A process for producing synthetic resin foam

B - Operations – Transporting – 29 – C

Patent

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B29C 67/20 (2006.01) B29B 7/02 (2006.01) B29C 47/00 (2006.01) C08J 9/00 (2006.01) C08J 9/12 (2006.01) C08J 9/14 (2006.01) C09K 15/14 (2006.01)

Patent

CA 2034319

The present invention concerns the following subjects: (I) A process for producing a synthetic resin foam composed of ceps having substantially two sizes, one of the sizes being at most 0.3 mm and the other size being 0.4 to 1 mm, comprising the steps of: forming a mixture of a water-absorbent high molecular compound, a cell controlling agent and a synthetic resin; kneading and melting the mixture with heating; incorporating water together with a volatile-type foaming agent into the mixture under pressure; and extruding the mixture into a lower pressure space to form a foam. (2) A process for producing a synthetic resin foam composed of cells having substantially two sizes, one of the sizes being at most 0.3 mm and the other size being 0.4 to 1 mm, comprising the steps of: forming a mixture of a water-absorbent high molecular compound, a cell controlling agent and a synthetic resin; adding water little by little to the mixture while or after mixing the mixture; introducing the mixture into an axtruder; kneading and melting the resulting mixture with heating; incorporating a volatile-type foaming agent into the mixture under pressure; and extruding the mixture into a lower pressure space to form a foam.

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