Thermoplastic roofing membranes for fully-adhered roofing systems

Abstract

A roof system comprising a substrate and thermoplastic membrane adhered to the substrate, where the thermoplastic membrane is characterized, prior to being adhered to the substrate, by a stiffness represented by a flexural modulus of less than 90 MPa, or by a Taber stiffness of less than 15, or by a Shore D hardness of less than 40, or by a combination of a flexural modulus of less than 90 MPa, a Taber stiffness of less than 15, and a Shore D hardness of less than 40.

1 - 15 . (canceled) 
     
     
         16 . A multilayered membrane comprising:
 a top thermoplastic layer forming a top planar surface of the membrane, a bottom thermoplastic layer forming a bottom planar surface of the membrane, and at least one thermoplastic layer disposed between the top thermoplastic layer and the bottom thermoplastic layer, where said at least one thermoplastic disposed between the top thermoplastic layer and the bottom thermoplastic layer includes propylene-based elastomer, and where said top layer is devoid of propylene-based elastomer, where the multilayered membrane is characterized by a Taber stiffness of less than 15.   
     
     
         17 . The multilayered membrane of  claim 16 , where the multilayered membrane further includes a pressure-sensitive adhesive disposed on said bottom thermoplastic layer. 
     
     
         18 . The multilayered membrane of  claim 16 , where the top thermoplastic layer is devoid of propylene-based elastomer. 
     
     
         19 . The multilayered membrane of  claim 16 , where said top thermoplastic layer includes from about 15 to about 50 weight percent magnesium hydroxide, and where said bottom thermoplastic layer include less than 20 weight percent magnesium hydroxide. 
     
     
         20 . The multilayered membrane of  claim 19 , where said at least one thermoplastic layer disposed between top thermoplastic layer and said bottom thermoplastic layer includes from about 25 to about 75 weight percent calcium carbonate. 
     
     
         21 . The multilayered membrane of  claim 20 , where said bottom thermoplastic layer includes from about 25 to about 75 weight percent calcium carbonate. 
     
     
         22 . The multilayered membrane of  claim 21 , where the top layer and the at least one thermoplastic layer disposed between the top thermoplastic layer and the bottom thermoplastic layer are co-extruded layers. 
     
     
         23 . The multilayered membrane of  claim 16 , where said top thermoplastic layer includes from about 20 to about 40 weight percent magnesium hydroxide, and where said bottom thermoplastic layer include less than 10 weight percent magnesium hydroxide. 
     
     
         24 . The multilayered membrane of  claim 23 , where said at least one thermoplastic layer disposed between top thermoplastic layer and said bottom thermoplastic layer includes from about 35 to about 65 weight percent calcium carbonate. 
     
     
         25 . The multilayered membrane of  claim 24 , where said bottom thermoplastic layer includes from about 35 to about 65 weight percent calcium carbonate. 
     
     
         26 . The multilayered membrane of  claim 25 , where the top layer and the at least one thermoplastic layer disposed between the top thermoplastic layer and the bottom thermoplastic layer are co-extruded layers. 
     
     
         27 . The multilayered membrane of  claim 16 , further including a fabric reinforcement. 
     
     
         28 . The multilayered membrane of  claim 16 , where the bottom layer is devoid of propylene-based elastomer. 
     
     
         29 . The multilayered membrane of  claim 16 , where the bottom layer includes a functionalized polymer. 
     
     
         30 . A roof system comprising a multilayered membrane, where the multilayered membrane includes:
 a top thermoplastic layer forming a top planar surface of the membrane, a bottom thermoplastic layer forming a bottom planar surface of the membrane, and at least one thermoplastic layer disposed between the top thermoplastic layer and the bottom thermoplastic layer, where said at least one thermoplastic disposed between the top thermoplastic layer and the bottom thermoplastic layer includes propylene-based elastomer, and where said top layer is devoid of propylene-based elastomer, where the multilayered membrane is characterized by a Taber stiffness of less than 15.   
     
     
         31 . The multilayered membrane of  claim 30 , where the multilayered membrane further includes a pressure-sensitive adhesive disposed on said bottom thermoplastic layer. 
     
     
         32 . The multilayered membrane of  claim 30 , where the top thermoplastic layer is devoid of propylene-based elastomer. 
     
     
         33 . The multilayered membrane of  claim 30 , further including a fabric reinforcement. 
     
     
         34 . The multilayered membrane of  claim 30 , where the bottom layer is devoid of propylene-based elastomer. 
     
     
         35 . The multilayered membrane of  claim 30 , where the bottom layer includes a functionalized polymer.