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US 10,703,865 B2Granted
Highly pure halogenated rubbers
AssigneeArlanxeo Singapore Pte. Ltd.
InventorsGilles Joseph Arsenault, David Thompson, Clinton Lund
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Abstract
The invention relates to a method to reduce or prevent agglomeration of particles of halogenated rubbers in aqueous media by LCST compounds as well as highly pure halogenated rubbers. The invention further relates to halogenated elastomer products comprising the same or derived therefrom.
Claims19
A process for the preparation of an aqueous slurry comprising a dispersion of halogenated elastomer particles, the process comprising:
- A) contacting an organic medium comprising:
- i) at least one of a halogenated elastomer, and
- ii) an organic diluent
- with an aqueous medium comprising at least one lower critical solution temperature (LCST) compound in the amount of 1 to 5,000 ppm measured with respect to the amount of the halogenated elastomer, the LCST compound having a cloud point of 0 to 100° C. to produce a mixture of dispersed halogenated elastomer particles and LCST compound;
- wherein the mixture has a temperature of about 50° C. to about 100° C.;
- and
- B) removing at least partially the organic diluent from the mixture to obtain an aqueous slurry comprising a dispersion of the halogenated elastomer particles and LCST compound.
4 more elements
Halogenated elastomer particles and halogenated elastomer products comprising:
- 97.5 wt.-% or more of a halogenated elastomer and having an ash content measured according to ASTM D5687 of 0.25 wt. % or less;
- and
- at least one lower critical solution temperature (LCST) compound in the amount of 1 to 5,000 ppm measured with respect to the amount of the halogenated elastomer.
Dependencies are inferred from the claim text.