EP0138741A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Temperature-indicating sheet
Assignee: Matsumoto Kosan KK
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Filing: 1984-08-21
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Granted: —
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Expires: 2004-08-21
Abstract
Abstract The present invention provides a temperature-indicating sheet which, when exposed to temperatures higher than the prescribed temperature in temperature-control for the common low-temperature preserved goods, changes in color according to the exposure temperature and time. This object is attained by arranging one component which melts at the prescribed temperature and the other component which irreversibly changes in color in contact with said component through a membrane permeable to the both components. The sheet of the present invention comprises a component (A) which melts at the prescribed temperature, a substance (B) which changes in color in contact with the component (A) and a membrane permeable to the molten component (A), said component (A) being included in microcapsules which can be broken by outer pressure at a temperature used, and in which the component (A) and the substance (B) are arranged at the opposite sides with respect to the membrane.
Inventors
- 👤 Ichiro Takahara
- 👤 Tomoyoshi Ono
- 👤 Makoto Nakai
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 18:07
CPC Classifications
G; G01; G01K; G01K11/00; G01K11/06; G01K11/12; G01K11/16
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
84 words
A temperature-indicating sheet which contains: (i) a component (A) which melts at the prescribed temperature, (ii) a substance (B) which changes in color in contact with the component (A), and (iii)a membrane permeable to the molten component (A) , said component (A) being included in microcapsules which can be broken by outer pressure at a temperature used, and in which the component (A) and the substance (B) are adhered to the membrane through a binder at the opposite sides with respect to the membrane.
Claim 2
Dependent Claim
84 words
A temperature-indicating sheet which contains: (i) a component (A) which melts at the prescribed temperature, (ii) a substance (B) which changes in color in contact with the component (A), and (iii)a membrane permeable to the molten component (A) , said component (A) being included in microcapsules which can be broken by outer pressure at a temperature used, and in which the component (A) and the substance (B) are adhered to the membrane through a binder at the opposite sides with respect to the membrane.
Claim 3
Dependent Claim
38 words
A temperature-indicating sheet as described in Claim 1, wherein the component (A) which melts at the prescribed temperature contains a color precursor (1) and a waxy substance (2), and the substance (B) contains a color developing agent (3).
Claim 4
Dependent Claim
38 words
A temperature-indicating sheet as described in Claim 1, wherein the component (A) which melts at the prescribed temperature contains a color developing agent (3) and a waxy substance (2), and the substance (B) contains a color precursor (1).
Claim 5
Dependent Claim
48 words
. 4. A temperature-indicating sheet as described in Claim 1, wherein the substance (B) contains a colored substance produced from a color precursor (1) and a color developing agent (3), and the component (A) contains a waxy substance (2) and a component which decolors the above colored substance.
Claim 6
Dependent Claim
40 words
A temperature-indicating sheet as described in any of Claims 2 to 4, wherein the color precursor (1) is organic electron-donative color precursor and the color developing agent (3) is phenolic hydroxyl group-containing compounds, organic carboxylic acids and inorganic solid acids.
Claim 7
Dependent Claim
33 words
A temperature-indicating sheet as described in any of Claims 2 to 4, wherein the color precursor (1) is iron compounds and the color developing agent (3) is phenolic hydroxyl group-containing polyhydric hydroxy compounds.
Claim 8
Dependent Claim
51 words
A temperature-indicating sheet as described in any of Claims 2 to 4, wherein the waxy substance is selected from the group consisting of higher alcohols, polyhydric alcohols, ester, polyalkylene glycols, hydrocarbons, ethers, halogenated hydrocarbons, amines and organic carboxylic acids, all of which have a melting point of not more than 20°C.
Claim 9
Dependent Claim
32 words
A temperature-indicating sheet as described in Claim 1, wherein the film-forming component of the microcapsule is selected from the group consisting of gelatin,'alginic acid, acrylic resins, methacrylic resins, melamine and epoxy resins.
Claim 10
Dependent Claim
19 words
A temperature-indicating sheet as described in Claim 1, wherein the microcapsule has a particle diameter 1 to 300 micrometer.
Claim 11
Dependent Claim
24 words
A temperature-indicating sheet as described in Claim 1, wherein the membrane is selected from the group consisting of paper, plastic film and non-woven fabric.
Claim 12
Dependent Claim
18 words
A temperature-indicating sheet as described in Claim 10, wherein the membrane has portions which are different in thickness.
Claim 13
Dependent Claim
21 words
A temperature-indicating sheet as described in Claim 10, wherein the membrane has portions which are different in raw material constituting them.
Claim 14
Dependent Claim
25 words
A temperature-indicating sheet as described in Claim 1, wherein two or more components (A) having different melting points are used in their respective microencapsulated form.
Claim 15
Dependent Claim
25 words
A temperature-indicating sheet as described in Claim 1, wherein the binder has two or more layers which are different in component or in microcapsule/binder ratio.
Claim 16
Dependent Claim
27 words
A temperature-indicating sheet as described in Claim 1, wherein the binder is selected from the group consisting of polyvinyl acetate, vinyl acetate copolymers and acrylic ester copolymers.
Claim 17
Dependent Claim
12 words
A temperature-indicating sheet as described in Claim-1 having an additional adhesive layer.
Claim 18
Dependent Claim
35 words
A temperature-indicating sheet as described in Claim 1 which has an impermeable layer to the molten component (A) and substance (B), said component (A) and substance (B) being arranged at one side of the layer.
Claim 19
Dependent Claim
21 words
A temperature-indicating sheet as described in Claim 17, wherein an adhesive is coated onto the other side of the impermeable layer.
References Cited (Backward Citations)
No citation records indexed.
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