Alliedsignal Inc.

Allied Corporation

Allied Chemical Corporation

Edward J Buyalos

Hugh H Rowan

David Pendlebury

James G Neal

David W Millure

Beryl A Boggs

Steven A Young

Laszlo J Balint

Clarence McKeithan, Jr

Neil F Blake

Patrick William Ager

Lon K Bouknight

A method to recycle spent ethylene glycol in a continuous process for the manufacture of polyethylene terephthalate in at least one reactor vessel which includes:

Method to recycle spent ethylene glycol

High strength polyester multifilament yarn of improved dimensional stability, which has the proper combination of an intrinsic viscosity of at least 0.90, relatively low work loss and a high degree of toughness, is incorporated as tire cord into a rubber tire for reinforcement to provide an important improvement in fatigue life and retained fatigue strength. The continuous melt-spin process comprises the steps of feeding prepolymer to a first finisher vessel to achieve at least 0.4 intrinsic viscosity transferring polymer to a second finisher vessel for a period sufficient to achieve an intrinsic viscosity of at least 0.95, and supplying this polymer to an extrusion spinnerette.

High strength polyester yarn for improved fatigue resistance

Process for producing high strength polyester yarn for improved fatigue

In a reactor, for the continuous polymerization of feed materials to higher viscosity process fluid, comprising a vertical, hollow vessel having an inlet for the introduction of feed materials, an outlet for the discharge of process product and an exhaust for reaction vapors; and means for heating the vessel; the improvement comprising a draft tube, partially immersed vertically in the process fluid, the non-immersed end of the tube having at least one annular plate on the periphery thereof which overhangs the process fluid; and an impeller, located within the draft tube and propelling the process fluid up the draft tube and over the plate.

Reactor

This invention is an improved process to remove volatiles from molten synthetic, preferably fiber forming relatively high viscosity polymers which comprises passing molten polymer through a rotary disk polymer processor at a temperature of between 260.degree. C. and 300.degree. C. at a rate of between about 10 and 75 pounds (4.5 and 34 kg) per hour per square foot (0.093 m.sup.2) of processor filming area, at a rotational rate of between about 5 and 75 rpm for the disks, and a processor having between 1 and 20 stages.

Devolatilizing molten polymer with a rotary disk processor

In an essentially horizontal totally enclosed cylindrical wiped-wall polymer reactor having an essentially horizontal polymer flow, a pool of polymer in its lower portion, and driven wheels to create high surface area in the polymer to facilitate evaporation of volatiles from the polymer, the improvement comprising a freewheeling drag wheel driven by the driven wheels, with a wiping means mounted on the driven wheels and actuated by the drag wheel to wipe the entire internal circumference of the cylindrical reactor. The drag wheel generates a force to urge the wiping means outward against the internal circumference of the reactor. The force is generated by the drag of the pool of polymer on the drag wheel. This keeps the wall of the reactor wiped with a fresh film of polymer. The process and apparatus is particularly adaptable to driven wheels and drag wheels eccentrically mounted in the reactor.

Wiped-wall reactor

Growing community of inventors

Chester, VA, United States of America

Edward J Buyalos