The present invention relates to low-cost, efficiently-manufactured,
polymer-based products useful as roofing
shingles and similar products. The inventive
shingles are weatherproof, inexpensive to manufacture and durable, particularly as contrasted with conventional
shingles in areas of the country subject to hail damage. The invention also includes a method of making such shingle products. In a preferred embodiment, products of this invention use
rubber material as the
polymer base in combination with specific types of polyolefins. The
rubber material can be most efficiently provided by the use of
crumb rubber particles from spent automobile tires and other recycled rubber debris which are readily available and of very low cost. The products will have an average life far greater than that of current commercial roofing shingles, which are made using fiberglass or
asphalt.The products of the instant invention are produced by
extrusion as a mixture of materials, which product and its materials can be summarized as follows as a roofing shingle product which comprises:a. one or more side-branched polyolefins as an
elastomer;b. optionally a blend of additional synthetic polymers, such as
ethylene and propylene, as a second
elastomer; andc. a rubber fraction, preferably obtained in part from recycled spent automotive or
truck tires, and similar sources of
waste rubber (sometimes known as "
crumb rubber"), ground or recycled into particles having a mesh size of from 10 to 30 (i.e., approximately from about 500 to about 1000 microns).