Process for extruding a modified high molecular weight poly(ethy

Details Process for extruding a modified high molecular weight poly(ethy Process for extruding a modified high molecular weight poly(ethy

1981-12-21

1983-10-11

Thurlow, Jeffery R.

Plastic and nonmetallic article shaping or treating: processes

Vacuum treatment of work

To degas or prevent gas entrapment

264176R, 2642107, 264211, 264349, 425203, 525437, 5283091, B29B 110

Patent

active

044091672

ABSTRACT:
Poly(ethylene terephthalate) resin and blends of poly(ethylene terephthalate) resin with other polymers are extruded while being coupled with an organic diisocyanate under conditions where carbon dioxide gas is vented smoothly, as it is formed. The extruder has a number of zones designed to perform specific functions. The temperature in the kneading zone and in the venting zone must be maintained at about 280.degree.-320.degree. C. to bring about rapid reaction and to permit efficient gas evolution and removal without thermally degrading the polymeric material. The extruded article is free of trapped gas bubbles and other imperfections. This process is particularly suitable for making PET billets, which then are stretched to form strapping useful in packaging applications.

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