Impact copolymer compositions for use in corrugated board
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United States of America Patent
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Jul 21, 2015
Grant Date -
Nov 29, 2012
app pub date -
May 25, 2011
filing date -
May 25, 2011
priority date (Note) -
Withdrawn
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Abstract
The present invention relates to polymer compositions comprising a propylene impact copolymer and a processing aid, as well as corrugated boards made from such compositions. The impact copolymer has a melt flow range of from 1.5 to 3.5 g/10 min and a dispersed phase content of from 5 to 30% by weight. The dispersed phase of the impact copolymer has an ethylene content of from 30- to 70% by weight of the dispersed phase. The matrix phase of the impact copolymer is a propylene homopolymer or a random copolymer comprising units derived from propylene and a second copolymer selected from either ethylene or 1-butene wherein the units derived from the second copolymer comprise from 0 to 5% by weight of the dispersed phase.
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