Abstract: A method for manufacturing a multilayered composite molded part in a pressing tool, comprises: for a lower layer, particles provided with binder are poured into a mold in a lower part of the pressing tool; a pre-pressed molded part, which has coarser particles than those of the lower layer, is inserted into the first layer; the layers are compressed together with the pre-pressed, inserted molded part under the influence of pressure and heat so as to form the multilayered composite molded part, via the inserted molded part corresponding to the lower layer by means of an upper part of the pressing tool which is guided onto the upper layer. A product manufactured thereby has the form of a multilayered composite molded part with high strength and finely structured outer surfaces or layers and combines within it advantages of various conventional individual products.

Abstract: A method for manufacturing a multilayered composite molded part in a pressing tool, comprises: for a lower layer, particles provided with binder are poured into a mold in a lower part of the pressing tool; a pre-pressed molded part, which has coarser particles than those of the lower layer, is inserted into the first layer; the layers are compressed together with the pre-pressed, inserted molded part under the influence of pressure and heat so as to form the multilayered composite molded part, via the inserted molded part corresponding to the lower layer by means of an upper part of the pressing tool which is guided onto the upper layer. A product manufactured thereby has the form of a multilayered composite molded part with high strength and finely structured outer surfaces or layers and combines within it advantages of various conventional individual products.

Abstract: Improved phenolic foams are produced having a more uniform cell structure, improved mechanical and thermal properties, and improved foam structure by foaming a phenol-aldehyde oligomer condensate such as a resole, an extended resole, or a mixture of a resole and a novolac resin in the presence of N-methyl-2-pyrrolidone.