US 2010/0167013 A1 · Thermoplastic roofing membranes

Abstract

The present invention provides thermoplastic roofing membranes comprising particles of crosslinked rubber and an aqueous (co)polymer dispersion. The thermoplastic roofing membranes are formed by combining particles of crosslinked rubber and a suspension polymer dispersion, or a coagulated aqueous latex (co)polymer dispersion, to form a mixture in aqueous dispersion, which aqueous dispersion mixture is subjected to solid state shear pulverization to form materials that can be processed as thermoplastics at crosslinked rubber concentrations of from 10 wt.% to as high as 95 wt.%, based on the total solids of the material. The method may further comprise kneading the pulverized product, followed by extrusion to form roofing membranes.

Claims12

Dependent claims

A roof membrane made by a process comprising:

(a) coagulating one or more aqueous polymer dispersion to produce a coagulated aqueous polymer dispersion with a weight average particle size of from about 1 micron to about 1,000 microns;
(b) combining particles of one or more crosslinked rubber with the aqueous polymer dispersion, before or after coagulating the aqueous polymer dispersion, to form an aqueous dispersion mixture in aqueous dispersion;
(c) subjecting the aqueous dispersion mixture to solid state shear pulverization and thereby producing a pulverized mixture;
(d) reducing the moisture content of the mixture;
and
(e) forming the roof membrane;
wherein the coagulating of the one or more aqueous polymer dispersion may be carried out either prior to combining with the particles of crosslinked rubber, or in the presence of the particles of the crosslinked rubber.

4 more elements

Dependencies are inferred from the claim text.

Thermoplastic roofing membranes

Life of this patent

Thermoplastic roofing membranes

Life of this patent

Abstract

Claims12