Highly pure halogenated rubbers

1. A slurry comprising:

a dispersion of particles of a halogenated elastomer in an aqueous medium; and

at least one lower critical solution temperature (LCST) compound having a cloud point of 0 to 100° C.;

wherein the LCST compound is present in an amount of 1 to 1,000 ppm measured with respect to an amount of the halogenated elastomer.

2. The slurry of claim 1 , wherein the slurry includes 1 to 2,000 ppm of antioxidant based on a total weight of the aqueous medium.

3. The slurry of claim 1 , wherein the halogenated elastomer comprise repeating units derived from at least one isoolefin and repeating units derived from at least one multiolefin.

4. The slurry of claim 3 , wherein the isoolefin includes an isoolefin having 4 to 16 carbon atoms, optionally wherein the isoolefin is isobutene.

5. The slurry of claim 4 , wherein the multiolefin includes isoprene, butadiene, 2-methylbutadiene, 2,4-dimethylbutadiene, piperyline, 3-methyl-1,3-pentadiene, 2,4-hexadiene, 2-neopentylbutadiene, 2-methyl-1,5-hexadiene, 2,5-dimethyl-2,4-hexadiene, 2-methyl-1,4-pentadiene, 4-butyl-1,3-pentadiene, 2,3-dimethyl-1,3-pentadiene, 2,3-dibutyl-1,3-pentadiene, 2-ethyl-1,3-pentadiene, 2-ethyl-1,3-butadiene, 2-methyl-1,6-heptadiene, cyclopentadiene, methylcyclopentadiene, cyclohexadiene or 1-vinyl-cyclohexadiene.

6. The slurry of claim 1 , wherein the halogenated elastomer comprises repeating units derived from isobutene and repeating units derived from isoprene.

7. The slurry of claim 1 , wherein the slurry comprises at least 20 of the particles per liter, wherein the particles have a particle size of 0.05 to 25 mm.

8. The slurry of claim 7 , wherein the slurry comprises at least 100 of the particles per liter, wherein the particles have a particle size of 0.3 to 10 mm.

9. The slurry of claim 8 , wherein the LOST compound has a cloud point of 15 to 80° C.

10. The slurry of claim 9 , wherein the slurry includes an organic diluent.

11. A mixture comprising:

a dispersion of particles of a halogenated elastomer in an aqueous medium;

at least one lower critical solution temperature (LOST) compound in the aqueous medium having a cloud point of 0 to 100° C.; and

an organic diluent;

wherein the mixture has a temperature of 50° C. to 100° C.

12. The mixture of claim 11 , wherein the halogenated elastomer comprises repeating units derived from isobutene and repeating units derived from isoprene.

13. The mixture of claim 12 , wherein the LCST compound is present in an amount of 1 to 5,000 ppm measured with respect to the amount of the halogenated elastomer.

14. The mixture of claim 11 , wherein the slurry includes 1 to 2,000 ppm of antioxidant based on a total weight of the aqueous medium.

15. The mixture of claim 12 , wherein the LCST compound has a cloud point of 15 to 80° C.

16. The mixture of claim 15 , wherein the organic diluent includes one or more hydrocarbons selected from the group consisting of propane, isobutane, pentane, methycyclopentane, isohexane, 2-methylpentane, 3-methylpentane, 2-methylbutane, 2,2-dimethylbutane, 2,3-dimethylbutane, 2-methylhexane, 3-methylhexane, 3-ethylpentane, 2,2-dimethylpentane, 2,3-dimethylpentane, 2,4-dimethylpentane, 3,3-dimethyl pentane, 2-methylheptane, 3-ethylhexane, 2,5-dimethylhexane, 2,2,4,-trimethylpentane, octane, heptane, butane, ethane, methane, nonane, decane, dodecane, undecane, hexane, methyl cyclohexane, cyclopropane, cyclobutane, cyclopentane, methylcyclopentane, 1,1-dimethylcyclopentane, cis-1,2-dimethylcyclopentane, trans-1,2-dimethylcyclopentane, trans-1,3-dimethyl-cyclopentane, ethylcyclopentane, cyclohexane, and methylcyclohexane.

17. The mixture of claim 16 , wherein the organic diluent includes the hydrocarbon and a hydrochlorocarbon.

18. The mixture of claim 17 , wherein the hydrochlorocarbon includes dichloromethane.

19. A slurry comprising:

a dispersion of particles of a halogenated elastomer in an aqueous medium; and

at least one lower critical solution temperature (LOST) compound having a cloud point of 0 to 100° C.;

wherein the at least on LOST compound is selected from the group consisting of: poly(N-isopropylacrylamide), poly(N-isopropylacrylamide-co-N,N-dimethylacrylamide, poly(N-isopropylacrylamide)-alt-2-hydroxyethylmethacrylate, poly(N-vinylcaprolactam), poly(N,N-diethylacrylamide), poly[2-(dimethylamino)ethyl methacrylate], poly(2-oxazoline) glyhalogenated elastomer, poly(3-ethyl-N-vinyl-2-pyrrolidone), hydroxylbutyl chitosan, polyoxyethylene sorbitan monostearate, polyoxyethylene sorbitan monolaurate, polyoxyethylene sorbitan monooleate, methyl cellulose having a viscosity of 25 to 4000 cp (measured at 2 wt. % in water at 20° C.), hydroxypropyl cellulose, hydroxyethyl methylcellulose, hydroxypropyl methylcellulose, poly(ethylene glycol) methacrylate having 2 to 6 ethylene glycol units, polyethyleneglycol-co-polypropylene glycol, polyethyleneglycol-co-polypropylene glycol, ethoxylated iso-013H27-alcohols, polyethylene glycol having 4 to 50 ethyleneglycol units, polypropylene glycol having 4 to 30 propyleneglycol units, polyethylene glycol monomethyl ether having 4 to 50 ethyleneglycol units, polyethylene glycol dimethyl ether having 4 to 50 ethyleneglycol units, polyethylene glycol monoethyl ether having 4 to 50 ethyleneglycol units, polyethylene glycol diethyl ether having 4 to 50 ethyleneglycol units, polypropylene glycol monomethyl ether having 4 to 50 propyleneglycol units, polypropylene glycol dimethyl ether having 4 to 50 propyleneglycol units, polypropylene glycol monoethyl ether having 4 to 50 propyleneglycol units, and polypropylene glycol diethyl ether having 4 to 50 propyleneglycol units.

20. The slurry of claim 19 , wherein the LCST compound comprises a cellulose-containing compound selected from the methyl cellulose, the hydroxypropyl cellulose, the hydroxyethyl methylcellulose and the hydroxypropyl methylcellulose; wherein the cellulose-containing compound has a degree of substitution of 1.2 to 2.5.