°C, and the temperature changes from green to colorless.
[0305] Preparation of ink composit...
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