3717559 is referenced by 34 patents and cites 5 patents.

A process for the preparation of a polypropylene resin foam having closed cells by irradiating high energy rays onto a mixture of a polypropylene resin, a foaming agent, and a cross-linking promotor to cause cross-linking of the polypropylene resin and thereafter heating the mixture to a temperature higher than the decomposition temperature of the foaming agent.

Title
Process for the preparation of polypropylene resin foams
Application Number
04/733,584
Publication Number
3717559
Application Date
May 31, 1968
Publication Date
February 20, 1973
Inventor
Osakada Atsushi
Ohkubo Shunji
Yamada Masaaki
Oyama Minoru
Assignee
Toray
IPC
C08f 01/16
C08f 47/10
C08f 27/00
C08J 09/00
View Original Source