Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Cellular products or processes of preparing a cellular...
Patent
1989-11-15
1990-07-03
Foelak, Morton
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Cellular products or processes of preparing a cellular...
264 53, 264 54, 521 79, 521134, 521143, C08J 910, C08J 914
Patent
active
049391810
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 a 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 as well as a high flexibility.
REFERENCES:
patent: 4223567 (1986-11-01), Hert
patent: 4413097 (1983-11-01), Matsumura et al.
Foelak Morton
Stamicarbon B.V.
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