Beta-nucleation concentrates for film applications
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United States of America Patent
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Issued Date -
Aug 10, 2006
app pub date -
Feb 8, 2005
filing date -
Feb 8, 2005
priority date (Note) -
Abandoned
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Abstract
In one aspect, the invention is directed to a concentrate comprising a polypropylene resin and a beta-nucleating agent, wherein the nucleating agent is present in a concentration in the concentrate in a range of from about 0.005% to about 2.0%. In another aspect, the invention is directed to an extruded polypropylene sheet comprising a beta-nucleating agent concentrate in a concentration of between about 0.5% to about 50% by weight of the total polypropylene content. In a further aspect, the invention is directed to a method of manufacture of a beta-nucleating agent/polypropylene concentrate comprising the step of blending a substantially pure beta-nucleating agent with a substantially non-nucleated polypropylene resin to provide a concentration in the concentrate of from about 0.005% to about 2.0%. In yet another aspect, the invention is directed to a film produced by stretching the sheet.
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