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Blended polyethylene-polystyrene compositions suitable for preparation of closed cell foam products
Blended polyethylene-polystyrene compositions suitable for preparation of closed cell foam products
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机译:适于制备闭孔泡沫产品的共混聚乙烯-聚苯乙烯组合物
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摘要
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: ##EQU1##
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机译:乙炔聚合物/苯乙烯聚合物共混物泡沫体是由(1)密度为0.915至0.930 g / cm 3,熔融指数为0.2至2.6克/ 10分钟的烯属聚合物树脂的共混物制备的。 (2)具有1.4至18克/ 10分钟的熔体流动速率的苯乙烯聚合物树脂。 (1)当这种泡沫的密度D在10到40 kg / m 3的范围内,并且压缩强度F以千克/ kg计为25%时,可获得具有优异综合性能的泡沫(1) cm.sup.2为0.013D.sup.1.15至0.024D.sup.1.15,并且(2)当所用苯乙烯聚合物的熔体流动速率的比值R除以所用乙烯类聚合物的熔体指数时为7至90,并且所述共混物中苯乙烯类聚合物的含量Y,基于100重量份的烯类聚合物树脂,以重量份计,满足以下要求:## EQU1 ##
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