Thermochromic coloring color-memory footwear

A thermochromic coloring color-memory footwear, in which a thermochromic coloring color-memory layer having a thickness in the range of 3 to 400 .mu.m is disposed on a surface of said footwear, said thermochromic coloring color-memory layer including a quasi-reversible thermochromic coloring material showing interchangeability between a first color phase and a second color phase and having a two-phase holding temperature range in normal temperature where both said first and second color phase coexist;

• wherein said thermochromic coloring color-memory layer is formed by fixing microcapsule pigments having a particle size of 0.5 to 50 .mu.m in a binder in dispersed state, the microcapsule enclosing said quasi-reversible thermochromic coloring material, the amount of said microcapsule pigments being in the range of 1 to 40 wt % based on the total amount of said thermochromic coloring color-memory layer;
• wherein a coated layer containing photo-shielding pigments and/or a photo-stabilizer is formed as an upper layer of said thermochromic coloring color-memory layer;
• wherein when the temperature of said thermochromic coloring material is rising and the quasi-reversible thermochromic coloring material is in said first color phase, said quasi-reversible thermochromic coloring material starts to change its color from said first color phase when the temperature reaches a third temperature and turns into said second color phase completely in a temperature range not lower than a fourth temperature which is higher than said third temperature;
• and when the temperature is coming down and the quasi-reversible thermochromic coloring material is in said second color phase, the quasi-reversible thermochromic coloring material starts to change its color from said second color phase when the temperature reaches a second temperature which is lower than said third temperature and turns into said first color phase completely in a temperature not higher than a first temperature which is lower than said second temperature, said quasi-reversible thermochromic coloring material showing a hysteresis characteristic such that both said first color phase and said second color phase can coexist in a temperature range between said second temperature and said third temperature;
• wherein said first temperature is in the range of -20.degree. C. to 15.degree. C., said fourth temperature is in the range of 27.degree. C. to 70.degree. C., and a temperature range between said second temperature and said third temperature is a temperature range between 10.degree. C. and 35.degree. C.;
• and
• wherein said quasi-reversible thermochromic coloring material comprises (A) an electron-donating chromatic organic compound, (B) a compound selected from the group consisting of phenolic compounds, metal salts of phenolic compounds, aromatic carboxylic acids, aliphatic carboxylic acids having from 2 to 5 carbon atoms, metal salts of carboxylic acids, acidic phosphoric esters, metal salts of acidic phosphoric esters, and 1,2,3-triazole compounds, and (C) one or more of ester compounds having delta T value (melting point--clouding point=delta T) in the range from not lower than 5.degree. C. to not higher than 50.degree. C.