Chemical process

Details Chemical process Chemical process

2006-06-21

2009-08-18

Woodward, Ana L (Department: 1796)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

C210S634000, C210S639000, C525S420000, C525S430000

Reexamination Certificate

active

07576162

ABSTRACT:
The invention relates to a process for the production of a nitrogen containing epihalohydrin polymer involving reaction of a nitrogen-containing precursor selected from the group consisting of amines, poly-amines, polyaminoamides, polyurethanes and mixtures thereof with epihalohydrin to form of a solution of said epihalohydrin polymer, the process comprising a purification step to remove organic impurities from the formed solution of the epihalohydrin polymer, said purification step comprising contacting the solution of the epihalohydrin polymer with a fluid under liquid, supercritical or near supercritical conditions to effect extraction of organic impurities from the solution of the epihalohydrin polymer to the fluid, withdrawing fluid enriched in organic impurities from the solution of the epihalohydrin polymer, and separating extracted impurities from the withdrawn fluid, wherein the fluid comprises a substance that at atmospheric pressure and room temperature (about 25° C.) is gaseous. The invention also relates to a process for purifying a solution of a nitrogen containing epihalohydrin polymer.

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English language abstract abstracting CN 1350795A, May 29, 2002.

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