초록 ▼

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/cm3 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. Fo

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/cm3 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/m3 and the 25 percent compressive strength, F, in kg/cm2 is from 0.013D1.15 to 0.024D1.15 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: 10≤Y≤3.94.7+1.18R-294.1 log (D).

대표청구항 ▼

A substantially closed-cell polymer blend foam characterized by a density, D, of from 10 to 40 kg/m3, a 25 percent compressive strength, F, in kg/cm2 satisfying the formula 0.024D1.15≥F≥0.013D1.15, a compression recovery of 90 percent or greater, and a toluene solvent resistance in terms of volumetr

A substantially closed-cell polymer blend foam characterized by a density, D, of from 10 to 40 kg/m3, a 25 percent compressive strength, F, in kg/cm2 satisfying the formula 0.024D1.15≥F≥0.013D1.15, a compression recovery of 90 percent or greater, and a toluene solvent resistance in terms of volumetric change of 10 percent or smaller, prepared by extrusion foaming a homogeneous blend consisting of low density polyethylene having a density of from 0.915 to 0.930 g/cm3 and a melt index of 0.2-2.6 g/10 minutes; polystyrene having a melt flow rate of 1.4-18 g/10 minutes; one or more volatile organic blowing agents; and optionally light stabilizers, colorants, lubricants and nucleating agents, said blend meeting the requirements 7≤R≤90 10≤Y≤394.7+1.18R-294.1 log (D) wherein R is a ratio of the melt flow rate of the polystyrene resin divided by the melt index of the polyethylene resin, Y is the content of the polystyrene resin in parts by weight per 100 parts by weight of the polyethylene resin, and D is as defined above.