Title:
TIME INDICATOR
Document Type and Number:
Japanese Patent JP3282298
Kind Code:
B2
Abstract:
PURPOSE: To realize an indicator attachable to products of wide usage by overlaying a layer including electron-donating coloring organic compounds with a specific distribution coefficient and a layer having electron acceptance.
CONSTITUTION: When layer A and layer B made of a thermal plastic resin (for example; olefin resin) or an adhesive (for example; latex adhesive) are overlayed, layer A in colorless state containing electron-donating coloring organic compound with a distribution coefficient between the two layers of 0.1 or more and layer B in colorless state having electron acceptance are overlayed. As a result, the coloring of B layer B becomes stronger with time and thus an indicator capable of indicating the elapsed time after overlaying the two layers can be obtained. It is also, possible to lay a barrier not permeable to the electron donating coloring organic compound on the outer surfaces of the overlayed A layer A and layer B or to cover the both layers with the barrier layer. As for the electron-donating coloring organic compound, such compounds as rhodaminelactams and fluorans are usable.
Inventors:
Takashi Sennuki
Seiichi Shibata
Tatsuhiro Nagamatsu
Seiichi Shibata
Tatsuhiro Nagamatsu
Application Number:
JP17053093A
Publication Date:
May 13, 2002
Filing Date:
July 09, 1993
Export Citation:
Assignee:
Sumitomo Chemical Co., Ltd.
International Classes:
C09K3/00; G04F1/00; G04F1/02; G04F13/00; (IPC1-7): G04F1/00
Domestic Patent References:
| JP62235562A | ||||
| JP1150883A | ||||
| JP4505213A | ||||
| JP6501770A |
Attorney, Agent or Firm:
Takashi Kuboyama (1 person outside)
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