CA Patent

CA2601236A1 — An improved process for the preparation of crosslinked polyallylamine polymer

Assigned to USV Pvt Ltd · Expires 2006-09-21 · 20y expired

What this patent protects

The present invention provides a process for crosslinking of polyallylamine hydrochloride wherein an aqueous solution of polyallylamine hydrochloride is partly neutralized with alkali and epichlorohydrin is added. The aqueous solution is dispersed in an organic medium containing …

USPTO Abstract

The present invention provides a process for crosslinking of polyallylamine hydrochloride wherein an aqueous solution of polyallylamine hydrochloride is partly neutralized with alkali and epichlorohydrin is added. The aqueous solution is dispersed in an organic medium containing a surfactant. This leads to gelation in individual droplets. The crosslinking in individual gel beads is completed by raising the temperature. The resulting beads are then separated, washed with water, treated with an organic solvent and dried. The method maximizes the yield of crosslinked polyallylamine hydrochloride particles in the range 60 - 100 mesh.

Drugs covered by this patent

Patent Metadata

Patent number
CA2601236A1
Jurisdiction
CA
Classification
—
Expires
2006-09-21
Drug substance claim
No
Drug product claim
No
Assignee
USV Pvt Ltd
Source
FDA Orange Book + USPTO grounding via Google Patents

Bibliographic data sourced from FDA Orange Book + USPTO public records. Plain-English summary generated by AI grounded in source text. Patent term extensions (PTR, SPC, pediatric) may shift the effective expiry. Not legal advice.

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