Composite structure of a first heat curable rubber polymer material and a second heat curable rubber polymer material having a homogeneous chemical bond

摘要

A method of molding articles having layers or sections of varying hardness in which the interface between the diverse hardness consists of a permanent homogeneous intermaterial crosslink and therefore continuous chemical bond. The invention contemplates using combinations of selected peroxide catalyzed reactions to crosslink very high molecular weight, heat curable, high consistency polymers of diverse cured hardness across composition boundaries. The technique involves combining selected heat-curable materials of various hardnesses and combining each with selected peroxide crosslinking catalysts having various half-lifes with respect to free radical decay.