PROCESSES FOR PRODUCING SHAPED FOAMABLE PARTS

摘要

The invention relates to a process for producing shaped foamable parts from a polymer composition containing polymer and a foaming and curing additive package which includes the steps of: (a) dry blending at least the blowing agent part of the foaming and curing additive package of the composition with a wax powder to produce a dry blend; (b) melt blending the dry blend and any residual parts of the composition at a temperature between the melting point and not more than 10 DEG C, preferably not more than 5 DEG C, above the melting point using a low shear condition to produce a melt blend; (c) moulding the melt blend within the temperature and shear conditions of step (b). Foamable parts having good foam characteristics can be made on an industrial scale. The closed-foam cells are even. The foam adheres to metal surfaces.