| 摘要 |
PROBLEM TO BE SOLVED: To provide a lightfast, thermally color-changing composition obtained by fixing a thermally color-changing pigment onto a resin in a state of dispersion so that the light fastness of a thermally color-changing resin layer formed by printing, coating or similar treatment of the composition can be remarkably improved. SOLUTION: This lightfast, thermally color-changing composition is obtained by fixing a thermally color-changing pigment with an average particle size of 0.5-30μm in a state of dispersion, onto a resin having an oxygen gas barrier property selected from the group consisting of polyvinyl alcohol, a copolymer having≥50% of an polyvinyl alcohol component, a polycarboxylic acid, a copolymer having≥50% of a polycarboxylic acid and an ammonium salt or monovalent metal salt thereof, a copolymer having≥50% of an acrylonitrile component, a monosaccharide and a polysaccharide. The resin having an oxygen gas barrier is formed as a continuous layer to cover the outer surface of the thermally color-changing pigment. COPYRIGHT: (C)2003,JPO
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