Selective admixture of additives for modifying a polymer

Details Selective admixture of additives for modifying a polymer Selective admixture of additives for modifying a polymer

1993-10-26

1995-04-11

Michl, Paul R.

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

Synthetic resins

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

525387, 525240, 523324, 524 86, 524100, C08F 800, C08F 1000, C08C 1904

Patent

active

054059178

ABSTRACT:
The molecular weight of solid polymers, particularly polyolefins, is modified by addition of organic peroxides (or other free radical generators), which is admixed in a first reaction zone. The polymer is then melted followed by addition of additives such as antioxidants and light stabilizers, which are admixed in a second reaction zone where intense and rapid mixing occurs, such as within the barrel of an extruder. The separate admixture of primary and secondary additives provides improved color and odor characteristics for the polymer compared to concurrent admixture of all the additives.

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