Foam made from modified polypropylene resin and process for the production thereof

摘要

PCT No. PCT/JP96/02037 Sec. 371 Date Dec. 17, 1997 Sec. 102(e) Date Dec. 17, 1997 PCT Filed Jul. 19, 1996 PCT Pub. No. WO97/05183 PCT Pub. Date Feb. 13, 1997The present invention relates to a foamed article comprising a modified polypropylene resin which is a graft copolymer of a polypropylene resin and an aromatic vinyl monomer and has an average number of the grafted aromatic vinyl chains of not less than 1 in one molecule of the graft copolymer and a weight average molecular weight of the grafted aromatic vinyl chains of not less than 200, and relates to a process for preparation thereof. According to the present invention, the foamed article comprising the polypropylene resin and having a high closed cell content, a high expansion ratio and good external appearance can be provided.