Phillips Petroleum Company

J S Gwinn

Gary L Funk

George R Hill

Ted W Marker

Michael J Miller

A process for improving the properties of a high molecular weight hydrocarbon polymer by reducing the molecular weight thereof and thereby reducing the melt viscosity while retaining the characteristics which provide luster to fibers produced from the polymer is provided. In accordance with the process, the polymer is melted and reacted with both a free radical initiator for lowering the molecular weight and melt viscosity of the polymer by chain scission and a crosslinking agent for crosslinking shortened polymer chains.

Process for improving thermoplastic hydrocarbon polymers with

A continuous mixer with twin parallel rotors, a feed end and a discharge end is disclosed which is characterized by mismatched rotors. The apexes, or points at which the rotor tips change direction, are substantially misaligned as between the individual rotors of the pair.

Continuous mixer

In an extrusion process, desired product quality parameters are maintained very accurately by manipulating the rotational speed of the screw associated with the extrusion process so as to maintain a desired ratio of feed rate to drag flow in the extrusion process and by manipulating the feed rate of the material to the extrusion process so as to maintain a desired energy input per unit of the material being processed.

Extrusion control process and apparatus

A method for providing pellets of extrusion compounded expandable polymeric compositions by (a) introducing a blowing agent and polymeric compound into an extruder, (b) extruding a composition containing the blowing agent and polymeric compound with discharge of the extrusion underwater through a pelleter at a temperature below blowing agent activation temperature, (c) supplying a stream of water across the die face of the pelleter at a predetermined first temperature sufficient to produce pellets, (d) supplying additional transport water downstream of the pelleter to further cool the pellets to a second predetermined temperature, and (e) separating the cooled pellets from the transport water. In an additional embodiment collecting the separated pellets, conditioning the transport water to the first predetermined temperature, and recycling the transport water to the die face. In a process for extruding and transporting pellets in which an extruder discharges underwater through a pelleting device a method for controlling the temperature of the pellets in which transport water is supplied to the die plate of the pelleter at the first predetermined temperature sufficient to produce pellets and additional transport water supplied downstream of the pelleter further to cool the pellets to a predetermined second temperature. In a method for transporting pelleted material a control system that comprises sensing and operating conditions, generating a signal according to the operating condition, and diverting flow of the pelleted material in response to that signal.

Method of extruding and pelletizing expandable polymeric composition

The rigidity of a die used in pelletizing plastics is increased by connecting the rear center of the die with a support fastened to the center of the breaker plate. The die body, support, and breaker plate are attached to the extruder in an in-line manner.

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Bartlesville, OK, United States of America

J S Gwinn