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Mineral filled EPDM membrane compositions with improved adhesion performance

  • US 5,700,538 A
  • Filed: 09/05/1996
  • Issued: 12/23/1997
  • Est. Priority Date: 03/31/1995
  • Status: Expired due to Fees
First Claim
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1. A laminate seam of rubber sheet material for roofing having improved adhesion performance comprising:

  • two layers of vulcanizable elastomeric roof sheet material, one of said layers at least partially overlapping the other of said layers, said roof sheet material being prepared from a polymeric composition of matter having up to about 2 weight percent crystallinity comprising;

    at least one polymer selected from the group consisting of polyolefins prepared from monomers containing at least 2 carbon atoms and mixtures thereof, said polymer having a crystallinity of up to about 2 percent by weight;

    about 20 to 125 parts by weight of one or more non-black mineral fillers per 100 parts of said polymer;

    about 50 to 110 parts by weight of one or more black-type fillers per 100 parts of said polymer;

    from about 50 to 70 parts by weight of a processing material, per 100 parts of said polymer, said composition of matter being devoid of flame retardant rubber chemical additives, heavy metals, oxidants and halogen-containing polymers; and

    a cure package; and

    an adhesive, selected from the group consisting of neoprene-based and butyl-based adhesives, interposed between the area of overlapping of said layers, said layers of roof sheet material having improved peel adhesion to each other using said adhesive.

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