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US 11,629,498 B2Granted
Reinforced breathable sheet
AssigneeOwens Corning Intellectual Capital, LLC
InventorsMartin Vido, Ronald Boisvert, Steve Thaxton
Life of this patent
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Abstract
A non-asphaltic breathable sheet is provided that includes at least one breathable polymer layer and at least one nonwoven layer. The breathable sheet may include an open-mesh reinforcing fabric embedded in a breathable polymer layer. The breathable sheet has an advantageous balance of strength, water resistance, and permeability to water vapor.
Claims15
A breathable sheet comprising:
- a first breathable polymer layer formed from a first breathable polymer composition;
- and
- a first nonwoven layer comprising polymeric fibers disposed on a top surface of the first breathable polymer layer;
- wherein the polymeric fibers of the first nonwoven layer have a diameter of from 10 microns to 50 microns,
- wherein the first breathable polymer layer has an area weight of 10 g/m2 to 50 g/m2 and wherein the first breathable polymer layer forms an outer surface of the breathable sheet,
- wherein the breathable sheet has an area weight of greater than 80 g/m2 to less than 200 g/m2 and a moisture vapor transmission rate of greater than 8 perms to less than 60 perms, and
- wherein the first breathable polymer composition comprises a blend of:
- (i) greater than 40 wt. % of an olefin-acrylate copolymer, based on a total weight of the first breathable polymer composition, the olefin-acrylate copolymer including from 10 wt. % to 40 wt. % acrylate mer units, based on the weight of the olefin-acrylate copolymer;
- and
- (ii) from 0.1 wt. % to 5 wt. % of an ethylene-acrylic ester-maleic anhydride terpolymer, based on the total weight of the first breathable polymer composition.
7 more elements
A breathable sheet comprising:
- a first breathable polymer layer formed from a breathable polymer composition;
- a first nonwoven layer comprising polymeric fibers applied to the first breathable polymer layer;
- wherein the polymeric fibers of the first nonwoven layer have a diameter of from 10 microns to 50 microns,
- wherein the first breathable polymer layer has an area weight of 10 g/m2 to 50 g/m2 and wherein the first breathable polymer layer forms an outer surface of the breathable sheet,
- wherein the breathable sheet has an area weight of greater than 80 g/m2 to less than 260 g/m2 and a moisture vapor transmission rate of greater than 8 perms to less than 60 perms,
- wherein the breathable polymer composition comprises a blend of:
- (i) from 45 wt. % to 70 wt. % of an olefin-acrylate copolymer based on a total weight of the breathable polymer composition, the olefin-acrylate copolymer including from 10 wt. % to 40 wt. % acrylate mer units, based on the weight of the olefin-acrylate copolymer;
- and
- (ii) a random copolymer of ethylene and methyl acrylate;
- and
- wherein the breathable polymer composition has a total polymer content of greater than 90 wt. % based on a total weight of the breathable polymer composition.
8 more elements
A roofing system comprising:
- a metal support structure;
- a breathable sheet disposed on the metal support structure, the breathable sheet comprising:
- a first breathable polymer layer formed from a breathable polymer composition, and
- a first nonwoven layer comprising polymeric fibers applied to the first breathable polymer layer,
- wherein the polymeric fibers of the first nonwoven layer have a diameter of from 10 microns to 50 microns,
- wherein the first breathable polymer layer has an area weight of 10 g/m2 to 50 g/m2,
- wherein the breathable polymer composition comprises a blend of:
- (i) at least 40 wt. % of an olefin-acrylate copolymer based on a total weight of the breathable polymer composition, based on a total weight of the first breathable polymer composition, the olefin-acrylate copolymer including from 10 wt. % to 40 wt. % acrylate mer units, based on the weight of the olefin-acrylate copolymer;
- and
- (ii) at least one of an ethylene-acrylic ester-maleic anhydride terpolymer and a random copolymer of ethylene and methyl acrylate;
- and
- wherein the first breathable polymer composition has a total polymer content of greater than 90 wt. % based on a total weight of the breathable polymer composition and
- wherein the breathable sheet has an area weight of greater than 80 g/m2 to less than 200 g/m2 and a moisture vapor transmission rate of greater than 8 perms to less than 60 perms;
- a layer of insulation disposed on the breathable sheet;
- and
- a standing seam roofing panel situated above the layer of insulation.
13 more elements
Dependencies are inferred from the claim text.