Patent ID: 9097018
Filing Date: 2015-08-04
Classification: B05D,B32B,E04B,E04D,Y10T

Abstract:
1. A method for producing a membrane, the membrane comprising a sealing layer that comprises PVC by more than 50% by weight, relative to the total weight of the sealing layer, and a barrier layer S 1 , wherein the barrier layer is a polyamide layer comprising more than 50% by weight of copolymer PA, relative to the total weight of the polyamide layer which is connected with the sealing layer by a polyurethane layer wherein the polyurethane layer comprises more than 10% by weight of polyurethane PUR, relative to the total weight of the polyurethane layer, the method comprising: (i) applying a polyurethane dispersion composition PD onto a sealing layer, (ii) flashing off the polyurethane dispersion composition PD while forming a polyurethane layer; and (iii) forming a polyamide layer on the polyurethane layer, wherein the copolymer PUR has at least one nucleophilic functional, which is selected from the group consisting of hydroxyl group, carboxyl group, sulfonate group and phosphate group, and wherein the copolymer PA is a copolymer of aliphatic diamine with 4-10 C atoms, dicarboxylic acid with 4-10 C atoms, cycloaliphatic diamine with 6-20 C atoms, and a compound selected from the group consisting of aliphatic lactam with 4-10 C atoms and alpha, omega-amino carboxylic acids with 2-20 C atoms.