| 摘要 |
1,208,403. Grafted polypropylene and foams thereof. MITSUBISHI PETROCHEMICAL CO. Ltd. 6 Jan., 1969 [12 Jan., 1968], No. 810/69. Headings C3C and C3G. Polypropylene is subjected to ionizing radiation at a dosage of 0.1 to 5 megarads prior to being grafted with 0.5 to 6%, by weight of the polypropylene, of divinyl benzene and, optionally, also up to 10% of an acrylic acid ester. The grafted polypropylene may be mixed with a foaming agent, e.g. azobiscarbonamide or N,N<SP>1</SP> - dinitrosopentamethylene tetramine and heated to yield a foamed product. In the examples, powdered polypropylene is subjected to electron rays from a linear accelerator, immersed in a methanol solution of divinyl benzene and, optionally, ethyl acrylate and heated to form a graft polymer which is then foamed.
|
