Patent ID: 9441326
Filing Date: 2016-09-13
CPC Classification: B32B,D21H,Y10T

Claim Text:
1. A layered sheet comprising a flame resistant wet-laid nonwoven paper carrier having a first and second surface and an inorganic refractory layer comprising 100 percent platelets of vermiculite adjacent to at least one surface of the nonwoven paper carrier wherein the refractory layer has a dry areal weight of from 15 to 50 gsm, a residual moisture content of no greater than 10 percent by weight and wherein the nonwoven paper carrier (i) comprises from 40 to 70 weight percent of aramid fibers and from 30 to 60 weight percent of polymeric binder, (ii) is hydrophilic (iii) has a wet tensile strength of at least 3 lb/in in a first direction and at least 2 lb/in in a second direction, the second direction being transverse to the first direction, (iv) has a dry tensile strength of at least 7 lb/in in a first direction and at least 3 lb/in in a second direction, the second direction being transverse to the first direction, (v) has an air permeability no greater than 2000 Gurley Air Resistance (sec/25 cc, 20 oz. cyl.), (vi) has a smoothness on at least one surface of no greater than 150 Sheffield units, (vii) has a surface release value from at least one surface of from 0.25 to 0.8 lb/in, (viii) has a thickness of from 0.025 to 0.175 mm, (ix) has a density of from 0.60 to 1.1 g/cc, and (x) has a basis weight of from 20 to 70 gsm, and wherein the layered sheet is a component of a flame barrier for a thermal insulation and acoustic blanket.