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US 5,847,054 AGranted
Polymer particles and their preparation
AssigneeBASF SE
InventorsGraham Edmund McKee, Binnur Gunesin, Anton Ticktin
Life of this patent
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Abstract
Polymer particles are prepared by polymerizing at least one monomer in the presence of block copolymers or graft copolymers in an organic dispersant which does not dissolve the polymer to be prepared, and subjecting at least one monomer to free radical polymerization in the presence of the polymer obtained therefrom.
Claims11
A process for the preparation of polymer particles, which process comprises the following sequential steps:
- a) polymerizing styrene and a crosslinking monomer anionically in a hydrocarbon dispersant which does not dissolve the polymer to be prepared and in the presence of a styrene/butadiene or styrene/isoprene block copolymer or graft copolymer which can be partially or completely hydrogenated, to form a polymer dispersion;
- and
- b) polymerizing styrene and acrylonitrile by a free radical mechanism in the presence of the polymer dispersion obtained from step a), the polymerization in step b) being carried out once or several times.
Dependencies are inferred from the claim text.