Thermochromic ink composition
AssigneeFasver
InventorsEric Philippe, Laurence Bes
Life of this patent
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Abstract
A thermochromic ink composition includes, in a liquid medium, known as solvent, a dispersion of thermochromic microcapsules incorporating at least one leuco-dye and a thermoplastic binder selected from the group containing polyacrylic polyesters, polyurethanes and copolymers thereof. The composition is characterized in that the solvent is aprotic. A a method for producing a card and such a card incorporating at least one thermochromic pattern produced with a thermochromic ink composition are also described.
Claims22
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.
A method for producing a card of thermoplastic material comprising at least one step of hot lamination under pressure of a plurality of layers of thermoplastic material,
- wherein, before the at least one step of hot lamination under pressure, at least one thermochromic motif is printed on at least one layer of thermoplastic material using a thermochromic ink composition comprising in a liquid solvent said solvent being aprotic:
- 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.
A card comprising a plurality of superposed layers of at least one thermoplastic material comprising at least one thermochromic motif formed by printing an ink composition comprising in a liquid solvent said solvent being aprotic:
- 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.
Dependencies are inferred from the claim text.