Process for extruding a modified high molecular weight...

Details Process for extruding a modified high molecular weight... Process for extruding a modified high molecular weight...

B - Operations, Transporting

29

C

18/800

B29C 47/38 (2006.01) B29C 47/00 (2006.01) C08G 18/40 (2006.01) C08G 18/42 (2006.01) C08G 63/91 (2006.01)

Patent

CA 1175623

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 280-320°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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