Patent ID: 6572970
Filing Date: 2003-06-03
Classification: B05D,B29C,B29K,C08J,C09K,Y10T

Abstract:
A process for producing a planar thermoplastic molding having a water-spreading coating on at least one side of said molding, said process comprising:(i) preparing a planar thermoplastic molding by means of extrusion; (ii) cooling said planar thermoplastic molding; (iii) applying an aqueous based coating composition onto at least one side of the cooled planar thermoplastic molding, said coating being applied by means of an application roll immediately after production of said planar thermoplastic molding; (iv) drying the applied coating on said planar thermoplastic molding at a temperature from room temperature to 80Â° C.; and (v) annealing the dried coating of step (iv) at a temperature of 90Â° C. to 155Â° C., wherein said aqueous coating composition comprises,A) 0.005 to 2 parts by weight of a compound represented by general formula (1), for which,R1 is a C1-C30 hydrocarbon radical, R2 is hydrogen or a C1-C6 hydrocarbon radical, A is a single bond or a divalent C1-C30 hydrocarbon radical, B is a single bond or a divalent C1-C30 hydrocarbon radical, n is 1, 2, 3 or 4, and Mn+ is a cation having an n-fold positive charge, B) 1 to 20 parts by weight of at least one water-insoluble oxide of a metal or of a semimetal, C) 80 to 100 parts by weight of a mixture of an acid and water, more than 90% of which consists of water, provided that the pH of said aqueous coating composition is less than 6.