A process for the preparation of an aqueous slurry comprising a plurality of halogenated elastomer particles suspended therein, the process comprising at least the steps of: A) contacting an organic medium comprising i) at least one halogenated elastomer and ii) an organic diluent with an aqueous medium comprising at least one LCST compound having a cloud point of 0 to 100°C whereby an LCST compound is a compound exhibiting a lower critical solution temperature for which the cloud point is determined by at least one of the following methods: • DIN EN 1890 of September 2006, method A • DIN EN 1890 of September 2006, method C • DIN EN 1890 of September 2006, method E • DIN EN 1890 of September 2006, method A wherein the amount of compound tested is reduced from 1g per 100 ml of distilled water to 0.05 g per 100 ml of distilled water. • DIN EN 1890 of September 2006, method A wherein the amount of compound tested is reduced from 1g per 100 ml of distilled water to 0.2 g per 100 ml of distilled water. and B) removing at least partially the organic diluent to obtain the aqueous slurry comprising the halogenated elastomer particles. A) contacting an organic medium comprising i) at least one halogenated elastomer and ii) an organic diluent with an aqueous medium comprising at least one LCST compound having a cloud point of 0 to 100°C whereby an LCST compound is a compound exhibiting a lower critical solution temperature for which the cloud point is determined by at least one of the following methods: • DIN EN 1890 of September 2006, method A • DIN EN 1890 of September 2006, method C • DIN EN 1890 of September 2006, method E • DIN EN 1890 of September 2006, method A wherein the amount of compound tested is reduced from 1g per 100 ml of distilled water to 0.05 g per 100 ml of distilled water. • DIN EN 1890 of September 2006, method A wherein the amount of compound tested is reduced from 1g per 100 ml of distilled water to 0.2 g per 100 ml of distilled water. and i) at least one halogenated elastomer and ii) an organic diluent with an aqueous medium comprising at least one LCST compound having a cloud point of 0 to 100°C whereby an LCST compound is a compound exhibiting a lower critical solution temperature for which the cloud point is determined by at least one of the following methods: • DIN EN 1890 of September 2006, method A • DIN EN 1890 of September 2006, method C • DIN EN 1890 of September 2006, method E • DIN EN 1890 of September 2006, method A wherein the amount of compound tested is reduced from 1g per 100 ml of distilled water to 0.05 g per 100 ml of distilled water. • DIN EN 1890 of September 2006, method A wherein the amount of compound tested is reduced from 1g per 100 ml of distilled water to 0.2 g per 100 ml of distilled water. • DIN EN 1890 of September 2006, method A • DIN EN 1890 of September 2006, method C • DIN EN 1890 of September 2006, method E • DIN EN 1890 of September 2006, method A wherein the amount of compound tested is reduced from 1g per 100 ml of distilled water to 0.05 g per 100 ml of distilled water. • DIN EN 1890 of September 2006, method A wherein the amount of compound tested is reduced from 1g per 100 ml of distilled water to 0.2 g per 100 ml of distilled water. B) removing at least partially the organic diluent to obtain the aqueous slurry comprising the halogenated elastomer particles. <EOS>