Polymer particles containing active agents

A - Human Necessities – 61 – K

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Details

A61K 47/32 (2006.01) A61K 47/48 (2006.01) C08F 220/12 (2006.01)

Patent

CA 2558853

The invention relates to polymer particles containing active agents, comprising a vinyl polymer of 10- 80 wt. % of monomers comprising amino and/or carboxyl groups, insoluble in a part of the pH range from 0- 10 and soluble in another part range, characterised in that said polymer particles, containing active agents, comprise 3- 1000 parts of active agent per part of vinyl polymer, with a particle size in the range 20nm - 8m and the vinyl polymer is made up of > 50 wt. % of polymers with a molecular weight of < 100,000 Daltons.

L'invention concerne des particules polymères contenant des agents actifs, lesquelles particules comprennent un polymère vinylique constitué de 10 à 80 % en poids de monomères à groupes amino et/ou carboxyle, lequel polymère est insoluble dans une partie de la plage de pH de 0 à 10 et soluble dans une autre plage partielle. L'invention se caractérise en ce que ces particules polymères contenant des agents actifs comprennent 3 à 1 000 parties d'agent actif par partie de polymère vinylique, présentent une dimension de particules dans la plage de 20 nm à 8 ?m et le polymère vinylique est constitué à > 50 % en poids de polymères de poids moléculaire < 100 000 daltons.

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