Pipe systems of polypropylene compositions
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United States of America Patent
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Sep 29, 2009
Grant Date -
Nov 15, 2007
app pub date -
Oct 15, 2002
filing date -
Oct 30, 2001
priority date (Note) -
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Abstract
n ratio of less than 3.5; and 3) 0-30 parts of a polymer of ethylene having a melting temperature over 120° C. and intrinsic viscosity of from 2 to 6 dL/g; with the proviso that when the elastomeric polyolefin is present, the polymer of ethylene is at least 12 parts based on 100 parts of the crystalline random propylene copolymer (1) and that at least one of the layer made of the said polymer propylene composition is substantially free from random copolymers of propylene with 15 wt % or less of ethylene as the sole comonomer.
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