Extrusion process for difficultly-melt-processible polymers

Details Extrusion process for difficultly-melt-processible polymers Extrusion process for difficultly-melt-processible polymers

1990-09-20

1991-11-12

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

Forming articles by uniting randomly associated particles

Autogenously or by activation of dry coated particles

264169, 2641761, 264211, 264300, 425461, 425467, 427135, B29C 4794

Patent

active

050645943

ABSTRACT:
Improved process for extruding through a die a difficultly-melt-processible polymer, especially a polymer containing an additive such as an antiblock agent. There is first extruded through the die a polymer resin containing 0.001 to 1 wt. % of a copolymer of tetrafluoroethylene and a functional-group-containing monomer that is terminated in a -CF.sub.2 W group wherein W is selected from -SO.sub.2 F, -SO.sub.2 Cl, -SO.sub.3 M, -COOR and -COOM, R is a C.sub.1-3 alkyl radical and M is H, a metal cation or an ammonium or quaternary ammonium cation, and thereafter there is extruded through the die the difficultly-melt-processible polymer admixed with 0.001-1 wt. % of a fluoropolymer process said having a fluorine to carbon ratio of at least 1:2.

REFERENCES:
patent: 3125547 (1964-03-01), Blatz
patent: 3942937 (1976-03-01), Prober et al.
patent: 4324748 (1982-04-01), Hatakevama et al.
patent: 4740341 (1988-04-01), Chu
patent: 4812267 (1989-03-01), Hoffmann et al.
patent: 4948543 (1990-08-01), Pawlowski et al.

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