Extrusion crystallization of an olefin polymer
AssigneeBP Corporation North America Inc.
InventorMichael Wreschinsky
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Abstract
A method to melt process a thermoplastic, partially-crystalline, olefin polymer in a multi-temperature stage extruder wherein the polymer has a broad melting temperature range comprises setting the temperature profile of the extruder such that a portion of the polymer crystallizes in the extruder and passing the resulting partially-crystallized polymer through an extruder die.
Claims19
A method to melt process a thermoplastic, partially-crystalline, olefin polymer in a multi-temperature stage extruder wherein the polymer has a broad melting temperature range comprising setting the temperature profile of the extruder such that a portion of the polymer crystallizes in the extruder and passing the resulting partially-crystallized polymer through an extruder die.
A method to melt process a thermoplastic, partially-crystalline, propylene polymer in a multi-temperature stage extruder wherein the polymer has a broad melting temperature range comprising setting the temperature profile of the extruder to permit full melting of the polymer in an initial stage of the extruder followed by a cooler stage in which a portion of the polymer crystallizes in the extruder and passing the resulting partially-crystallized polymer through an extruder die.
A method to melt process an elastomeric thermoplastic, partially-crystalline, propylene polymer in a multi-temperature stage extruder wherein the polymer has a melting temperature range of 50 to 150° C., a Tm of about 75 to about 155° C. and a Tc of about 45° C. to about 120° C. comprising setting the temperature profile of the extruder to permit full melting of the polymer in an initial stage of the extruder followed by a cooler stage in which a portion of the polymer crystallizes in the extruder and passing the resulting partially-crystallized polymer through an extruder die.
Dependencies are inferred from the claim text.