Patent ID: 9133612
Filing Date: 2015-09-15
Classification: C09J,E02D,E04B,Y10T

Abstract:
1. A method of making a waterproofing membrane comprising a waterproofing adhesive (layer A), a carrier sheet (layer B), a releasable bonding material (layer C) and a protective coating (layer D), wherein the membrane does not include a removable release sheet, the method comprising the following steps: (S1) coating the releasable bonding material (layer C) onto the carrier sheet (layer B) and drying; (S2) coating the protective coating (layer D) onto the releasable bonding material (layer C) and drying; (S3) either (i) coating the adhesive (layer A) onto the uncoated face of the carrier sheet (layer B) to provide a waterproofing membrane with laminated layers arranged in the sequential order A-B-C-D; or (ii) coating the adhesive (layer A) onto the protective coating (layer D) to provide a waterproofing membrane with laminated layers arranged in the sequential order B-C-D-A; and (S4) winding the four-layer laminate into a roll with the adhesive (layer A) facing inwards; wherein the coated releasable bonding material (layer C) has a thickness (dry) of 0.1 to 20 μm and comprises a water soluble polymer, an alkali soluble polymer, a homopolymer or copolymer of polyvinyl acetate, or mixture thereof, the coated reasable bonding material (layer C) thereby effective to adhere to the protective coating (layer D) and to releasably adhere to the carrier sheet (layer B); and wherein the membrane in four-layer laminate form does not include a removable release sheet.