Colourants encapsulated in a polymer matrix

C - Chemistry – Metallurgy – 08 – L

Patent

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Details

C08L 25/14 (2006.01) A61K 8/81 (2006.01) C08J 3/20 (2006.01) C09B 67/08 (2006.01)

Patent

CA 2444715

Polymeric particles comprising a polymeric matrix and colourant distributed throughout the matrix, wherein the polymeric matrix that has been formed from a blend of monomers comprising a first monomer which is an ethylenically unsaturated ionic monomer and a second monomer which is an ethylenically unsaturated hydrophobic monomer which is capable of forming a homopolymer of glass transition temperature in excess of 50 ~C, and in which the first monomer is a salt of a volatile counterion component, characterised in that the polymeric matrix is impermeable to the colourant. The particles obtainable by the process of the invention can be used in a variety of industrial processes, for instance in the manufacture of inks, paper and cosmetics.

La présente invention concerne des particules de polymères comprenant une matrice polymère et un colorant distribué dans la matrice, ladite matrice polymère ayant été formée à partir d'un mélange de monomères comprenant un premier monomère qui est un monomère ionique non saturé par l'éthylène et un deuxième monomère qui est un monomère hydrophobe non saturé par l'éthylène, capable de former un homopolymère à température de transition vitreuse supérieure à 50 ·C, ledit premier monomère étant un sel d'un constituant de contre-ion volatil, ladite matrice polymère se caractérisant par le fait qu'elle est imperméable au colorant. Les particules qu'on peut obtenir à l'aide du procédé selon l'invention peuvent être utilisées dans divers procédés industriels, par exemple dans la fabrication d'encres, de papier et de cosmétiques.

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