B - Operations – Transporting – 01 – J
Patent
B - Operations, Transporting
01
J
B01J 13/02 (2006.01) B41M 5/165 (2006.01)
Patent
CA 2501377
The invention relates to a method for encapsulating a solution, which consists of color reaction partners of color reaction systems while being provided in an aqueous emulsion, by using conventional microencapsulation methods. According to the invention, the color reaction partner is firstly dissolved in a solvent, and a nonsolvent that, at most, slightly dissolves the color reaction partner is admixed with rapid mixing to the solution obtained in the aforementioned manner. The nonsolvent is admixed in an amount that results in a supersaturated solution. The supersaturated solution is immediately emulsified with rapid mixing in the aqueous phase, and the encapsulation is carried out immediately afterwards. A vegetable oil C1-C8 alkyl ester is used in the solvent. This method exhibits both economic and technological advantages while enabling the production of microcapsules having an advantageously tight monomodal particle distribution that leads to an improved print rate.
L'invention concerne un procédé permettant d'encapsuler une solution de partenaires de réaction de chrominance, présente sous forme d'émulsion aqueuse, à l'aide de procédés de micro-encapsulation classiques. Le partenaire de réaction de chrominance est d'abord dissous dans un solvant et un non-solvant qui ne dissout le partenaire de réaction de chrominance que de manière peu significative est adjoint par mélange rapide à la solution obtenue, dans une quantité donnant lieu à une solution sursaturée. Ladite solution sursaturée est émulsifiée directement par mélange rapide dans la phase aqueuse et l'encapsulage intervient immédiatement après. Une huile végétale alkylester C¿1?-C¿8? est utilisée dans le solvant. Ce procédé présente des avantages économiques et technologiques et permet de produire des microcapsules à répartition particulaire monomodale avantageusement étroite, ce qui induit une meilleure capacité de graphie.
Papierfabrik August Koehler Ag
Robic
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