THERMAL CRYSTALLIZATION OF POLYESTER PELLETS IN LIQUID

WIPO Patent Application WO2005035610

A3

A process for thermally crystallizing a polyester polymer by introducing pellets into a liquid medium having a temperature of at least 140°C within a liquid medium zone and crystallizing the submerged pellets at or above the vapor pressure of the liquid medium without increasing the molecular weight of the pellets, and while the pressure on at least a portion of the pellets is equal to or greater than the vapor pressure of the liquid medium, separating at least a portion of said pellets and at least a portion of the liquid medium from each other. The crystallization is desirably conducted in the liquid medium zone without mechanically induced agitation. Optionally, the pellets are formed by an underfluid pelletizer. There is also provided a process for thermally crystallizing solid pellets in a pipe by directing a flow of solid pellets in a liquid medium through a pipe having an aspect ratio L/D of at least 50:1, wherein the solid pellets are crystallized in the pipe at a liquid medium temperature greater than the T_g of the polyester polymer.

JP2009120714	COMPOSITE RESIN PELLET, MOLDED ARTICLE AND METHOD FOR PRODUCING COMPOSITE RESIN PELLET
JPH05301218	PRODUCTION OF THERMOPLASTIC RESIN PARTICLE

JERNIGAN MARY THERESE (US)
EKART MICHAEL PAUL (US)
SAMITIER LUCIANO DALMACIO (AR)
WELLS CORY LEE (US)
WINDES LARRY CATES (US)

PCT/US2004/027438

December 28, 2006

August 24, 2004

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EASTMAN CHEM CO (US)

B29B9/06; B01J8/00; B01J8/08; B01J19/00; B01J19/24; B01J19/26; B01J19/30; B29B9/16; C08G2/00; C08G63/88; C08G

US20030109640A1	2003-06-12
US5744578A	1998-04-28
JP2003200420A	2003-07-15
US5290913A	1994-03-01

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