C - Chemistry – Metallurgy – 08 – J
Patent
C - Chemistry, Metallurgy
08
J
403/64
C08J 9/14 (2006.01) C08J 9/00 (2006.01)
Patent
CA 1210900
ABSTRACT OF THE DISCLOSURE The invention provides a foamed body of a chlorine- containing synthetic resin of high expansion with extremely low bulk density still retaining very fine and uniform cel- lular structure. Different from conventional foamed bodies of polyvinyl chloride resins, the inventive foamed body is formed of a chlorinated polyvinyl chloride resin so that the foamed body has excellent heat resistance. The method for the preparation of the foamed resin comprises: preparing a resin composition comprising a chlorinated polyvinyl chlo- ride resin or a mixture thereof with a polyvinyl chloride resin, a foam conditioning resin, e.g. an acrylic resin or a styrene-based resin, and a cell uniformizing agent, e.g. a heat-decomposable blowing agent or an inorganic fine powder; supplying the resin composition to the cylinder of an ex- truder machine; uniformly impregnating the at least partly molten resin composition in the cylinder with a volatiliz- able blowing agent by pressurization; and shaping the resin composition by extruding out of the extruder with simultane- ous expansion by foaming.
434304
Eguchi Yoshitugu
Imada Kiyoshi
Matsumoto Osamu
Tsuchida Michinori
Gowling Lafleur Henderson Llp
Shin-Etsu Chemical Co. Ltd.
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