Process for fractionating polymers

Details Process for fractionating polymers Process for fractionating polymers

1989-11-29

1991-07-09

Teskin, Fred

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Treating polymer containing material or treating a solid...

528491, 528497, 528502, 528503, C08F 604

Patent

active

050307134

ABSTRACT:
An improved process for crystallizing polymer subjected to temperature rising elution fractionation is provided. The process improves the separation of the polymer species upon elution and significantly reduces "tailing" typically observed with such fractionated species. The improvements consists of crystallizing the polymer from a dilute polymer solution outside of the column and in the absence of column packing material. Only after crystallization is the polymer combined with the column packing material. This can be accomplished by either dry-blending or by slurrying.

REFERENCES:
patent: 3701764 (1972-10-01), Hargitay
Bergstrom et al., Investigation of the Composite Molecular Structure of LLDPE by . . . Temperature Rising Elution Fractionation, J. Applied Poly. Sci., 23, 163-171, 1979.
Usami et al., General Mechanism of Short-Chain Branching Distribution in Linear Low-Density Polyethylenes, Macromolecules, 19, 2722, 1986.

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