Stabilization system for improving the melt viscosity of polypropylene during fiber processing
AssigneeSunoco, Inc. (R&M)
InventorsKimberly Miller McLoughlin, Edwin B. Townsend, Victor M. DiNardo
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Abstract
The present invention is a stabilizing system for improving the melt viscosity of polyolefin resin during fiber processing. The addition of a liquid phosphite melt processing stabilizer to polypropylene homopolymer powder improves processing stability during spinning. The present invention covers spraying the liquid phosphite onto the powder along with octadecyl 3,5-di-tert-butyl-4-hydroxyhydrocinnamate which is applied via mineral oil solution in a steamer.
Claims17
A stabilized polypropylene for use in fiber processing comprising:
- a polypropylene, said polypropylene being coated with a stabilizer system consisting essentially of:
- 50 to 100 ppm of a phenolic anti-oxidant and 150-500 ppm of a liquid phosphite;
- said anti-oxidant and said phosphite being dispersed or dissolved in a liquid carrier.
A method for improving the melt viscosity control of polypropylene in fiber processing, the method comprising:
- spraying a stabilizer composition onto a polypropylene, said polypropylene being in powder form, wherein said stabilizer composition consists essentially of:
- approximately 50-100 ppm of a phenolic anti-oxidant, and approximately 150-500 ppm of a liquid phosphite, said anti-oxidant and said phosphite being dispersed or dissolved in a liquid carrier.
Dependencies are inferred from the claim text.