Eastman Chemical Company

Lavonna Suzanne Buehrig

Michael Eugene Donelson

Louis Thomas Germinario

Steven Lee Stafford

Eric Jon Moskala

Marcus David Shelby

Benjamin Bradford Gamble

Steven Matthew Scheffer

Fabian Clarke Pike

Darrin James Nicholson

Maurice Harold Hodgson

Jeff Erich Neff

Terrill M McGee

David Paul Fischer

Gary Wayne Minnick

Polyester containers having a reduced coefficient of friction ('COF') are produced by increasing the surface roughness of the polyester using either thermal crystallization or solvent crystallization. Because the low COF reduces or eliminates friction between polyester containers, the containers do not become entangled and disrupt the manufacturing process. As a result, the containers move easily through typical conveying and filling lines in manufacturing processes that use the containers.

Polyester containers having a reduced coefficient of friction

A method for reducing or eliminating plate-out during the process used to produce stretch blow molded containers from polyester preforms by crystallizing the low molecular weight polyester molecules in or on the preform exterior surface before stretch blow molding the preform into a container. The molecules are crystallized using a crystallization process selected from (1) treating the outer surface of the preform with a solvent that is capable of crystallizing low molecular weight polyester molecules in polyester or (2) heating the outer surface of the preform to a temperature and for a time suitable for crystallizing low molecular weight polyester molecules in polyester. Plate-out is reduced because the crystallized molecules do not migrate out of the preform and form plate-out deposits on the mold.

Method for reducing plate-out in a stretch blow molded container

A process for coinjection-molding a multilayer article comprising coinjecting at a selected coinjecting temperature (i) a first outer polymer resin layer having a viscosity at the selected coinjecting temperature, and (ii) a second inner polymer resin layer having a viscosity at the selected coinjecting temperature, wherein the ratio of the outer polymer resin viscosity to the inner polymer resin viscosity at the coinjecting temperature is less than or equal to about 2 and the coinjecting temperature is above the melting temperature of the highest melting resin and below the degradation temperature of the lowest degrading resin to form a multilayer article. Processes for coextrusion are also provided.

Process for forming a multilayer, coinjected article

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Kingsport, TN, United States of America

Lavonna Suzanne Buehrig