Patent ID: 9744789
Date: 2017-08-29
CPC Classifications: B41M,B42D,C09D,D21H

Claim:
1. A thermochromic ink composition comprising in a liquid solvent: a dispersion of thermochromic microcapsules incorporating at least one leuco dye, and a thermoplastic binder chosen from the group formed of polyacrylic polyesters, polyurethanes, and copolymers thereof, wherein said solvent is aprotic and comprises at least one compound chosen from the group formed of n-alkyl propanoates, propylene glycols, 1-methoxy-2-propyl acetate, 1-propoxy-2-propanol, 1-propoxy-2-propyl acetate, 1-butoxy-2-propanol, 1-(2-methoxy-1-methylethoxy)-2-propanol, 1-(2-methoxy-1-methylethoxy)-2-propyl acetate, 1-(2-propoxy-1-methylethoxy)-2-propanol and [2-(2-methoxymethyl-ethoxy)methylethoxy]-2-propanol.