Beta-crystalline form of isotactic polypropylene and method for forming the same
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United States of America Patent
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Jul 27, 1993
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N/A
app pub date -
Feb 9, 1989
filing date -
Apr 1, 1985
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Expired
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Abstract
This invention relates to obtaining beta crystalline Phase isotactic polypropylene with high purity and thermal stability simply by melt-crystallization in the presence of a two component beta nucleating agent. The two component beta-nucleating agent is formed by mixing 0.0001-1 weight % of dibasic acid with 0.001-1 weight % oxide, hydroxide or acid salt of a Group IIA metal. Such beta phase polypropylene can be used for the production of high impact strength molding extrusion shapes, microporous film and microporous hollow fiber.
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