PURIFICATION, IMPREGNATION AND FOAMING OF POLYMER PARTICLES WITH CARBON DIOXIDE

Foamed polymer moldings which have reduced levels of low molecular weight materials and which may also be substantially free of residual blowing agent or halogenated hydrocarbons are obtained by continuously extracting polymer particles in a pressure vessel with a fluid at liquid or supercritical co...

Full description

Saved in:
Bibliographic Details
Main Authors BERNARD H. MEYER, JOSEPH C. KINSLOW
Format Patent
LanguageEnglish
Published 11.03.1993
Subjects
AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G
CHEMISTRY
COMPOSITIONS BASED THEREON
GENERAL PROCESSES OF COMPOUNDING
MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS
METALLURGY
ORGANIC MACROMOLECULAR COMPOUNDS
THEIR PREPARATION OR CHEMICAL WORKING-UP
WORKING-UP
Online AccessGet full text

Cover

More Information
Summary:Foamed polymer moldings which have reduced levels of low molecular weight materials and which may also be substantially free of residual blowing agent or halogenated hydrocarbons are obtained by continuously extracting polymer particles in a pressure vessel with a fluid at liquid or supercritical conditions to remove low molecular weight compounds while impregnating said particles with the extracting fluid; pre-expanding the purified, impregnated polymer particles recovered from the pressure vessel and molding the pre-expanded particles. In a preferred embodiment, the pre-expanded particles are reimpregnated with a pneumatogen such as solid CO2, air or nitrogen, prior to molding.
Bibliography:Application Number: AU19910080133