Method for thermally processing polyester pellets
AssigneeHosokawa Bepex Corporation
InventorsGregory J. Kimball, Ilya Pikus
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Abstract
A method for thermally processing polyester pellets by crystallization and polymerization in the solid state which comprises providing a confined processing unit. The pellets are introduced to said unit along with a liquid medium. The combination of pellets and liquid medium is agitated to achieve mixing and the temperature of the agitated mixture is controlled to achieve treating of the polyester pellets in the agitated heating liquid medium at a temperature slightly below the sticking temperature of the polyester. The treatment is continued for a period sufficient to substantially increase the crystallinity and molecular weight of the polyester.
Claims12
A method for thermally processing polyester pellets by crystallization and polymerization in the solid state which comprises providing a confined processing unit, introducing said pellets into said unit, introducing a liquid medium into said unit, agitating said pellets and liquid medium to achieve mixing thereof, controlling the temperature of the agitated mixture to achieve treating of the polyester pellets in agitated heating liquid medium at a temperature slightly below the sticking temperature of said polyester, and continuing such treatment for a period sufficient to substantially increase the crystallinity and molecular weight of said polyester.
Dependencies are inferred from the claim text.