Method for producing propylene polymeric material
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United States of America Patent
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Sep 6, 2016
Grant Date -
Mar 3, 2016
app pub date -
Aug 27, 2015
filing date -
Aug 29, 2014
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Abstract
A method is provided for producing a propylene polymeric material containing a propylene polymer component high in content of α-olefin units. The material can be produced stably without stopping of the operation due to clogging of a pipe. The method is one for producing a propylene polymeric material composed of a propylene polymer component (A) and a propylene polymer component (B) via at least two steps, including a first step of producing the component (A) and a second step of producing the component (B) in a gas phase. The partial pressure of the α-olefin having four or more carbon atoms in the gas phase in the second step reactor is 0.10 MPa or more. A formula, X≦0.0025×Y+0.2850, is satisfied, wherein the partial pressure is X MPa, and the content of the propylene polymer component (A) in the propylene polymeric material is Y % by weight.
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