Highly crystalline polypropylene
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Dec 19, 2000
Grant Date -
N/A
app pub date -
Mar 30, 1998
filing date -
Jul 31, 1996
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Expired
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Abstract
A highly crystalline polypropylene having a degree of crystallinity of at least 50.5% calculated from the heat of melting; and a relationship between a proportion f(R)of R-lamella with respect to spherulites and a weight-average molecular weight Mw which satisfies the following Formula (II). The above-mentioned proportion f(R) of R-lamella spherulites is calculated using the following Formula (I) from the birefringence .DELTA.n of crystallized spherulites obtained by melting said highly crystalline polypropylene at 230.degree. C. for 5 minutes, cooling to a temperature of 132.degree. C. at a cooling rate of 20.degree. C./minute, and then maintaining said temperature for 90 minutes. Molded articles obtained using the above-mentioned highly crystalline polypropylene or a resin composition containing the above-mentioned highly crystalline polypropylene resin are superior in rigidity, heat resistance, scratch resistance, dimensional stability, and low production of odor during molding, and can be widely used in various applications. f(R)=(-.DELTA.n+0.0351).times.100/0.0528 Formula (I) f(R)>-2.5.times.(log{Mw}-4).sup.2 +88.9 Formula (II).
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