Thermochromic composition
First Claim
1. Reversible thermochromic composition capable on heating of color change from colored to colorless state, comprising four components (1), (2), (3) and (4), each of which is individually different from the other three components, said four components comprising(1) an electron-donating chromogenic material,(2) a 1,2,3-triazole compound having a hydrogen atom at the 1 or 2 N-atom position thereof and which serves ad corresponding color developer for said chromogenic material for reversibly achieving the colored state,(3) a weakly basic, sparingly soluble azomethine or carboxylic acid primary amine salt,said azomethine being selected from the group consisting of compounds having the formulae
N--R'"'"'
space="preserve" listing-type="equation">R--CH═
N--R'"'"'--N--CH--R, and
space="preserve" listing-type="equation">R--N═
HC--R'"'"'--CH═
N--R Wherein R and R'"'"' are each substituents selected from the group consisting of aliphatic, substituted aliphatic, aromatic substituted aromatic, heterrocyclic and substituted amino, the corresponding compound of each such formula including one of an aromatic or a substituted aromatic substituent, andsaid salt having the formula
space="preserve" listing-type="equation">R--(COOH).sub.x. R'"'"'--(NH.sub.2).sub.y wherein R and R'"'"' are the same as defined above and x and y are positive integers, and(4) an alcohol, amide or ester serving as a solvent,each of said azomethine and said salt being capable of dissociating an amine therefrom upon heating, for achieving a desensitizing effect in the presence of said solvent for changing the composition from colored to colorless state.
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Abstract
A thermochromic composition comprising (1) an electron-donating chromogenic material, (2) a 1,2,3-triazole compound, (3) a weakly basic, sparingly soluble azomethine or carboxylic acid primary amine salt, and (4) an alcohol, amide or ester serving as a solvent.
123 Citations
6 Claims
- 1. Reversible thermochromic composition capable on heating of color change from colored to colorless state, comprising four components (1), (2), (3) and (4), each of which is individually different from the other three components, said four components comprising
(1) an electron-donating chromogenic material, (2) a 1,2,3-triazole compound having a hydrogen atom at the 1 or 2 N-atom position thereof and which serves ad corresponding color developer for said chromogenic material for reversibly achieving the colored state, (3) a weakly basic, sparingly soluble azomethine or carboxylic acid primary amine salt, said azomethine being selected from the group consisting of compounds having the formulae - space="preserve" listing-type="equation">R--CH═
N--R'"'"'
space="preserve" listing-type="equation">R--CH═
N--R'"'"'--N--CH--R,and
space="preserve" listing-type="equation">R--N═
HC--R'"'"'--CH═
N--RWherein R and R'"'"' are each substituents selected from the group consisting of aliphatic, substituted aliphatic, aromatic substituted aromatic, heterrocyclic and substituted amino, the corresponding compound of each such formula including one of an aromatic or a substituted aromatic substituent, and said salt having the formula
space="preserve" listing-type="equation">R--(COOH).sub.x. R'"'"'--(NH.sub.2).sub.ywherein R and R'"'"' are the same as defined above and x and y are positive integers, and (4) an alcohol, amide or ester serving as a solvent, each of said azomethine and said salt being capable of dissociating an amine therefrom upon heating, for achieving a desensitizing effect in the presence of said solvent for changing the composition from colored to colorless state. - View Dependent Claims (2, 3)
- space="preserve" listing-type="equation">R--CH═
- 4. Reversible thermochromic composition capable on heating of color change from colored to colorless state, consisting essentially of four components (1), (2), (3) and (4), each of which is individually different from the other three components, said four components consisting essentially of
(1) elctron-donating chromogenic material, (2) a 1,2,3-triazole compound having a hydrogen atom at the 1 or 2 N-atom position thereof and which serves as corresponding color developer for said chromogenic material for reversibly achieving the colored state, (3) a weakly basic, sparingly soluble azomethine or carboxylic acid primary amine salt, said azomethine being selected from the group consisting of compounds having the formulae - space="preserve" listing-type="equation">R--CH═
N--R'"'"'
space="preserve" listing-type="equation">R--CH═
N--R'"'"'--N--CH--R,and
space="preserve" listing-type="equation">R--N═
HC--R'"'"'--CH═
N--Rwherein R and R'"'"' are each substituents selected from the group consisting of aliphatic, substituted aliphatic, aromatic, substituted aromatic, heterocyclic, and substituted amino, the corresponding compound of each such formula including one of an aromatic or a substituted aromatic substituent, and said salt having the formula
space="preserve" listing-type="equation">R--(COOH).sub.x. R'"'"'--(NH.sub.2).sub.ywherein R and R'"'"' are the same as define above and x and y are positive integers, and (4) an alcohol, amide or ester serving as a solvent, each of said azomethine and said salt being capable of dissociating an amine therefrom upon heating, for achieving a desensitizing effect in the presence of said solvent for changing the composition from colored to colorless state. - View Dependent Claims (5, 6)
- space="preserve" listing-type="equation">R--CH═
Specification
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- Resources
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Current AssigneeMatsui Shikiso Chemical Co., Ltd., Sanrio Company Limited (SANRIO)
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Original AssigneeMatsui Shikiso Chemical Co., Ltd., Sanrio Company Limited (SANRIO)
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InventorsShimizu, Goro, Hayashi, Yoshimi
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Primary Examiner(s)Terapane, John F.
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Assistant Examiner(s)Kilby, Catherine S.
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Application NumberUS06/688,629Time in Patent Office1,097 DaysField of Search252/586, 252/600, 252/364, 252/962, 252/408.1, 8/657, 8/938, 503/213, 106/311, 374/162, 116/200, 116/207US Class Current503/213CPC Class CodesC09K 9/02 Organic tenebrescent materialsD06P 1/004 Dyeing with phototropic dye...D06P 1/0096 Multicolour dyeingY10S 252/962 Temperature or thermal historyY10S 428/913 Material designed to be res...
