Process for polymer degradation

Details Process for polymer degradation Process for polymer degradation

1995-10-13

1996-12-24

Weber, Thomas 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, 525388, C08F 804

Patent

active

055874347

ABSTRACT:
A process for reacting molten polyolefin with a free radical generator wherein the molten polyolefin passes through an extruder and free radical generator is mixed with the molten polyolefin in increments along the extruder such that any previously added free radical generator is decomposed before the next increment of free radical generator is added to the molten polyolefin. Products of the process demonstrate improved efficiency of free radical generator utilization as measured by enhanced melt flow rates relative to the total amount of free radical generator used.

REFERENCES:
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patent: 4897452 (1990-01-01), Berrier et al.
Coates, P. D. et al., "Reactive Extrusion of Polyolefins: In-Process Measurements." Pub. in `ANTEC 95` (Annual Technical Conference of the Society of Plastics Engineers), pp. 1620-1624.
Bonilla-Rios, J. et al., "Effects of Temperature, Peroxide Concentration, and Peroxide Addition Technique on the Molecular Weight Distribution of Controlled Rheology Polypropylene Resins." Pub. in `ANTEC 95` (Annual Technical Conference of the Society of Plastics Engineers), pp. 1625-1629.
Bonilla-Rios, J. et al., "A Stochastic Model For the Prediction of the Molecular Weight Distribution of (Controlled Rheology) Peroxide Degraded Polypropylene." Pub. in `ANTEC 95` (Annual Technical Conference of the Society of Plastics Engineers), pp. 1630-1634.
Bonilla-Rios, J. et al., "Effects of Temperature, Peroxide Concentration and Incorporation Technique on the Rheological Properties of Polypropylene Controleed Rheology Resins." Pub. in `ANTEC 95` (Annual Technical Conference of the Society of Plastics Engineers), pp. 1848-1852.
Rocha, M. et al., "A Study of Polypropylene Peroxide Promoted Degradation." Pub. In Journal of Polymer Testing, V 14, N 4, pp. 369-380 (1995).
Hwo, C., Ma, G. and McCullough, J., co-pending U.S. Patent Application entitled, "Process For Improving Processability of Ultra Low Flow Melt Viscosity Polymer." Ser. No.: 395,365. Filed Feb. 21, 1995.
Lew, R., Cheung, P., Blake, S. T., "Reactive Extrusion of Polypropylene." Pub. in Computer Applications in Applied Polymer Science, pp. 516-520.

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