Multilayered sheet
AssigneeE. I. Du Pont de Nemours and Company
InventorDariusz Wlodzimierz Kawka
Life of this patent
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Abstract
This invention is directed to a multilayered sheet comprising a release paper and an inorganic refractory layer coated onto one surface of the release paper wherein the refractory layer has a dry areal weight of from 15 to 50 gsm and a residual moisture content of no greater than 10 percent by weight. The paper comprises a blend of cellulose and cotton fibers and is hydrophilic.
Claims12
A multilayered sheet comprising a release paper having a first and a second outer surface and an inorganic refractory layer adjacent to at least one surface of the release paper wherein the inorganic refractory layer has a dry areal weight of from 15 to 50 gsm and a residual moisture content of no greater than 10 percent by weight, wherein the release paper
- (i) comprises a blend of cellulose and cotton fibers,
- (ii) is hydrophilic
- (iii) has a wet tensile strength of at least 5 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 10 lb/in in a first direction and at least 5 lb/in in a second direction, the second direction being transverse to the first direction,
- (v) has a surface smoothness on at least one outer surface of no greater than 150 Sheffield units,
- (vi) has a surface release value from at least one outer surface of from 0.25 to 1.5 lb/in,
- (vii) has a thickness of from 5 to 12 mil,
- (viii) has a density of from 0.9 to 1.1 g/cc, and
- (ix) has an air permeability no greater than 1200 Gurley Air Resistance (sec/100cc, 20 oz. cyl.).
Dependencies are inferred from the claim text.