Poromeric materials for footwear and other purposes are made from a non-woven fabric, a porous layer of certain defined foamed resins, and a thin microporous surface film. The foam is obtained from lattices containing liquid unsaturated polyester resins and acrylic and/or acrylonitrile resins.

Poromeric web materials are continuously manufactured by applying to a thin layer of ice crystals a textile fibrous structure and an aqueous solution or dispersion of A. polyethylenically unsaturated monomers having at least two polymerizable double bonds or mixtures of at least 0.1 percent w/w of such polyethylenically unsaturated monomers and monoethylenically unsaturated copolymerizable monomers and optionally high molecular weight polymers, or B. monoethylenically unsaturated monomers and hi...

A process for producing poromeric synthetic leather comprises I. producing an essentially nonporous impregnate by impregnating a textile sheet material with an aqueous polyurethane dispersion and drying, and II. producing a poromeric synthetic leather from the impregnate by subjecting the impregnate to the action of an aqueous solution of a Br.o slashed.nsted base.

The process of making poromeric materials which comprises impregnating webs of fibrous material with aqueous liquids containing olefinically unsaturated monomers which can be polymerized using redox catalysts, and, if desired, high polymeric plastics in dissolved, emulsified or dispersed form, freezing the webs of fibrous materials impregnated with the aqueous liquids, polymerizing the monomers using redox catalysts and thawing out and separating out the water and any residual monomer from the r...

A poromeric sheet material is provided with deporomerized areas selectively disposed at points where better mechanical strength is desired and where in addition better hydrostatic resistance is desired. Better mechanical strength means better abrasion resistance, better puncture resistance, better flex life. Better hydrostatic resistance means resistance to wetting-through, resistance to bibulousness, resistance to the passage of water-borne soiling agents. The deporomerized areas of the poromer...

The present invention shows how to make poromeric polymeric products by leaching out water-soluble electrolytes from a polymeric material with the help of galvanic or electrolytic current.

Production of poromeric materials by impregnating flat fibrous structures with liquids containing monoolefinically unsaturated monomers and high polymeric plastics in dissolved, emulsified or dispersed form, but no polyolefinically unsaturated monomers, freezing the impregnated fibrous structures, irradiating the frozen structures to effect polymerization of the monomers, and freeing the poromeric materials from the remaining liquid. The poromeric materials may be used as floor coverings, insula...

Poromeric material that is impermeable to water but permeable to gases such as air and water vapor. Material comprises a backing fabric, a first foamed layer of a vinyl polymer containing another polymeric material incompatible therewith, this first layer being bonded to the fabric, and a second layer similar to the first layer and bonded thereto, the second layer being foamed less than the first layer.

This invention is a process of making a flexible poromeric sheet material with a suede finish and the product produced by this process. A phase-invertible polymer solution, comprising an extended urethane polymer, a polyvinyl chloride resin, and a water-miscible solvent, is cast in a film onto a solid surface and phase-inverted in a water bath, containing a surface-active agent, to form a three-layered material comprising a skin layer adjacent the solid surface, a poromeric suede layer loosely b...

A poromeric material for maintaining an electrostatic charge is provided, the material including a matrix of fibers, a polymeric binder for binding the matrix, and electrets present substantially uniformly throughout the poromeric material. Also provided are methods for making the poromeric material. In one embodiment, a polymeric binder mixture having electrets substantially uniformly contained therein is formed. The matrix of fibers is impregnated with the mixture and cured, whereby the electr...