Method to process narrow molecular weight distribution polyolefi

Details Method to process narrow molecular weight distribution polyolefi Method to process narrow molecular weight distribution polyolefi

1995-01-13

1996-07-30

Weber, Thomas R.

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

Synthetic resins

Treating polymer containing material or treating a solid...

528502F, C08F 800

Patent

active

055412858

ABSTRACT:
This invention relates to a method to process narrow molecular weight distribution polyolefins, particularly thermoplastics, polyethylenes, polypropylenes, and polyacrylates, whether they are homopolymers or copolymers. The process may be used in any extruder and is typically implemented along the extruder screw and/or barrel by heating the first zone the screw/barrel to place the polyolefin into a molten, flowable state. Thereafter, the polymer is cooled in the second heating zone to a point 50.degree. C. above or 10.degree. C. below the crystalline melting temperature of the polymer and thereafter is reheated in the final heating zone to a molten, flowable state and finally extruding it within 5 seconds or less through the die.

REFERENCES:
patent: 4452977 (1984-06-01), Brasz et al.

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