Method of making micro cellular foams

The prodn. micro-cellular thermoplastic foam sheet comprises: (a) impregnating a plastic melt (I) with a volatile blowing agent (II) in the supercritical state in a first extrusion zone A at a temp. above the T, of (I); (b) cooling the melt by at least 40 degrees C in a second extrusion zone B, to a...

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Bibliographic Details
Main Authors SWOBODA, JOHANN, DIETZEN, FRANZ-JOSEF, BAUMGARTL, HORST
Format Patent
LanguageEnglish
French
German
Published 26.03.2003
Edition7
Subjects
AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G
AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
CHEMISTRY
COMPOSITIONS BASED THEREON
GENERAL PROCESSES OF COMPOUNDING
METALLURGY
ORGANIC MACROMOLECULAR COMPOUNDS
PERFORMING OPERATIONS
SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR
SHAPING OR JOINING OF PLASTICS
THEIR PREPARATION OR CHEMICAL WORKING-UP
TRANSPORTING
WORKING OF PLASTICS
WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
WORKING-UP
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Summary:The prodn. micro-cellular thermoplastic foam sheet comprises: (a) impregnating a plastic melt (I) with a volatile blowing agent (II) in the supercritical state in a first extrusion zone A at a temp. above the T, of (I); (b) cooling the melt by at least 40 degrees C in a second extrusion zone B, to a temp. at least 30 degrees C above the Tg of blowing agent-free (I), and (c) expanding to normal pressure and cooling to room temp. to give expanded solid foam.
Bibliography:Application Number: EP19950116313