Extrusion grade polyethylene terephthalate

Details Extrusion grade polyethylene terephthalate Extrusion grade polyethylene terephthalate

1978-04-10

1979-07-17

Phynes, Lucille M.

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

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

260 4585R, 260 4595R, 264319, 528296, 528298, 528486, 528495, 525448, 525437, C08G 6376, C08G 6370

Patent

active

041615794

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

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