Production of foam plastics from high molecular weight olefin polymers

Abstract

Abstract THE PRODUCTION OF FOAM PLASTICS FROM OLEFIN POLYMERS OF HIGH MOLCULAR WEIGHT WHOSE X-RAY CRYSTALLINITY AT 25* C. IS MORE THAN 50% BY WEIGHT BY MIXING THE OLEFIN POLYMER AT A TEMPERATURE WHICH IS FROM 50* TO 100*C. ABOVE THE CRYSTALLITE MELTINNG POINT OF THE OLEFIN PPOLYMER AT A SHEAR RATE OF FROM 20 TO 200 SEC.-1 AT SUPERATMOSPHERIC PRESSURE WITH AN AROMATIC HYDROCARBON, HOMOGENIZING THE MIXTURE IN A ZONE AT A TEMPERATURE BETWEEN THE CRYSTALLITE MELTING POINT OF THE OLEFIN POLYMER AND A MAXIMUM OF 50*C. ABOVE THE SAME AND AT A SHEAR RATE OF FROM 500 TO 1500 SEC.-1 WITH FROM 5 TO 40% BY WEIGHT OF A HYDROCARBON AND/OR HALOHYDROCARBON AT A PRESSURE WHICH PREVENTS FORMING OF THE MIXTURE, COOLING THE RESULTANT HOMOGENEOUS GEL TO A TEMPERATURE WHICH IS FROM 10* TO 60*C. BELOW THE CRYSTALLITE MELTING POINT OF THE OLEFIN POLYMER, AND EXPRESSING THE HOMOGENEOUS GEL INTO A ZONE IN WHICH A PRESSURE PREVAILS WHICH IS BELOW THE VAPOR PRESSURE OF THE EXPANDING AGENT IN THE GEL. THE PRODUCTS ARE USED AS INSULATION MATERIALS AND PACKAGING INSERTS.

Inventors

• 👤 H Tatzel
• 👤 G Beck

Bibliographic Details