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AssigneePENTAX Corporation
InventorsYukio Kubota, Minoru Suzuki, Kazuyuki Shimbo, Yutaka Igari
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A first heat-sensitive microcapsule of the present invention comprises a shell wall and a liquid coloring composition, and has such a temperature-breaking characteristic that the shell wall is broken by heating to a temperature equal to or higher than a boiling point of the liquid coloring composition. The first heat-sensitive microcapsule is stable to light and easy to handle. A second heat-sensitive microcapsule of the present invention comprises a shell wall, a coloring composition and a heat decomposition-type gas-developing agent, and has such a temperature-breaking characteristic that the shell wall is broken by heating to a temperature equal to or higher than a decomposition temperature of the gas-developing agent. The second heat-sensitive microcapsule can be sensitively broken even by heating in a short time. A heat-sensitive recording medium comprising the first or second heat-sensitive microcapsule provides substantially no waste products after recording, is easy to handle, and capable of economically recording an image with ease.
A heat-sensitive microcapsule comprising a shell wall and a liquid coloring composition enclosed in said shell wall, wherein said heat-sensitive microcapsule has such a temperature-breaking characteristic that said shell wall is broken by heating to a temperature equal to or higher than a boiling point of said liquid coloring composition to release said liquid coloring composition.
A pressure-sensitive, heat-sensitive recording medium comprising a substrate coated with a microcapsule layer, wherein
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