Oblon, Fisher, Spivak, McClelland & Maier
Methods of producing molded products from foamed polypropylene particles
 A method of producing a polypropylene resin molded product from foamed polypropylene particles is disclosed, which comprises introducing a pressurizing gas into foamed polypropylene particles having closed cells so that the particles have an internal gas pressure of from 0.3 to 2.5 Kg/cm.sup.2 G, charging the particles in a mold cavity while compressing the particles with a pressurizing inorganic gas until the initial apparent volume of the particles is reduced to 50 to 99%, removing the gas from the mold cavity while keeping the foamed particles in a compressed state, and introducing steam in the cavity to cause adhesion of the compressed foamed particles. The method produces a molded product having satisfactory appearance and excellent adhesion among particles in a shortened molding cycle. 
Mitsubishi Yuka Badische Co., Ltd.
Y C B B B C Y
Y10S C08J B29C B29C B29K C08J Y10S
additional additional inventional additional additional inventional additional
Masakazu Masanori Hiroshi Kunikazu Shigeo Masahiro Shigeki
Arai Saito Endo Nagasaki Nishikawa Tanaka Mathuno