申请人:SUMITOMO CHEMICAL COMPANY LIMITED
公开号:EP0662493A1
公开(公告)日:1995-07-12
The present invention provides a polyethylenic foaming composition comprising (a) 100 parts by weight of an ethylenic copolymer having glycidyl groups consisting of 20 to 99.9% by weight of an ethylene unit, 0.1 to 30% by weight of the unit of a glycidyl ester of an unsaturated carboxylic acid or an unsaturated glycidyl ether and 0 to 50% by weight of an ethylenically unsaturated ester unit other than glycidyl ester, (b) 0.1 to 30 parts by weight of a carboxylic acid having 2 or more carboxyl groups and a molecular weight of 1500 or less, and (c) 0.1 to 20 parts by weight of a foaming agent of a thermal decomposition type. The present invention also provides a polyethylenic foam molded from said foaming composition. In addition, the present invention provides a molded composite foam having a foam layer molded from a powder of said foaming composition and a non-foam layer molded from a composition powder containing a certain thermoplastic elastomer, as well as a multilayer molded article containing said molded composite foam.
According to the inventive polyethylenic foaming composition, a foam having excellent lightness in weight, excellent cleanness, uniformly foamed cells, high expansion ratio and excellent impact resilience can be obtained.
本发明提供了一种聚乙烯发泡组合物,该组合物包括 (a) 100 份(重量)具有缩水甘油基的乙烯共聚物,其缩水甘油基包括 20 至 99.9% (重量)的乙烯单元、0.1至30%(重量)的不饱和羧酸或不饱和缩水甘油醚的缩水甘油酯单元和0至50%(重量)的除缩水甘油酯以外的乙烯不饱和酯单元,(b)0.1至30份(重量)的具有2个或2个以上羧基且分子量为1500或1500以下的羧酸,和(c)0.1至20份(重量)的热分解型发泡剂。本发明还提供了一种由上述发泡组合物模塑而成的聚乙烯泡沫。此外,本发明还提供了一种模塑复合泡沫,其泡沫层由所述发泡组合物粉末模塑而成,非泡沫层由含有某种热塑性弹性体的组合物粉末模塑而成,还提供了一种含有所述模塑复合泡沫的多层模塑制品。
根据本发明的聚乙烯发泡组合物,可以获得重量轻、清洁度高、发泡均匀、膨胀率高和冲击回弹性好的泡沫塑料。