Process for melt extrusion of polymers

Details Process for melt extrusion of polymers Process for melt extrusion of polymers

1990-09-20

1992-02-18

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

264130, 264169, 2641761, 264211, 264300, 425461, 425467, 427135, B29C 4794

Patent

active

050892002

ABSTRACT:
Process of melt extruding through an extrusion die whose surface is coated with one or more metal oxides, M.sub.x O.sub.y, wherein M is a metal selected from the group consisting of Ti, Zr, Cr, Fe, Ni, Pd, Pt, Cu, Ag, Au, Al and Si, and x and y are selected to satisfy the valencies of M, a difficultly-melt-processible polymer containing 0.002-2 parts by weight, based on the weight of the polymer, of at least one melt-processible fluorocarbon polymer processing aid having a fluorine to carbon ratio of at least 1:2 and having metal oxide-reactive sites capable of reacting with or physically associating with the metal oxide of the die surface.

REFERENCES:
patent: 3125547 (1964-03-01), Blatz
patent: 3942937 (1976-03-01), Prober et al.
patent: 4552712 (1985-11-01), Ramamurthy
patent: 4554120 (1985-11-01), Ramamurthy
patent: 4615858 (1986-10-01), Su
patent: 4812267 (1989-03-01), Hoffmann et al.

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