Modified PET polymers and copolymers suitable for extrusion blow

Details Modified PET polymers and copolymers suitable for extrusion blow Modified PET polymers and copolymers suitable for extrusion blow

1985-01-30

1985-11-19

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...

528272, 5283082, 528486, C08G 6376

Patent

active

045543291

ABSTRACT:
There is disclosed an improved modified polymer suitable for use in making hollow containers by conventional extrusion blow molding. It is a specific type of end-capped and branched polyethylene terephthalate polymer or copolymer. In the improvement, (a) the end-cap comprises the reacted component of a monofunctional acid having a normal boiling point or sublimation point less than above about 200.degree. C.; and (b) the monofunctional acid is an aromatic monocarboxylic acid having the formula: ##STR1## wherein: R.sub.3 and/or R.sub.5 is an alkoxy group containing from 1 to 10 carbon atoms; and, the remaining R's are hydrogen. The preferred monocarboxylic acid is m-anisic acid. The product typically contains few large gels having diameters greater than 0.1 mm.

REFERENCES:
patent: 4161579 (1979-07-01), Edelman et al.
patent: 4223125 (1980-09-01), Bier et al.
patent: 4393178 (1983-07-01), Legras et al.

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