Microcapsules having improved printing and efficiency

Details Microcapsules having improved printing and efficiency Microcapsules having improved printing and efficiency

B - Operations, Transporting

41

M

B41M 5/20 (2006.01) B01J 13/08 (2006.01) B01J 13/22 (2006.01) B32B 15/02 (2006.01) B41M 5/165 (2006.01)

Patent

CA 2447002

Dual shell microcapsule aggregate particles and copy materials coated therewith, such aggregate particles having inner shells surrounding chromogenic nucleus material, and outer shells encompassing multiple such inner shells to form aggregate particles thereof. The inner shells are derived from polar pre-polymer compositions. The outer shells are derived from complex colloids such as gelatin and gelatin derivatives. The outer shell material causes agglomeration of the inner shells into aggregate particles, thus increasing the sizes of the particles without increasing the sizes of the respective inner-shell microcapsules which contain the chromogenic material.

L'invention concerne des agrégats de particules constitués de microcapsules à double enveloppe, ainsi que des matériaux d'impression enduits avec ces agrégats. Ces agrégats de particules comprennent des enveloppes internes renfermant des noyaux chromogènes et des enveloppes externes contenant plusieurs desdites enveloppes internes, formant des agrégats de particules à partir de ces enveloppes internes. Les enveloppes internes sont obtenues à partir de compositions prépolymères polaires. Les enveloppes externes sont obtenues à partir de colloïdes complexes, tels que la gélatine ou des dérivés de la gélatine. Le matériau de l'enveloppe externe entraîne l'agglomération des enveloppes internes sous forme d'agrégats de particules, augmentant ainsi les dimensions des particules sans augmenter les dimensions des microcapsules des enveloppes internes respectives contenant la substance chromogène.

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