POLYPROPYLENE GRIDS MANUFACTURED WITH A BETA NUCLEATION ADDITIVE, THE METHOD OF MANUFACTURE AND USES THEREOF
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United States of America Patent
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Issued Date -
May 30, 2013
app pub date -
Jun 20, 2012
filing date -
Jun 25, 2004
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Abandoned
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Abstract
Integral polymer grids, such as geogrids, are made by stretching and orienting a polypropylene starting sheet material having a defined pattern of holes or depressions in which the polypropylene is at least 50%, and preferably up to about 80%, beta crystals caused by adding a beta nucleating agent to the polypropylene, preferably in concentrations between about 10 ppm to about 100 ppm. Such beta nucleated polypropylene grids exhibit increased yield and break tensile strengths, increased 2% and 5% tensile strengths, increased modulus characteristics, increased torsional stiffness, increased impact strength, and increased grid junction strength. Methods for manufacturing the beta nucleated polypropylene mesh grids are disclosed, along with applications for stabilizing particulate material in civil engineering structures, and the like.
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