Propylene-Based Elastomer Compositions for Waterproof Applications Underground

A waterproof membrane, comprising:

• 40 wt % to 60 wt % of at least one propylene-based elastomer, based on the total weight of the blend composition, the at least one propylene-based elastomer having a heat of fusion less than about 80 J/g as determined by DSC, a density of 0.850 g/cm3 to 0.920 g/cm3 per ASTM D-1505, crystallinity of 2% to 65% of isotactic polypropylene and a melting point (Tm) of 100° C. or less, wherein the propylene-based elastomer comprises greater than 50 wt % propylene and from about 3 wt % to about 25 wt % units derived from ethylene, based on a total weight of the propylene-based elastomer;
• and
• 40 wt % to 60 wt % of at least one impact copolymer, based on the total weight of the blend composition, the at least one impact copolymer comprising a propylene homopolymer blended with a propylene copolymer, wherein the at least one impact copolymer has a total propylene-derived unit content of from about 88 to about 92 wt %, based on the weight of the ICP;
• wherein the waterproof membrane has a thickness of 0.9 mm to 1.5 mm, a Tensile Force (N/50 mm) MD and TD of at least 600, as measured by GB/T328.9-2007, and a Tensile Strength (MPa) MD and TD of at least 12, as measured by GB/T328.9-2007.

A waterproof membrane, comprising:

• 40 wt % to 60 wt % of at least one propylene-based elastomer, based on the total weight of the blend composition, the at least one propylene-based elastomer having a heat of fusion less than about 80 J/g as determined by DSC, a density of 0.850 g/cm3 to 0.920 g/cm3 per ASTM D-1505, crystallinity of 2% to 65% of isotactic polypropylene and a melting point (Tm) of 100° C. or less, wherein the propylene-based elastomer comprises greater than 50 wt % propylene and from about 3 wt % to about 25 wt % units derived from ethylene, based on a total weight of the propylene-based elastomer;
• and
• 40 wt % to 60 wt % of at least one impact copolymer, based on the total weight of the blend composition, the at least one impact copolymer comprising a propylene homopolymer blended with a propylene copolymer, wherein the at least one impact copolymer has a total propylene-derived unit content of from about 88 to about 92 wt %, based on the weight of the ICP;
• and
• 1 wt % to 5 wt % of a masterbatch comprising one or more anti-oxidants and one or more anti-agents,
• wherein the waterproof membrane has a thickness of 0.9 mm to 1.5 mm, a Tensile Force (N/50 mm) MD and TD of at least 600, as measured by GB/T328.9-2007, a Tensile Strength (MPa) MD and TD of at least 12, as measured by GB/T328.9-2007, an elongation @beak (%) MD and TD of at least 500 as measured by GB/T328.9-2007, a tear strength around nail (N) MD and TD of at least 400 as measured by GB/T 328.18, and a puncture strength (N) of at least 180 as measured by CJ/T 234-2006.