Polyethylene composition, objects made therefrom and process for

Details Polyethylene composition, objects made therefrom and process for Polyethylene composition, objects made therefrom and process for

1989-04-14

1991-11-19

Seccuro, Carman J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

524528, 525194, 525193, 521143, 521144, C08L 2306, C08L 2318, C08L 2326, C08J 900

Patent

active

050667254

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.

REFERENCES:
patent: 4223567 (1980-11-01), Hert
patent: 4413097 (1983-11-01), Matsuura et al.
Dutch Search Report (3 pages).

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