Methods for forming hollow, porous-surfaced elastomeric bodies

Abstract From the Canadian patent

Abstract, A method of forming hollow porous elastomeric, bodies and hollow, dual-layered elastomeric bodies wherein one layer is porous and contiguous with the other layer which is solid by a) coating a surface of a mandrel with a coating liquid, b) adhering a layer of water-elutable particles onto the coated mandrel surface, c) applying a layer of fluid elastomeric composition to the particle-coated mandrel surface wherein the elastomeric composition is capable of forming a water-insoluble elastomer, d) causing said elastomeric composition to form a cohesive mass while in contact with the particle-coated mandrel surface e), dissolving said elutable particles from the cohesive mass with a …