Patent ID: 8931228
Filing Date: 2015-01-13
Classification: C09J,E01D,E04B,Y10T

Abstract:
1. A waterproofing membrane in the form of a sheet-like laminate, comprising: a carrier sheet having first and second opposing surfaces; a pressure sensitive adhesive layer having first and second opposing surfaces, one of which is adhered on one surface of the carrier sheet; and a protective coating layer having first and second opposing surfaces, one of which is adhered on the surface of the pressure sensitive adhesive layer opposite the surface adhered to the carrier sheet, the protective coating layer comprising (i) a polymer having Tg less than 25° C., (ii) a cement comprising white Portland cement, white aluminate cement or white calcium sulfo-aluminate cement, and (iii) a white pigment, wherein the protective coating layer has a pigment volume concentration of 40% to 90% inorganic solids, based on total solids in the protective coating layer, and a reflectivity ≧55% , measured by a reflectometer perpendicular to a surface illuminated at a 45° angle, the protective coating layer having a coating weight of 40 g/m said waterproofing membrane further comprising a releasable bonding layer on the protective coating layer, wherein the releasable bonding layer comprises a water soluble polymer, an alkali soluble polymer, or a homopolymer or copolymer of polyvinyl acetate, and wherein the polymer is selected from the group consisting of polyvinyl alcohol (PVOH), polyethylene oxide (PEO), water soluble cellulosic polymers including hydroxypropyl methyl cellulose and hydroxyethyl cellulose, hydrolyzed maleic anhydride polymers and copolymers, polyvinylpyrrolidone, sulfonated polystyrene, polysulfoethyl acrylate, poly(2-hydroxyethylacrylate), polyacrylamide, poly(acrylic acid) and alkali metal salts thereof, natural or synthetically modified polysaccharides, proteins, alginates, xanthan gums, and guar gums, styrene maleic anhydride copolymers, copolymers of acrylic acid and styrene and/or alpha-methyl styrene, hydroxypropyl methylcellulose acetate succinate, copolymers of methacrylic acid and methylmethacrylate, acrylic acid-ethyl acrylate-methyl methacrylate copolymer, a copolymer of ethyl acrylate, methylmethacrylate, and acrylic acid, rosin acid, and homopolymers or copolymers of polyvinyl acetate; and wherein said releasable bonding layer further comprises a nanoscale silica in an amount of 30% to 70% by volume of the silica plus polymer, said nanoscale silica having a particle size of 5 nm to 30 nm; and wherein said releasable bonding layer has a coating weight of 1 g/m