Scrim coated products having a coextruded multi-layer coating on one side thereof
View Patent ↗Protective coverings are disclosed that have a scrim made up of warp and weft members that define a plurality of interstices coated on only a first major surface thereof by a multi-layer coating with a first layer of the multi-layer coating juxtaposed to the first major surface, and penetrating into the interstices of the scrim to co-define, with the warp and weft members, an opposing second major surface of the scrim. The first layer of the multi-layer coating has a melting point below 100° C. and comprises a copolymer of ethylene, and provides the co-defined opposing second major surface of the scrim with a coefficient of friction of at least 0.5 when tested with dry leather and at least 0.7 when tested with dry rubber.
1. A protective covering comprising:
a scrim comprising warp and weft members that define a plurality of interstices, the scrim having a first major surface and an opposing second major surface; and
a multi-layer coating applied to the first major surface of the scrim with a first layer juxtaposed to the first major surface and a core layer on an opposed surface of the first layer relative to the first major surface, the first layer being penetrated into the interstices of the scrim to co-define, with the warp and weft members, the opposing second major surface of the scrim;
wherein the first layer has a melting point below 100° C., and comprises a copolymer of ethylene;
wherein the core layer comprises polypropylene and makes up about 10% to about 90% of a total thickness of the multi-layer coating; and
wherein the co-defined opposing second major surface of the scrim has a coefficient of friction of at least 0.5 when tested with dry leather and at least 0.7 when tested with dry rubber.
2. The protective covering of claim 1 , wherein the copolymer of ethylene comprises, as a copolymer with the ethylene, one or more of propylene, butane, vinyl acetate, and methylacrylate, or is a styrene block copolymer.
3. The protective covering of claim 1 , wherein the multi-layer coating is coextruded onto the scrim.
4. The protective covering of claim 1 , wherein the polypropylene is a homopolymer of polypropylene.
5. The protective covering of claim 4 , wherein the homopolymer of polypropylene has a greater Vicat softening temperature than the copolymer of ethylene.
6. The protective covering of claim 4 , wherein the homopolymer of polypropylene is mixed with a minor amount of low density polyethylene.
7. The protective covering of claim 1 , wherein the core layer further comprises one or more of low density polyethylene, linear low density polyethylene, ethyl vinyl acetate, ethylene methyl acrylate, or copolymers of ethylene in a minor amount relative to the amount of polypropylene in the core layer.
8. The protective covering of claim 1 , wherein the multi-layer coating has an A/B/A or A/B/C construction with a first A layer being the first layer of the multi-layer coating.
9. The protective covering of claim 8 , wherein the second A layer or the C layer has an embossed major outermost surface.
10. The protective covering of claim 1 , wherein the interstices of the scrim define about 10% to about 40% of the surface area of the opposing second major surface of the scrim.
11. The protective covering of claim 1 , wherein the scrim is a woven or knitted material.
12. The protective covering of claim 1 , wherein the plurality of warp and weft members each have a denier value in the range of about 200 to about 2000 denier.
13. The protective covering of claim 1 , wherein the scrim comprises four to twelve warp members and two to eight weft members.
14. The protective covering of claim 1 , wherein the protective covering is lumber wrap or roofing underlayment.
15. The protective covering of claim 1 , wherein the multi-layer coating further comprises, in one or more layers thereof, a UV stabilizer.
16. The protective covering of claim 1 , wherein the polymer present in the core in the greatest amount has a Vicat softening temperature greater than that of the copolymer of ethylene.
17. The protective covering of claim 16 , wherein the Vicat softening temperature of the polymer in the core is greater than 120° C., and a Vicat softening temperature of the first layer comprising the copolymer of ethylene and a polymer of an opposing skin layer, disposed on an opposite side of the core from the first layer, are both less than 80° C.
18. The protective covering of claim 16 , wherein a melting point of the polymer in the core is greater than 120° C., and a melting point of a polymer in a skin layer of the multi-layer coating opposite the first layer relative to the core has a melting point less than 100° C.
19. The protective covering of claim 1 , wherein the copolymer of ethylene has a melt flow rate of about 5 g/10 min to about 50 g/10 min.