EP0595577A2
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EP
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Thermochromic opaque composition and uses thereof
Assignee: Pilot Ink Co Ltd
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Filing: 1993-10-25
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Granted: —
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Expires: 2013-10-25
Abstract
Abstract There are provided a thermochromic opaque composition capable of exhibiting change in transparency together with change in color in response to temperature variation, a laminate member employing the same, and a three-dimensional article capable of concealing and revealing the interior, utilizing the laminate member. The thermochromic opaque composition is formed by dispersing a thermochromic material, capable of developing and erasing color by an electron donating-accepting reaction, in small particles in vinyl chloride-vinyl acetate matrix resin. The above-mentioned structure realizes reversible change in transparency, together with change in color, in response to temperature variation, with hysteresis with a temperature difference of 10°C at minimum to 50°C between the high and low trigger temperatures.
Inventors
- 👤 Tsutomo Kito
- 👤 Kuniyuki Senga
- 👤 Hiroyuki Hayashi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 19:46
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/26; B41M5/30; B41M5/305; B41M5/333; B41M5/3333; B41M5/3335; B41M5/337; B41M5/3372; B41M5/3375; B44; B44F; B44F1/00; B44F1/08; C; C09; C09K; C09K9/00; C09K9/02; B41M2205/00; B41M2205/04; B41M5/323; B41M5/327; B41M5/3275; Y; Y10; Y10S; Y10S252/00; Y10S252/962
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
87 words
A thermochromic opaque composition, composed of dispersion, in particulate manner in vinyl chloridevinyl acetate copolymer matric resin, of a reversible thermochromic material consisting of (a) an electron-donating color-developing organic compound, (b) a compound having a phenolic hydroxyl radical, and (c) a compound selected from alcohols, esters, ketones and carboxylic acids, and capable of exhibiting reversible change in transparency together with change in color in response to temperature variation, with hysteresis with a temperature difference of 10°C at minimum to 50°C between the low and high trigger temperatures.
Claim 2
Dependent Claim
36 words
A thermochromic opaque composition according to claim 1, wherein said reversible thermochromic material is dispersed, in particles of a size within a range of 0.1 to 2.0 µm in the vinyl chloride-vinyl acetate copolymer matrix resin.
Claim 3
Dependent Claim
80 words
A thermochromic opaque composition according to claim 1, composed with a ratio, with respect to 6 parts by weight of the vinyl chloride-vinyl acetate copolymer resin, of (a) electron-donating color-developing organic compound within a range of 0.05 to 2.0 parts by weight, (b) compound having a phenolic hydroxyl radical within a range of 0.1 to 3.0 parts by weight, and (c) compound selected from alcohols, esters, ketones and carboxylic acids within a range of 0.5 to 5.0 parts by weight.
Claim 4
Dependent Claim
53 words
A thermochromic opaque composition according to claim 1, wherein said vinyl chloride-vinyl acetate copolymer resin has an average molecular weight within a range from 7,000 to 50,000, and has a constituent monomer ratio of vinyl chloride within a range of 60 to 92% and vinyl acetate within a range of 8 to 40%.
Claim 5
Dependent Claim
33 words
A thermochromic opaque composition according to claim 1, further comprising, with respect to 100 parts by weight of said composition, a dispersing agent in a ratio of 0.002 to 0.5 parts by weight.
Claim 6
Dependent Claim
80 words
A thermochromic opaque composition according to claim 1, wherein at least 50 wt.% of the compound having phenolic hydroxyl radical is selected from the compound represented by the following general formula: wherein R1 stands for H or CH₃, R2 stands for C n H 2n+1 (4 < n < 11), which is a straight-chain or branched chain alkyl radical, or R1 = R2 = CF₃, and X stands for a substituent which is H or CH₃ on the aromatic ring.
Claim 7
Dependent Claim
123 words
A thermochromic opaque composition according to claim 1, wherein said component (c) is one or more esters selected from (a) esters each consisting of a monobasic fatty acid and an aliphatic or alicyclic monohydric alcohol and having 10 or more carbon atoms in total, (b) polybasic acid esters each consisting of an aliphatic di- or polybasic carboxylic acid and an aliphatic or alicyclic monohydric alcohol and having 28 or more carbon atoms in total, (c) esters each consisting of an aliphatic di- or polyhydric alcohol and a monobasic fatty acid and having 26 or more carbon atoms in total, and (d) esters each consisting of an aromatic dihydric alcohol and a monobasic fatty acid and having 28 or more carbon atoms in total.
Claim 8
Dependent Claim
98 words
A laminate member comprising, on a substrate, a laminated layer of a thermochromic opaque composition, composed of dispersion, in particulate manner in vinyl chloride-vinyl acetate copolymer matrix resin, of a reversible thermochromic material consisting of (a) an electron-donating color-developing organic compound, (b) a compound having a phenolic hydroxyl radical, and (c) a compound selected from alcohols, esters, ketones and carboxylic acids, and capable of exhibiting reversible change in transparency together with change in color in response to temperature variation, with hysteresis with a temperature difference of 10°C at minimum to 50°C between the low and high trigger temperatures.
Claim 9
Dependent Claim
14 words
A laminate member according to claim 8, wherein said substrate is a transparent substrate.
Claim 10
Dependent Claim
35 words
A laminage member according to claim 8, wherein said substrate is composed of a material showing various optical properties, such as lustre, lustrous reflectance, optical interference, iridescence, holographic property, metallic lustre, pearl lustre or fluorescence.
Claim 11
Dependent Claim
31 words
A laminate member according to claim 8, wherein said substrate is provided thereon with an undercoat layer consisting of methacrylic resin with the glass transition point at least equal to 90°C.
Claim 12
Dependent Claim
38 words
A laminate member according to claim 8, wherein the layer of the thermochromic opaque composition is provided thereon with a layer consisting of transparent methacrylic or acrylic resin or copolymer resin thereof, soluble in alcohol or aliphatic hydrocarbon.
Claim 13
Dependent Claim
46 words
A three-dimensional article capable of concealing or revealing the interior, of which at least a part is composed of the laminate member according to claim 8, 9, 11 or 12, whereby an object inside said article can be concealed or revealed in response to temperature variation.
Claim 14
Dependent Claim
18 words
A three-dimensional article according to claim 13, which is a toy, a stationary article or a teaching aid.
References Cited (Backward Citations)
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