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An apparatus and method for continuously removing polymer from a pressurized loop olefin polymerization reactor containing a slurry of polymer particles and fluids. The slurry is continuously discharged from polymer-rich zones of the reactor and enters one or a series of non-cyclonic flash vessels,

An apparatus and method for continuously removing polymer from a pressurized loop olefin polymerization reactor containing a slurry of polymer particles and fluids. The slurry is continuously discharged from polymer-rich zones of the reactor and enters one or a series of non-cyclonic flash vessels, in which the particles separate from the fluid. The flash vessel has a conical bottom in which a minimum level of polymer is maintained for a dynamic seal between the inlet and outlet.

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An apparatus and method for continuously removing polymer from a pressurized loop olefin polymerization reactor containing a slurry of polymer particles and fluids. The slurry is continuously discharged from polymer-rich zones of the reactor and enters one or a series of non-cyclonic flash vessels,

An apparatus and method for continuously removing polymer from a pressurized loop olefin polymerization reactor containing a slurry of polymer particles and fluids. The slurry is continuously discharged from polymer-rich zones of the reactor and enters one or a series of non-cyclonic flash vessels, in which the particles separate from the fluid. The flash vessel has a conical bottom in which a minimum level of polymer is maintained for a dynamic seal between the inlet and outlet. one or more polyisocyanates, polyisocyanate homologs and/or polyisocyanate derivatives having two or more aliphatic and/or aromatic isocyanate groups; (C) from 0 to 6% by weight of a solvent component consisting of (i) at least one polyisocyanate-inert organic solvent which following the preparation of the polyurethane/polymer hybrid dispersion may remain therein or may be removed in part or in whole by distillation, and/or (ii) at least one polyisocyanate-inert reactive diluent comprising at least one polyisocyanate-inert organic compound having one or more free-radically polymerizable double bonds; (D) from 0.15 to 1.5% by weight of a neutralizing component comprising at least one organic or inorganic base, (E) from 0.1 to 1% by weight of a chain extender component comprising one or more polyamines having two or more polyisocyanate-reactive amino groups, (F) from 5 to 40% by weight of a monomer component comprising one or more monomers having one or more free-radically polymerizable double bonds, (G) from 0.01 to 1.5% by weight of a free-radical initiator component comprising of at least one lipophilic free-radical initiator and water as the remainder, obtained by first preparing in reaction stage (a) a polyurethane base dispersion by (a1) reacting components (A), (B) and (C) in the presence or absence of a catalyst, to give a polyurethane prepolymer, (a2) transferring the polyurethane prepolymer from stage (a1) to the dispersion medium, water, and neutralizing it directly or indirectly using the neutralizing component (D), and subsequently (a3) reacting the polyurethane prepolymer dispersion from stage (a2) with the chain extender component (E), which has been dissolved in fractions of the dispersion medium removed prior to the addition, and then in reaction stage (b) preparing a polyurethane/polymer hybrid dispersion by (b1) adding to the polyurethane base dispersion from stage (a3) a preprepared mixture of components (F) and (G), and subsequently (b2) by means of the thermal decomposition of component (G), conducting a free-radical polymerization of component (F) within the micelles of the polyurethane base dispersion. 2. The polyurethane/polymer hybrid dispersion as claimed in claim 1, wherein component (A)(i) comprises linear difunctional polyesterpolyols having a molar mass of from 1000 to 4000 daltons. 3. The polyurethane/polymer hybrid dispersion as claimed in claim 1, wherein component (A)(i) comprises difunctional polyesterpolyols based on adipic acid, 1,4-butylene glycol and ethylene glycol. 4. The polyurethane/polymer hybrid dispersion as claimed in claim 1, wherein component (A)(ii) comprises 1,4-butylene glycol. 5. The polyurethane/polymer hybrid dispersion as claimed in claim 1 wherein component (A)(ii) comprises 1,4-butylene glycol in combination with trimethylolpropane. 6. The polyurethane/polymer hybrid dispersion as claimed in claim 1 wherein component (A)(iii) comprises a bishydroxyalkanecarboxylic acid. 7. The polyurethane/polymer hybrid dispersion as claimed in claim 6, wherein component (A)(iii) comprises dimethylolpropanoic acid. 8. The polyurethane/polymer hybrid dispersion as claimed in claim 1 wherein component (B) comprises isophorone diisocyanate. 9. The polyurethane/polymer hybrid dispersion as claimed in claim 1 wherein solvent component (C)(i) comprises high-boiling and hydrophilic compounds. 10. The polyurethane/polymer hybrid dispersion as claimed in claim 1, wherein solvent component (C)(i) comprises N-methylpyrrolidone. 11. The polyurethane/polymer hybrid dispersion as claimed in claim 1, wherein polyisocyanate-inert reactive diluent (C)(ii) comprises polyethylene glycols having one or more free-radically polymerizable double bonds. 12. The polyurethane/polymer hybrid dispersion as claimed in claim 11, wherein solvent component (C)(ii) comprises methoxypolyethylene glycol methacrylates having from 2 to 20 ethylene glycol units. 13. The polyurethane/polymer hybrid dispe