Patent ID: 9493618
Filing Date: 2016-11-15
CPC Classification: C08G,C08J,C08L,C09D,Y10T

Claim Text:
1. A composition comprising a dispersion of polymer microparticles in organic liquid, wherein the dispersion is obtained by a process comprising the steps of i) providing a mixture comprising a first polymer having functional groups capable of reacting with the carboxylic acid and/or carboxylic acid anhydride groups of a second, polypropylene polymer ii) causing the polymers to melt at a chosen temperature under conditions of high shear to form an intimate mixture iii) causing the carboxylic acid and/or carboxylic acid anhydride groups of the polypropylene polymer to react with at least some of the functional groups of the first polymer, under conditions of high shear iv) diluting the resulting mixture of step iii) with an organic liquid at a temperature such that a substantially homogeneous solution is formed v) cooling the solution to a temperature whereby the polymer microparticles of the dispersion are formed, wherein the microparticles are free of butene polymer, and wherein the microparticles have a core-shell structure with the core being composed predominantly of the second, polypropylene polymer, and the shell being composed predominantly of a dispersant formed by the reaction of the first polymer with the carboxylic acid or carboxylic acid anhydride groups the second polypropylene polymer.