Roofing membrane
AssigneeBuilding Materials Investment Corporation
InventorsLouis Lynn Grube, George Manuel Adao, Krishna Venkataswamy
Life of this patent
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Abstract
This invention relates to a roofing or siding membrane comprising a non-woven mat coated with an asphaltic composition containing, in addition to 35-75 wt. % bitumen, a mixture of isotactic and amorphous propylene polymers and between about 0.08 and about 15 wt. % of a functionalized, olefin polymer to provide a non-staining membrane of high tensile strength, low polyolefin content with respect to asphalt, improved compatibility between asphalt and non-functionalized polymers and reduced light end asphalt and polymer exudates. The invention also relates to a method for preparing the membrane.
Claims13
A roofing or siding membrane comprising a non-woven mat on which is coated a composition containing, by weight:
- (a) between about 35 and about 85% asphalt;
- (b) between about 1 and about 15% isotactic C2 to C3 olefin polymer;
- (c) between about 5 and about 50% amorphous C2 to C3 olefin polymer;
- (d) between about 0.08 and about 15% of a functionalized α-olefin homo-, co- or ter-polymer selected from the group consisting of a C2 to C3 olefin homopolymer, a co- or ter-polymer of a C2 to C3 olefin monomer and a C4 to C10 olefin comonomer and a mixture of said functionalized α-olefins;
- (e) 1-10% of a non-functionalized ethylene and/or propylene polymer with a C4 to C12 α-olefin comonomer and
- (f) 0 to about 50% of a filler.
Dependencies are inferred from the claim text.