Patent · US Expired

Method for isolating ionomers in the salt form

US4511712A · kind A · utility

8Cited by
2References
20Claims
0Family size

Assignee

Inventor

Key dates

Filing dateFeb 21, 1984
Grant dateApr 16, 1985
Priority date—
Expiry dateFeb 21, 2004

Classification

  • Technology area (CPC C)Chemistry; Metallurgy
  • CPC primaryC08F6/12
  • WIPO fieldMacromolecular chemistry, polymers
  • WIPO sectorChemistry

Abstract

Ionomers such as sulfonated polystyrenes are isolated from solutions in organic solvents (e.g., methylene chloride) in the salt form (usually the ammonium or amine salt form) by blending the ionomer solution with a solution of a salt in an organic liquid which is substantially a non-solvent for said ionomer. The salt is one in which the counterion is identical to that of the ionomer or below it in the ion affinity sequence, and is preferably an ammonium salt, especially ammonium chloride. The preferred organic liquid is methanol. The method enables recovery of the precipitated ionomer in finely divided, granular form rather than in colloidal condition.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.