Importance

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Abstract

A temperature-dependent color/transparency storing resin layer is composed by dispersing and fixing a mutually dissolved homogeneous composition consisting of (A) an electron-donating color-developing organic compound, (B) a compound having a phenolic hydroxyl radical, and (C) a compound selected from alcohols, esters, ketones and carboxylic acids, in vinyl chloride-vinyl acetate-copolymer matrix resin, as small particles, and capable of exhibiting reversible change in color and in transparency in response to a temperature variation with hysteresis, and selectively storing a state developed above the high trigger temperature and a state developed below the low trigger temperature in a temperature range between the high and low trigger temperatures, wherein the transparency is improved by blending vinyl chloride-vinyl acetate-vinyl alcohol copolymer and/or vinyl chloride-vinylidene chloride copolymer as an agent for improving the transparency in said matrix resin so as to regulate the transparency and to conspicuously improve the transparency especially exhibited in a temperature range above the high trigger temperature, so as to constitute a laminate member to be applied in various fields.

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First Claim