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US 2010/0143687 A1Published application
Polypropylene-based tape yarn produced from extruded film containing beta spherulites and methods of making and using thereof
OwnerPhilip Jacobyinventor
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Abstract
Disclosed herein is an oriented tape yarn produced from an extruded propylene-based polymer sheet or film comprising beta-spherulites in an amount sufficient to produce a K-value of from about 0.1 to about 0.95. Also disclosed herein are methods for making the tape yarns and their use thereof in carpet backing.
Claims25
An oriented polypropylene tape yarn comprising a propylene-based polymer formed from an extruded film or tape comprising beta-spherulites in an amount sufficient to produce a K-value of from about 0.1 to about 0.95.
A method for making an oriented polypropylene-based tape yarn comprising the steps of:
- a. melt forming a propylene-based extruded sheet or film comprising at least one beta-nucleating agent;
- b. cooling the propylene-based extruded sheet or film at a temperature sufficient to produce beta-spherulites in an amount sufficient to produce a K-value of from about 0.1 to about 0.95, and
- c. orienting the propylene-based extruded sheet or film to produce a tape yarn having a thickness that is less than 10 mils.
Dependencies are inferred from the claim text.