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Modified bituminous composition for roof membranes

  • US 6,579,921 B1
  • Filed: 09/24/2001
  • Issued: 06/17/2003
  • Est. Priority Date: 01/27/1999
  • Status: Expired due to Fees
First Claim
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1. A roofing membrane having cold flexibility below about −

  • 20°

    C. and high flow resistance above about 110°

    C., comprising a matrix-filled fibrous substrate and a filled elastomer-modified bituminous composition comprising about 10 to about 30 wt % of said composition of a mineral filler and a bituminous composition comprising bitumen and about 8 to 13 wt % of said bitumen of an elastomer having a conjugated diene structure cross-linked to an extent to permit a reduction of about 10 to 20 wt % in the amount of elastomer in the bituminous composition for the same low and high temperature properties or a concomitant improvement in low and high temperature properties at the same amount of elastomer.

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