Back to results
US 8,453,405 B2Granted
Waterproofing membrane
AssigneeW. R. Grace & Co.-Conn.
InventorsRobert A. Wiercisnki, Hongmei Ding, Xia Cao
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeW. R. Grace & Co.-Conn.
InventorsRobert A. Wiercisnki, Hongmei Ding, Xia Cao
Estimating the term…
Disclosed is a waterproofing membrane that bonds to concrete cast against it (i.e., post-cast concrete). The membrane includes a flexible carrier sheet, a pressure sensitive adhesive and reflective particles on the surface of the adhesive. The reflective particles should have an average diameter equal to or greater than the thickness of the pressure sensitive adhesive. Preferably, the reflective particles are ground white cement, ground hydrated white cement, ground partially-hydrated white cement or a mixture of two or more of these. The membrane does not have a removable release sheet that is typically used to prevent the adhesive portion of the membrane from adhering to the carrier sheet or other portion of the membrane when the membrane is rolled up.
A waterproofing membrane consisting of a flexible carrier sheet with two opposed surfaces, an approximately uniform layer of a waterproofing pressure sensitive adhesive on one surface of the carrier sheet such that the pressure sensitive adhesive has an average thickness in the range of 75 μm to 500 μm and has an outer exposed surface, and substantially reflective inorganic particles adhered directly to the outer exposed surface of the pressure sensitive adhesive, wherein the substantially reflective inorganic particles have an average diameter of about 100 μm to about 600 μm that is approximately equal to or greater than the average thickness of the pressure sensitive adhesive layer, wherein the substantially reflective particles cover approximately 80% to 100% of the outer exposed surface of the pressure sensitive adhesive so as to provide the membrane with a substantially reflective surface that exhibits a whiteness value greater than 65%, and wherein the waterproofing membrane does not include a removable release sheet.
A waterproofing membrane consisting essentially of a flexible carrier sheet with two opposed surfaces, an approximately uniform layer of a waterproofing pressure sensitive adhesive on one surface of the carrier sheet such that the pressure sensitive adhesive has an average thickness in the range of 75 μm to 500 μm and has an outer exposed surface, and substantially reflective inorganic particles adhered directly to the outer exposed surface of the pressure sensitive adhesive, wherein the substantially reflective inorganic particles comprise ground white cement, ground hydrated white cement, ground partially-hydrated white cement or a mixture of two or more of these, wherein the substantially reflective inorganic particles have an average diameter of about 100 μm to about 600 μm that is approximately equal to or greater than the average thickness of the pressure sensitive adhesive layer, wherein the substantially reflective particles cover approximately 80% to 100% of the outer exposed surface of the pressure sensitive adhesive so as to provide the membrane with a substantially reflective surface that exhibits a whiteness value greater than 65%, and wherein the waterproofing membrane does not include a removable release sheet.
Dependencies are inferred from the claim text.