| 摘要 |
Emulsion comprising microencapsulated thermochromic leuco colorants and method for multi-microencapsulation. Emulsion comprising 5-30 % by weight of at least one microencapsulated thermochromic leuco colorant having a polymeric coating, between 30 and 50 % by weight of a polymer, between 1 and 10 % by weight of emulsifying and preserving agents and between 30 and 60 % by weight of solvent, said thermochromic leuco colorants can be spironolactones, fluorenes or spiropyrans. Method for multi-microencapsulation of thermochromic leuco colorants, which comprises mixing microencapsulated thermochromic leuco colorants having a polymeric coating with an oil-based solution, mixing the resulting solution from the preceding step with a suspension which comprises water-based gelatin and aminoplast or a mixture of polyamides and polyureas and adding a cross-linker. |
