Bridgestone Tire Company Limited

Shigetake Sato

Toru Okuyama

Suminobu Kurahashi

Susumu Muta

Noboru Hamada

Method for the preparation of a foam polyamide in which the lactam together with a basic catalyst at a temperature above the melting point of the lactam is mixed with the promoter and foaming agent in a mixing vessel at ambient temperature while subjecting the mix to violent agitation to initiate polymerization, and the mix is discharged into a container for completion of the reaction before polymerization is more than 10% complete.

Process for continuous preparation of a foam polyamide

Methods of preparing polyamide foam comprising polymerizing and foaming a mixture of one or more specified lactams, a basic alkali metal lactam catalyst, an alkyl isocyanate activator and a foaming agent at a temperature above the melting point of the lactam, and below the melting point of the polyamide foam thus produced.

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Kamakura, Japan

Shigetake Sato