US5585425A
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US
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Thermochromic opaque/transparent composition, laminate member employing the same, and three-dimensional member employing said laminate member and capable of concealing and revealing the interior
Assignee: Pilot Ink Co Ltd
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Filing: 1995-03-23
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Granted: 1996-12-17
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Expires: 2015-03-23
Abstract
Abstract A thermochromic opaque/transparent composition is 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. A thermochromic opaque/transparent composition is composed of dispersion, in vinyl chloridevinyl acetate copolymer matric resin, which has been obtained by blending with hindered amine compound selected from piperidine derivatives within a particle size range of 0.1 to 2.0 μm, 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 homogeneous fused composition containing 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. to 50° C. between the low and high trigger temperatures.
Inventors
- 👤 Tsutomu Kito
- 👤 Kuniyuki Senga
- 👤 Hiroyuki Hayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:54
CPC Classifications
B; B44; B44F; B44F1/00; B44F1/08; C; C09; C09K; C09K9/00; C09K9/02; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31928; Y10T428/31935
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
200 words
A thermochromic opaque/transparent composition wherein a reversible thermochromic material having a particle size in the range of from 0.1 to 2.0 μm and which is a homogeneous fused composition comprising (a) an electron-donating color-developing organic compound, (b) a compound having a phenolic hydroxyl radical, and (c) a compound selected from the group consisting of alcohols, esters, ketones and carboxylic acids, is dispersed and fixed in a vinyl chloride-vinyl acetate copolymer matrix resin in which at least one piperidine derivative has been blended, said matrix resin having an average molecular weight within a range from 7,000 to 50,000 and constituent monomer ratios of vinyl chloride within a range of 60 to 92% and vinyl acetate within a range of 8 to 40%, said thermochromic opaque/transparent composition being capable of exhibiting reversible change in transparency together with change in color in response to temperature variation to exhibit a transparent state in a temperature range above a high trigger temperature and a colored opaque state in a temperature range below a low trigger temperature with a hysteresis having a temperature difference of 10° C. to 50° C., both states being selectively held in a temperature range between said low and high trigger temperatures.
Claim 2
Dependent Claim
200 words
A thermochromic opaque/transparent composition wherein a reversible thermochromic material having a particle size in the range of from 0.1 to 2.0 μm and which is a homogeneous fused composition comprising (a) an electron-donating color-developing organic compound, (b) a compound having a phenolic hydroxyl radical, and (c) a compound selected from the group consisting of alcohols, esters, ketones and carboxylic acids, is dispersed and fixed in a vinyl chloride-vinyl acetate copolymer matrix resin in which at least one piperidine derivative has been blended, said matrix resin having an average molecular weight within a range from 7,000 to 50,000 and constituent monomer ratios of vinyl chloride within a range of 60 to 92% and vinyl acetate within a range of 8 to 40%, said thermochromic opaque/transparent composition being capable of exhibiting reversible change in transparency together with change in color in response to temperature variation to exhibit a transparent state in a temperature range above a high trigger temperature and a colored opaque state in a temperature range below a low trigger temperature with a hysteresis having a temperature difference of 10° C. to 50° C., both states being selectively held in a temperature range between said low and high trigger temperatures.
Claim 3
Dependent Claim
98 words
A thermochromic opaque/transparent composition according to claim 1, composed with a ratio, with respect to 100 parts by weight of the vinyl chloride vinyl acetate copolymer resin, of hindered amine compound selected from piperidine derivatives within a range of 0.1 to 10 parts by weight, (a) electron-donating color-developing organic compound within a range of 0.8 to 33 parts by weight, (b) compound having a phenolic hydroxyl radical within a range of 1.6 to 50 parts by weight, and (c) compound selected from alcohols, esters, ketones and carboxylic acids within a range of 8 to 83 parts by weight.
Claim 4
Dependent Claim
33 words
A thermochromic opaque/transparent 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 5
Dependent Claim
79 words
A thermochromic opaque/transparent 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: ##STR2## wherein R1 stands for H or CH 3 , R2 stands for C n H 2n+1 (4<n<11), which is a straight-chain or branched chain alkyl radical, or R1=R2=CF 3 , and X stands for a substituent which is H or CH 3 on the aromatic ring.
Claim 6
Dependent Claim
123 words
A thermochromic opaque/transparent 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 7
Dependent Claim
18 words
A laminate member, comprising a substrate bearing a laminated layer of the thermochromic opaque/transparent composition of claim 1.
Claim 8
Dependent Claim
14 words
A laminate member according to claim 6, wherein said substrate is a transparent substrate.
Claim 9
Dependent Claim
32 words
A laminate member according to claim 7, wherein said substrate is provided thereon with an undercoat layer constituting of methacrylic resin with the glass transition point at least equal to 80° C.
Claim 10
Dependent Claim
38 words
A laminate member according to claim 6, wherein the layer of the thermochromic opaque/transparent 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 11
Dependent Claim
42 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 6, whereby an object inside said article can be concealed or revealed in response to temperature variation.
Claim 12
Dependent Claim
42 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 7, whereby an object inside said article can be concealed or revealed in response to temperature variation.
Claim 13
Dependent Claim
42 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, whereby an object inside said article can be concealed or revealed in response to temperature variation.
Claim 14
Dependent Claim
42 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 9, whereby an object inside said article can be concealed or revealed in response to temperature variation.
Claim 15
Dependent Claim
18 words
A three-dimensional article according to claim 10, which is a toy, a stationary article or a teaching aid.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-12-17 | 2000-06-17 | 2000-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-12-17 | 2004-06-17 | 2004-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-12-17 | 2008-06-17 | 2008-12-17 | $7700.00 | Window Closed / Lapsed |