초록 ▼

Polymer particles possessing, implanted on their surface, amphiphilic molecules carrying ion-forming or reactive groups, and dispersions thereof, prepared by diffusing, into a previously prepared aqueous seeding dispersion of polymer particles, an organosoluble polymerization initiator, swelling the

Polymer particles possessing, implanted on their surface, amphiphilic molecules carrying ion-forming or reactive groups, and dispersions thereof, prepared by diffusing, into a previously prepared aqueous seeding dispersion of polymer particles, an organosoluble polymerization initiator, swelling the particles of the dispersion thus obtained by introducing a monomer composition comprising at least one monomer and at least one amphiphilic compound, and polymerizing the monomer composition.

대표청구항 ▼

A process for the preparation of an aqueous dispersion of polymer particles possessing, implanted on their surface, amphiphilic molecules carrying ion-forming or reactive groups, comprising the following steps: (1) diffusing, into a previously prepared aqueous seeding dispersion of polymer particles

A process for the preparation of an aqueous dispersion of polymer particles possessing, implanted on their surface, amphiphilic molecules carrying ion-forming or reactive groups, comprising the following steps: (1) diffusing, into a previously prepared aqueous seeding dispersion of polymer particles, an organosoluble polymerization initiator having a solubility in water of from about 10-3 to 10-2 g/liter of water, said diffusion being carried out at a temperature below the decomposition temperature of said initiator; (2) swelling said particles of said dispersion thus obtained by introducing a monomer composition comprising (a) at least one monomer and (b) at least one amphiphilic compound having an HLB greater than or equal to 10 and a molecular weight greater than or equal to 400, wherein the hydrophilic block of said amphiphilic compound is a hydrophilic oligomer block terminated by at least one ion-forming or reactive group, said swelling being carried out by the monomer component (a) with a quantity of monomer composition less than the maximum quantity of said composition which said seeding dispersion can absorb, at a temperature below the decomposition temperature of said initiator; and (3) polymerizing said at least one monomer of said monomer composition at a temperature at least equal to the decomposition temperature of said initiator, the nature of said seeding polymer and the nature of said at least one monomer of said monomer composition, being such that the final polymer has a glass transition temperature Tg above about 40°C., said polymerzation resulting in the implantation of said amphiphilic compound (b) of the monomer composition in the surface layer of the polymer particles.