Propylene-based copolymer composition for pipes
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United States of America Patent
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Mar 13, 2018
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app pub date -
Jun 29, 2015
filing date -
Jul 25, 2014
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Abstract
A polyolefin composition made from or containing (A) from 90.0 to 99.0 wt % of a first propylene ethylene copolymer wherein (i) the ethylene derived units is between 1.0 and 8.0 wt %; (ii) the melting temperature ranges from 135 to 155° C.; (iii) the melt flow rate (230° C./5 kg ISO 1133) ranges from 0.2 to 3.5 g/10 min; (iv) the xylene solubles at 25° C. ranges from 10.0 to 4.0 wt %; (v) the polydispersity index ranges from 3.0 to 7.0; and (B) from 1.0 to 10.0 wt % of a second propylene ethylene copolymer (i) containing from 8.0 to 20.0 wt % of ethylene derived units; and having a MFR (measured at 190° C. 2.16 kg of load) between 0.5 and 5.0 g/10 min, wherein (a) the resulting polyolefin composition has a melt flow rate (230° C./5 kg ISO 1133) ranging from 0.2 to 4.0 g/10 min and (b) the sum A+B being 100.
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