Very low melt viscosity resin

Details Very low melt viscosity resin Very low melt viscosity resin

2006-01-31

2006-01-31

Choi, Ling-Sui (Department: 1713)

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

Synthetic resins

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

C525S387000

Reexamination Certificate

active

06992146

ABSTRACT:
A process is provided for the production of a very low melt viscosity (high melt flow index) polymer resin, suitable for use in spunbond or 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 spunbond or 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: 4578430 (1986-03-01), Davison
patent: 4897452 (1990-01-01), Berrier et al.
patent: 5594074 (1997-01-01), Hwo et al.

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