Sunoco Inc (r&m)

United States Steel Corporation

Victor M DiNardo

Kimberly Miller McLoughlin

Edwin B Townsend, Iv

Nicholas Z Karnavas

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.

Stabilization system for improving the melt viscosity of polypropylene during fiber processing

A method of making a polypropylene product for use in making films and preferably biaxially oriented films and more preferably biaxially oriented films wherein a tenter-frame processing line is employed. The method includes the addition of low concentrations of a nucleating system in a mini-random polypropylene that allows for better processability and improved tensile properties. In one embodiment the nucleating system comprises a blend of a monocarboxylic acid nucleating agent and dicarboxylic acid nucleating agent. The nucleating system is combined with the polypropylene material and the resultant hot melt blend is further processed into biaxially oriented film. Alternately, the hot melt blend is formed into a convenient raw material for later use in a biaxial oriented film production facility. The resulting films possess superior processing and material characteristics.

Polypropylene biaxially oriented film

An improved polypropylene blend for biaxial orientation into thin films is made by combining low molecular weight polypropylene, a peroxide agent, a nucleating agent, and linear low density polyethylene in a pelletizing extruder.

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Monroeville, PA, United States of America

Victor M DiNardo