Polyethylene composition, objects made therefrom and process for the manufacture of foamed objects
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United States of America Patent
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Nov 19, 1991
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N/A
app pub date -
Apr 14, 1989
filing date -
May 19, 1988
priority date (Note) -
Expired
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Abstract
The invention relates to polyethylene compositions comprising 20-98 wt % branched polyethylene a) with a density of between 915 and 940 kg/m.sup.3 and a melt flow index of between 0.05 and 40 dg/minute, prepared by a high pressure radical process, and 2-80 wt % substantially linear polyethylene b) with a density of between 850 and 915 kg/m.sup.3, a melt flow index of between 0.05 and 25 dg/minute and a DSC crystallinity at 23.degree. C. of at least 10%, prepared with the aid of a transition metal catalyst, the difference between the highest crystallization temperature of branched polyethylene a) and the highest DSC crystallization temperature of linear polyethylene b) being at most 10.degree. C. and the mixture having modulus of elasticity of at most 280 N/mm.sup.2 and objects made therefrom. These polyethylene compositions, when processed to foamed objects, have a high resistance to high temperatures ss well as a high flexibility.
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