Oblon, Spivak, McClelland, Maier & Neustadt
Process for producing foamed thermoplastic resin articles
 A process for producing a foamed thermoplastic resin article is disclosed, comprising separately melt kneading the first thermoplastic resin composition comprising a first thermoplastic resin and 10 to 400 parts by weight per 100 parts by weight of the first thermoplastic resin of a filler and constituting an unfoamed layer at the time of extrusion molding, and the second thermoplastic resin composition comprising a second thermoplastic resin and a foaming agent and constituting a foamed layer at the time of extrusion molding, by the use of extruders, and extruding the two resin compositions in the form of laminate through a T die. 
Mitsubishi Petrochemical Co., Ltd.
B B B B B B B B
B29L B29C B29C B29C B29K B29C B29C B29C
additional additional inventional inventional additional inventional inventional inventional
Yasuyosi
Suzuki