Very low melt viscosity resin
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United States of America Patent
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Feb 15, 2005
Grant Date -
Feb 26, 2004
app pub date -
Aug 22, 2002
filing date -
Aug 22, 2002
priority date (Note) -
Expired
status (Latency Note)
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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.
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