Patent ID: 7772136

Claim:
A roofing underlayment comprising: a reinforcing layer comprising: an upper surface anti-slip coating layer comprising: a core layer comprising 2% UV stabilizer, 10% Beige pigment, 4% anti-block, 20% low density polyethylene, and 64% h-homopolymer polypropylene; and a skin layer comprising 2% UV stabilizer, 10% Beige pigment, 8% anti-block, 15% low density polyethylene, and 65% S-E/B-S block copolymer compound comprising about 30%-75% by weight styrene-ethylene/butylene-styrene, about 0%-50% by weight resin, and about 0.1%-2% by weight antioxidant/stabilizer/dusting agent; and a lower surface anti-slip coating layer comprising 73.5% thermoplastic olefin resin, 8.0% low density polyethylene, 2% UV stabilizer, 10.5% white masterbatch, and 6% anti-block; wherein the anti-slip coating comprises a styrene and ethylene/butylene-styrene (S-E/B-S) block copolymer, wherein the upper surface anti-slip coating layer has a thickness of about 0.5 mils to 4 mils, wherein the lower surface anti-slip coating layer has a thickness of about 0.5 mils to 4 mils, and wherein the roofing underlayment is embossed with a pattern.