Extrusion grade polyethylene terephthalate

Details Extrusion grade polyethylene terephthalate Extrusion grade polyethylene terephthalate

1978-10-31

1980-08-26

Phynes, Lucille M.

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Including application of internal fluid pressure to hollow...

264541, 264542, 264543, 428 35, B29C 1707

Patent

active

042195276

ABSTRACT:
A process is disclosed for modifying polyethylene terephthalate so that the polyethylene terephthalate may be processed into plastic containers using conventional extrusion blow molding equipment. The polyethylene terephthalate is modified by the incorporation into a polyethylene terephthalate prepolymer of a chain branching agent and a chain terminating agent. The prepolymer is subsequently solid-state polymerized to form a polyethylene terephthalate polymer having high zero shear rate melt viscosity and shear sensitivity. This modified polyethylene terephthalate polymer may be extrusion blow molded in intermittent and continuous processes.

REFERENCES:
patent: 2951827 (1960-09-01), Siggel
patent: 3033824 (1962-05-01), Huffman
patent: 3673139 (1972-06-01), Hrach
patent: 3692744 (1972-09-01), Rich
patent: 3733309 (1973-05-01), Wyeth et al.
patent: 3803275 (1974-04-01), Corsover

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