Peel and stick roofing membranes with cured pressure-sensitive adhesives

Abstract

A membrane composite comprising a polymeric membrane panel, an adhesive layer, and a release member, where the adhesive layer is a pressure-sensitive adhesive that is at least partially cured, and where the adhesive layer has a thickness of at least 102 μm

What is claimed is: 
     
         1 . A roofing membrane composite comprising:
 (i) a polymeric membrane panel for providing a weatherproof polymeric barrier to a building structure, said panel having first and second planar surfaces; and   (ii) a pressure-sensitive adhesive layer disposed on said first planar surface, said pressure-sensitive adhesive being formed by applying a layer of curable hot-melt adhesive composition to said first planar surface and then at least partially curing the adhesive composition.   
     
     
         2 . The roofing membrane composite of  claim 1 , where the curable hot-melt adhesive composition includes a polyacrylate elastomer. 
     
     
         3 . The roofing membrane composite of  claim 1 , where the curable hot-melt adhesive is a polyacrylate including one or more units defined by the formula 
       
         
           
           
               
               
           
         
       
       where each R 1  is individually hydrogen or a hydrocarbyl group and each R 2  is individually a hydrocarbyl group. 
     
     
         4 . The roofing membrane composite of  claim 2 , where the polyacrylate elastomer has a Tg of less than 0° C. 
     
     
         5 . The roofing membrane composite of  claim 3 , where the polyacrylate has a Tg of less than 0° C. 
     
     
         6 . The roofing membrane composite of  claim 4 , where the polyacrylate elastomer has a number average molecular weight from about 100 to about 350 kg/mole. 
     
     
         7 . The roofing membrane composite of  claim 5 , where the polyacrylate has a number average molecular weight from about 100 to about 350 kg/mole. 
     
     
         8 . The roofing membrane composite of  claim 4 , where the polyacrylate elastomer has a Brookfield viscosity at 150° C. of from about 20,000 to about 70,000 cps. 
     
     
         9 . The roofing membrane composite of  claim 5 , where the polyacrylate has a Brookfield viscosity at 150° C. of from about 20,000 to about 70,000 cps. 
     
     
         10 . The roofing membrane composite of  claim 2 , where the curable hot-melt adhesive composition further includes at least one of a photo initiator, solvent, plasticizer, and resin. 
     
     
         11 . The roofing membrane composite of  claim 3 , where the polyacrylate includes one or more units that serve as photo initiators. 
     
     
         12 . The roofing membrane composite of  claim 11 , where the one or more units that serve as photo initiators include acetophenone or benzophenone derivatives. 
     
     
         13 . The roofing membrane composite of  claim 1 , where the curable hot-melt adhesive composition is thermally processable before at least partially curing the composition, and where said pressure-sensitive adhesive layer is not thermally processable as a result of being at least partially cured. 
     
     
         14 . The roofing membrane composite of  claim 1 , where the pressure-sensitive adhesive layer is essentially free of a curative residue. 
     
     
         15 . The roofing membrane composite of  claim 1 , where the pressure-sensitive adhesive layer has a thickness of at least 102 μm. 
     
     
         16 . The roofing membrane composite of  claim 13 , where the pressure-sensitive adhesive layer has a thickness of at least 102 μm. 
     
     
         17 . The roofing membrane composite of  claim 1 , where the membrane is a thermoset EPDM Membrane. 
     
     
         18 . The roofing membrane composite of  claim 1 , where the membrane is a thermoplastic membrane. 
     
     
         19 . The roofing membrane composite of  claim 1 , where the curable hot-melt adhesive composition is cured by UV radiation. 
     
     
         20 . The roofing membrane composite of  claim 1 , where the composite further includes a release liner.