National Distillers and Chemical Corporation

Claude J Stiles

Daniel Tomo

Charles R Donaldson

Byford P Hancock

Ethylene is polymerized in a dual reactor system in which two reactors are connected in series with a heat exchanger, or intercooler, disposed therebetween. The reaction stream from the first reactor at elevated pressure and temperature is passed through the heat exchanger to effect cooling of the stream. Following passage through the heat exchanger, the pressure of the cooled reaction stream is reduced through a pressure let-down valve and the stream is thereafter introduced into the second reactor wherein further polymerization takes place. The reactors can both be of the autoclave type although one of the reactors can be of the tubular variety.

Dual reactor process and apparatus for polymerizing ethylene

Dual reactor apparatus for polymerizing ethylene

A method of producing a lightweight, strong, uniform, foamed layer containing tubular film with good opacity which can be heat-shrunk onto an annular substrate such as a glass bottle rapidly and uniformly is accomplished by co-extruding a low density polyethylene and a mixture of an ethylene polymer and a blowing agent under particular conditions and causing the blowing agent to decompose thereby foaming the ethylene polymer.

Plastic skin envelopes for glass bottles and the like

The melt index of ethylene-vinyl acetate copolymers is decreased by mechanically working the preformed copolymers.

Low melt index ethylene-vinyl acetate copolymers

Ethylene/vinyl acetate/isobutylene terpolymers illustrating increased melt indices in combination with lower stiffness and Vicat softening temperatures are superior hot melt coating resins.

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Tuscola, IL, United States of America

Claude J Stiles