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 . 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.   
     
     
         2 . The roof system of  claim 1 , where the substrate is selected from the group consisting of a roof deck, an insulation board, a cover board, and an existing membrane. 
     
     
         3 . The roof system of  claim 1 , where the thermoplastic membrane includes first and second opposed planar surface with one of the opposed planar surfaces being adhered to the substrate. 
     
     
         4 . The roof system of  claim 1 , where at least 50% of the at least one planar surface of the membrane is adhered to the substrate. 
     
     
         5 . The roof system of  claim 1 , where the membrane is adhered to the substrate through a polyurethane adhesive. 
     
     
         6 . The roof system of  claim 1 , where the membrane is adhered to the substrate through a pressure-sensitive adhesive. 
     
     
         7 . The roof system of  claim 1 , where the membrane includes one or more layers, and where at least one layer includes a propylene-based elastomer. 
     
     
         8 . The roof system of  claim 1 , where the membrane is characterized by a flexural modulus of less than 90 MPa. 
     
     
         9 . The roof system of  claim 1 , where the membrane is characterized by a Taber stiffness of less than 15. 
     
     
         10 . The roof system of  claim 1 , where the membrane is characterized by a Shore D hardness of less than 40. 
     
     
         11 . The roof system of  claim 1 , where the membrane is characterized by a flexural modulus of less than 70 MPa. 
     
     
         12 . The roof system of  claim 1 , where the membrane is characterized by a Taber stiffness of less than 8. 
     
     
         13 . The roof system of  claim 1 , where the membrane is characterized by a Shore D hardness of less than 20.