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Mineral-filled roofing membrane compositions and uses therefor

  • US 5,854,327 A
  • Filed: 06/27/1997
  • Issued: 12/29/1998
  • Est. Priority Date: 06/27/1997
  • Status: Expired due to Term
First Claim
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1. A non-black roof sheeting material prepared from a composition of matter consisting essentially of:

  • 100 parts by weight of at least one polymeric rubber selected from the group consisting of ethylene-propylene-diene terpolymers, ethylene-propylene copolymers and other polyolefinic type polymers;

    from about 20 to about 300 parts by weight of a blend of at least two mineral fillers, per 100 parts of said polymeric rubber, wherein one of said mineral fillers is a reinforcing silica and wherein another of said mineral fillers is a clay surface modified with a polyfulctional silane couling agent;

    from about 20 to about 150 parts by weight of a processing oil per 100 parts of said polymeric rubber;

    from about 1 to about 6 parts by weight of a sulfur cure package having at least one accelerator but being devoid of any thiuram accelerators, said cure package allowing said sheeting material to cure at about the same rate as a carbon black reinforced roof sheeting material at 160°

    C.

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