Reversible thermochromic composition having improved light-fastness and product comprising same

A reversible thermochromic composition, which comprises

• (a) an electron donating compound,
• (b) an electron accepting compound having ultraviolet absorbing capacity which is represented by the following general formula I:
• wherein X represents —CnH2n+1 or —OCmH2m+1;
• m represents an integer of from 1 to 9;
• n represents an integer of from 1 to 10;
• and p represents an integer of from 1 to 3,
• (c) a discoloration temperature adjustor, and
• (d) an electron accepting light-fastness providing agent represented by the following general formula II:
• wherein n represents an integer of from 5 to 17 (straight-chain and branched);
• X represents a C1-C4 straight-chain or branched hydrocarbon or halogen;
• Y represents a C1-C4 straight-chain or branched hydrocarbon or halogen;
• p represents an integer of from 0 to 3;
• and m represents an integer of from 0 to 3.

A reversible thermochromic composition, which comprises

• (a) an electron donating compound,
• (b) an electron accepting compound having ultraviolet absorbing capacity represented by the following general formula I:
• wherein X represents —CnH2n+1 or —OCmH2m+1;
• m represents an integer of from 1 to 9;
• n represents an integer of from 1 to 10;
• and p represents an integer of from 1 to 3,
• (c) a discoloration temperature adjustor,
• (d) an electron accepting light-fastness providing agent represented by the following general formula II:
• wherein n represents an integer of from 5 to 17 (straight-chain and branched);
• X represents a C1-C4 straight-chain or branched hydrocarbon or halogen;
• Y represents a C1-C4 straight-chain or branched hydrocarbon or halogen;
• p represents an integer of from 0 to 3;
• and m represents an integer of from 0 to 3, and
• (e) a light stabilizer.