The General Tire & Rubber Company

Gencorp, Inc.

Duro-Last, Inc.

Robert C Hultz

Richard W Stamper

Harry Hermanson

David R Grussing

A method of processing scrap, single-ply synthetic plastic roof-membrane sheet material comprising a fabric, having warp and weft strands composed of bundles of synthetic plastic fibers, encased in a thermoplastic synthetic plastic envelope. Comminuted pieces of the scrap are stuffed into a heat-applying, continuous mixer-extruder having screw mechanism within an elongate barrel chamber and the compressed material then is heated to plasticizing temperature and subjected to repetitive shear forces as it moves along the barrel chamber to a die discharge. The warp strands are separated from the weft strands via said shear force application and disembodied via said shear forces to provide discrete fibers in the mix of material. Finally, the fibers are randomly dispersed in the mix material and extruded.

Method of processing scrap roof-membrane sheet material comprising a

An uncured or cured rubbery roofing membrane of EPDM or polychloprene rubber has a cured, flexible epoxy resin coating which is flexible and adherent to the roofing membrane. The coating, also, may be pigmented.

Coated roofing membrane

Thermoplastic chlorosulfonated polyethylene fluxed with a minor amount of a plasticized and stabilized vinyl chloride polymer can be calendered with a reinforcing fabric on a standard PVC calender to provide a fabric coated on both sides with the fluxed chlorosulfonated polyethylene-PVC composition to provide a laminate useful as a roofing membrane.

Roofing membrane

A laminate comprises fused adherent layers of plastisol vinyl chloride polymer resins in which a first layer contains Sb.sub.2 O.sub.3 and a second layer contains TiO.sub.2. The flexible laminate is useful as a roofing membrane for the roof of a building wherein the layer containing the Sb.sub.2 O.sub.3 is adjacent a structural or insulation member of the roof of the building while the TiO.sub.2 layer can be exposed to the elements and can protect the Sb.sub.2 O.sub.3 layer from sunlight.

Growing community of inventors

Toledo, OH, United States of America

Robert C Hultz