Composite resin composition, resin foam and process for producing the same

7:

• A method of producing resin foam comprising the steps of:
• heating a composite resin composition according to claim 1 comprising organized denatured clay having the average molecule diameter of 150 nm or below and not showing no peak angle value when subjected to wide-angle X ray diffraction to a temperature not lower than the melting point (Tm) of the composite resin composition and not higher than (Tm+50)° C.;
• infiltrating a supercritical phase gas into the composite resin composition in the fused state;
• and
• cooling the composite resin composition infiltrated with the supercritical gas to a temperature within ±20° C. from the crystallizing temperature of the composite resin composition for degassing.

8:

• A method of producing resin foam comprising the steps of
• infiltrating a supercritical gas with the temperature in the gas atmosphere not lower than the crystallizing temperature (Tc) of said composite resin composition −20° C. ((Tc−20)° C.) and not higher than the crystallizing temperature (Tc) of said composite resin composition +50° C. ((Tc+50)° C.) into the composite resin composition according to claim 1 comprising organized denatured clay having the average molecule diameter of 150 nm or below and not showing no peak angle value when subjected wide-angle X ray diffraction;
• and
• cooling the composite resin composition infiltrated with the supercritical gas to a temperature within ±20° C. from the crystallizing temperature of the composite resin composition for degassing.

9:

• The method of producing resin foam according to claim 7 comprising the steps of:
• molding the composite resin compound infiltrated with the supercritical gas in a molding box;
• and
• depressurizing inside of the molding box with the composite resin composition molded therein for degassing.

14:

• A method of producing resin foam comprising the steps of:
• infiltrating a supercritical gas into a resin composition comprising a thermoplastic resin by 100 weight portions and a layered silicate by 0.1 to 40 weight portions, said layered silicate having the average grain diameter (major axis) of 100 nm or below and also not showing any identifiable peak angle value in wide-angle X ray diffraction when said resin composition is in the temperature range from the melting point (described as Tm hereinafter) to (Tm+50)° C.;
• and
• cooling the resin composition to the temperature (the crystallizing temperature of said resin composition (described as Tc hereinafter)±20)° C. for degassing.

16:

• A method of producing resin foam comprising the steps of:
• infiltrating a supercritical gas into a resin composition comprising a thermoplastic resin by 100 weight portions and a layered silicate by 0.1 to 40 weight portions, said layered silicate having the average grain diameter (major axis) of 100 nm or below and also not showing any identifiable peak angle value in wide-angle X ray diffraction when the temperature in the gas atmosphere is in the temperature range from the melting point (Tc−20) to (Tc+50)° C.;
• and
• cooling the resin composition to the temperature (Tc±20)° C. for degassing.

19:

• The method of producing resin foam according to claim 8 comprising the steps of:
• molding the composite resin compound infiltrated with the supercritical gas in a molding box;
• and
• depressurizing inside of the molding box with the composite resin composition molded therein for degassing.