Patent · US Expired

Process for continuously removing monomers from an aqueous dispersion of a polymer

US4171427A · kind A · utility

7Cited by

6References

10Claims

0Family size

Assignee

Hoechst GmbH · DE

Inventors

Alexander Ohorodnik · Lechenich, DE
Karl Kaiser · Long Beach, US
Rudolf Wesselmann · Lechenich, DE

Key dates

Filing date	Oct 6, 1977
Grant date	Oct 16, 1979
Priority date	—
Expiry date	Oct 6, 1997

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08F6/003
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

Monomeric matter is removed from an aqueous dispersion of a polymer containing at least 50 weight % of polymerized vinyl chloride. To this end, the dispersion is introduced into the upper portion of a column provided with sieve plates and contacted therein for 10 seconds up to 20 minutes, under 600 up to 1200 mm Hg, with hot steam at 100.degree. up to 150.degree. C. flowing countercurrently with respect to the dispersion. The polymer dispersion so treated is removed from the column base portion; and a vaporous matter mixture issuing at the head of the column is condensed stagewise so as to recover an aqueous phase and the monomeric matter.

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