Process for production of foamed resin sheet

B - Operations – Transporting – 29 – C

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B29C 47/14 (2006.01) C08J 9/12 (2006.01)

Patent

CA 2648342

The invention provides a process for the production of foamed resin sheets which enables satisfactory dispersion of a nucleating agent in a thermoplastic resin and which attains excellent extrusion and is excellent in productivity. A process for the production of foamed resin sheets by extruding a thermoplastic resin composition prepared by incorporating a nucleating agent and a blowing agent consisting of a gas containing nitrogen and/or carbon dioxide into a thermoplastic resin, characterized in that the thermoplastic resin composition further contains a high-molecular ester and a wetting agent exhibiting a coefficient of kinematic viscosity at 100°C of 70 to 2700cSt.

La présente invention concerne un procédé de production de feuilles de résine expansée qui permet une dispersion satisfaisante d'un agent de nucléation dans une résine thermoplastique et qui atteint une excellente extrusion et est excellent en termes de productivité. La présente invention concerne un procédé de production de feuilles de résine expansée par l'extrusion d'une composition de résine thermoplastique préparée en incorporant un agent de nucléation et un agent d'expansion constitué d'un gaz contenant de l'azote et/ou du dioxyde de carbone dans une résine thermoplastique, caractérisé en ce que la composition de résine thermoplastique contient en outre un ester de grande molécularité et un agent mouillant présentant un coefficient de viscosité cinématique à 100 °C allant de 70 à 2700 cSt.

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