초록

The present invention relates to foamed products. More particularly, the present invention relates to foamed products comprising a plurality of coalesced extruded strands or profiles or layers of a foamed thermoplastic composition having a low density.

대표청구항 ▼

[What is claimed is:] [1.](a) providing a foamable composition comprising at least one polymer selected from the group consisting of alkylene aromatic polymers and alkylene aromatic copolymers and a blowing agent formulation,(b) extruding the composition through a die having a plurality of orifices,

[What is claimed is:] [1.](a) providing a foamable composition comprising at least one polymer selected from the group consisting of alkylene aromatic polymers and alkylene aromatic copolymers and a blowing agent formulation,(b) extruding the composition through a die having a plurality of orifices,(c) foaming the extruded composition at a foaming temperature which is above the glass-transition temperature or the melting temperature of the polymer or coplymer,(d) maintaining the foaming product at an elevated temperature for a sufficient period of time to obtain adhesion between individual foam strands, and(e) allowing the foamed product to cool, racterized in that in steps (d) and (e) the temperature of the foam is controlled based on the thermodynamic nature of the blowing agent formulation wherein:the blowing agent formulation has a low evaporative cooling capacity and step (e) includes an accelerated cooling of the foamed product orthe blowing agent has a high evaporative cooling capacity and step (d) includes a transfer of additional heat to the foaming product.