Very low melt viscosity resin

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...

Reexamination Certificate

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Details

C525S387000

Reexamination Certificate

active

06855777

ABSTRACT:
A process is provided for the production of a very low melt viscosity (high melt flow index) polymer resin, suitable for use in meltblown processing. According to the process of the current invention, a high melt viscosity (low melt flow index) resin is subjected to post-reactor molecular weight alteration by extrusion with a chemical prodegradant. The process produces a very low melt viscosity resin that can be used in meltblown processing without further treatment to reduce the average molecular weight of the resin. Further, the very low melt viscosity resins produced according to the process of the current invention contain very little or no residual prodegradant.

REFERENCES:
patent: 4451589 (1984-05-01), Morman et al.
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Ethylene-propylene copolymers with high flow index. Popisil, Ladislav; Pac, Jiri; Petruj, Jaroslav; Sula, Karel; Ottis, Jiri; Sulc, Zdenek. Czech. CS 239,716 (Cl. C08F8/50), Apr. 15, 1987, Appl. 84/595, Jan. 26, 1984; 6 pp.

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