Patent · US Expired

Polymer powders of low fines content and method for making the same by spray drying

US4892910A · kind A · utility

21Cited by

12References

7Claims

0Family size

Assignee

GmbH Rohm · DE

Inventors

Wolfgang Klesse · Mainz, DE
Hubert Rauch · Weiterstadt, DE
Peter J. Arndt · Seeheim-Jugenheim, DE
Norbert Suetterlin

Key dates

Filing date	Jul 13, 1988
Grant date	Jan 9, 1990
Priority date	—
Expiry date	Jul 13, 2008

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08F6/18
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

Polymer powders comprising aggregated polymer particles, said powders having a low content of fines and being suitable as processing aids in the manufacture of polyvinyl chloride, are made by spray drying an aqueous dispersion (latex) of two emulsion polymers, one of which has a dynamic glass transition temperature above 90.degree. C. and the other of which has a dynamic glass transition below 105.degree. C., the latter being at least 10 K. degrees below the former.

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