Patent · US Expired

Continuous process for the removal of monomeric impurities from aqueous dispersions of homo- and copolymers of vinyl chloride

US4020032A · kind A · utility

5Cited by

1References

10Claims

0Family size

Assignee

Chemische Werke Huels Aktiengesellschaft · US

Inventors

Josef Kalka · Herten, DE
Hermann Winter · Marl, DE
Jürgen Beckmann · Johannesweg, DE

Key dates

Filing date	Aug 21, 1975
Grant date	Apr 26, 1977
Priority date	—
Expiry date	Aug 21, 1995

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08F6/16
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

A process for removing residual monomer from an emulsifier-containing aqueous dispersion of a solid vinyl chloride polymer having a surface tension of less than 60 dyne/cm., which comprises continuously admixing the polymer dispersion with steam in a fluid flow pipe under a pressure of 150-600 torr at a flow velocity of 1-20 m./sec., and passing said admixture at an exit velocity of 30-100 m./sec. horizontally into and along the walls of a degasification tank having a pressure 30-200 torr lower than the pressure in said flow pipe to evaporate residual monomer.

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