Record receiver having plural interactive leaves or a colorless – Having a colorless color-former – developer therefor – or... – Spatial relationship specified between color-former and...
Reexamination Certificate
1998-11-02
2001-05-08
Hess, Bruce H. (Department: 1774)
Record receiver having plural interactive leaves or a colorless
Having a colorless color-former, developer therefor, or...
Spatial relationship specified between color-former and...
C503S201000, C503S206000, C503S215000
Reexamination Certificate
active
06228804
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to color-change materials. More particularly, this invention relates to color-change materials whose appearances change from their ordinary ones upon application of heat and/or a medium such as water.
2. Description of the Related Art
Thermochromic articles obtained by processing reversibly thermochromic materials have conventionally been used extensively in the fields of toys, ornaments, etc. On the other hand, converted papers are known which have a porous layer containing a low-refractive-index pigment and which, upon liquid absorption, becomes transparent and develops a colored image not seen in their ordinary state (see, for example, Unexamined Japanese Patent Publication No. Sho. 50-5097).
SUMMARY OF THE INVENTION
It is an object to provide color-change materials which employ a reversibly thermochromic material and a low-refractive-index pigment in combination and produce, due to the combined use of these, a multiple effect not attainable by materials comprising either the reversibly thermochromic material or the pigment, and which are intended to be used in applications in the fields of toys and ornaments.
According to the present invention, a color-change material comprises a reversibly thermochromic layer and a porous layer containing a low-refractive-index pigment; wherein the color-change material changes its color in response to heat or water.
According to the present invention, a color-change material comprises a substrate and formed thereon a color-changing porous layer which comprises a reversibly thermochromic material, a low-refractive-index pigment, and a binder, the reversibly thermochromic material and the pigment being dispersed in the binder and tenaciously adherent thereto.
These color-change materials can effectively exhibit a variety of color changes based on a combination of the function of thermally changing their colors with changing temperature in an ambient-temperature range and the function of changing the degree of transparency between a transparent state and an opaque state upon application of a medium, e.g., water. Since these changes in appearance can be reversibly reproduced repeatedly, the color-change materials can be used in applications in the fields of toys, designs, fashion, ornaments, etc.
REFERENCES:
patent: 4028118 (1977-06-01), Nakasuji et al.
patent: 4720301 (1988-01-01), Kito et al.
patent: 4732810 (1988-03-01), Kito et al.
patent: 4810562 (1989-03-01), Okawa et al.
patent: 4925727 (1990-05-01), Brown et al.
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patent: 0 595 577 A2 (1994-05-01), None
patent: 0 665 119 A1 (1995-08-01), None
patent: 50-5097 (1975-02-01), None
Database WPI, Section Ch, Week 9019, Derwent Publications Ltd., London, GB. Abstract No. XP002110362 (JP 02-086659, (Nippon Oil Seal Ind. Co. Ltd.), Mar. 27, 1990).
Database WPI, Section Ch, Week 9635, Derwent Publications Ltd., London, GB. Abstract No. XP002110363 (JP 06-319987 (Rokusaki T), Nov. 22, 1994).
Patent Abstracts of Japan, vol. 014, No. 261, Jun. 6, 1990, (JP 02-074688 A, (Matsumoto Yushi Seiyaku Co., Ltd.) Mar. 14, 1990).
Hess Bruce H.
Sughrue Mion Zinn Macpeak & Seas, PLLC
The Pilot Ink Co., Ltd.
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