Blended polyethylene-polystyrene compositions suitable for prepa

Details Blended polyethylene-polystyrene compositions suitable for prepa Blended polyethylene-polystyrene compositions suitable for prepa

1984-12-14

1987-03-24

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521 59, 521 81, 521 98, 521910, 264 53, 264DIG5, C08J 900

Patent

active

046525904

ABSTRACT:
Ethylenic polymer/styrenic polymer blend foams are prepared from blends of (1) an ethylenic polymer resin having a density of from 0.915 to 0.930 g/cm.sup.3 and a melt index of from 0.2 to 2.6 grams/10 minutes and (2) a styrenic polymer resin having a melt flow rate of from 1.4 to 18 grams/10 minutes. Foams having an excellent overall combination of properties are obtained (1) when the density, D, of such foams is in the range of from 10 to 40 kg/m.sup.3 and the 25 percent compressive strength, F, in kg/cm.sup.2 is from 0.013D.sup.1.15 to 0.024D.sup.1.15 and (2) when the ratio, R, of the melt flow rate of the styrenic polymer employed divided by the melt index of the ethylenic polymer employed is from 7 to 90 and the content, Y, of the styrenic polymer in said blend, in parts by weight based upon 100 parts by weight of the ethylenic polymer resin, satisfies the following requirement:

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