Anti-slip roofing underlayment
View Patent ↗A roofing underlayment comprises a reinforcing layer, which is extrusion coated on at least one side with an anti-slip coating layer. Preferably, the reinforcing layer comprises a woven polyethylene or polypropylene scrim. The anti-slip coating layer comprises a compound based on a styrene and ethylene/butylene-styrene, S-E/B-S, block copolymer, such as the compound sold under the trademark KRATON® MD6649. The anti-slip coating layer is low in cost and helps prevent water from penetrating the primary roofing material. In addition, the anti-slip coating layer provides an improved anti-skid surface upon which an individual may safely walk.
1. 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.
2. The roofing underlayment according to claim 1 , wherein the reinforcing layer comprises a woven polyethylene scrim.
3. The roofing underlayment according to claim 1 , wherein the reinforcing layer comprises a woven polypropylene scrim.
4. The roofing underlayment according to claim 1 , wherein the reinforcing layer comprises a nonwoven layer.
5. The roofing underlayment according to claim 1 , wherein:
the reinforcing layer comprises a woven polypropylene scrim;
wherein the core layer and the skin layer are coextruded onto the scrim; and wherein the core layer comprises 70% by weight of the upper coating layer and the skin layer comprises 30% by weight of the upper coating layer.
6. 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;
wherein the reinforcing layer comprises a woven polypropylene scrim;
wherein the core layer and the skin layer are coextruded onto the scrim; and wherein the core layer comprises 70% by weight of the upper coating layer and the skin layer comprises 30% by weight of the upper coating layer.