Process for the production of expanded polypropylene and end-products based on expanded polypropylene
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United States of America Patent
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Jun 3, 2003
Grant Date -
Jun 6, 2002
app pub date -
Nov 29, 2001
filing date -
Dec 4, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention relates to a process comprising the following phases: the feeding and melting of polypropylene to obtain a molten polymer; addition to the molten polymer of possible additives; mixing of the molten polymer with the additives; introduction of the expanding agent CO.sub.2 into the molten polymer; extrusion of the molten polymer, expanding agent and possible additives to produce an expanded polypropylene, wherein the polypropylene fed and melted in the first phase consists of a polypropylene which contains a quantity ranging from 15 to 25% of high melt strength polypropylene and wherein the temperature is lowered to a value of about 160.degree. C. immediately after introducing the CO.sub.2 gas into the molten polymer.
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