BONDING ADHESIVE AND ADHERED ROOFING SYSTEMS PREPARED USING THE SAME

1 . A method for forming an adhered membrane roof system, the method comprising:

i. applying a bond adhesive composition to a substrate on a roof to form an adhesive layer, where the bond adhesive composition comprises:

a) a polymer having a silicon-containing hydrolyzable terminal group, where the polymer having a silicon-containing hydrolyzable terminal group includes a silane-terminated polymer having a polyether backbone,

b) a hydrocarbon tackifying resin,

c) a plasticizer,

d) optionally, an adhesion promoter selected from the group consisting of non-polymeric silicon-containing hydrocarbon compounds,

e) optionally, a catalyst,

f) optionally, a moisture scavenger,

g) optionally, an antioxidant, and

h) optionally, a thixotropic compound, where the composition is substantially devoid of phenolic resin, and where the composition has a dynamic viscosity of less than 13,000 cPs by using a Brookfield viscometer equipped with a #6 spindle operating at room temperature and 10 rpm and a static viscosity of from about 3600 to about 24,000 cPs by using a Brookfield viscometer equipped with a #6 spindle operating at room temperature and 2 rpm; and

ii. applying an EPDM membrane directly to the adhesive layer.

2 . The method of claim 1 , where the adhesive forms a substantially continuous layer between the substrate and the membrane over at least 40% of the entire substrate.

3 . The method of claim 1 , where said step of applying the adhesive includes dip and roll techniques or spraying the adhesive on the substrate.

4 . The method of claim 1 , where the substrate includes an insulation board, a coverboard, a roofing membrane, or an existing membrane.

5 . The method of claim 4 , where the existing membrane includes an asphalt-based roofing membrane.

6 . The method of claim 1 , where the adhesive layer has a wet film thickness of from about 5 to about 30 mils.

7 . The method of claim 1 , where the bond adhesive composition is applied to the substrate at an application rate of at least 50 square feet per gallon.

8 . The method of claim 1 , where the adhesive layer forms a bond between the substrate and the EPDM membrane that is characterized by a peel strength of at least 2.5 pounds per linear inch, as measured by ASTM D1876.

9 . The method of claim 1 , where the composition has a dynamic viscosity of from about 4,500 to about 11,000 cPs by using a Brookfield viscometer equipped with a #6 spindle operating at room temperature and 10 rpm.

10 . A bond adhesive composition comprising:

a) a polymer having a silicon-containing hydrolyzable terminal group, where the polymer having a silicon-containing hydrolyzable terminal group includes a silane-terminated polymer having a polyether backbone,

b) a hydrocarbon tackifying resin,

c) a plasticizer,

d) optionally, an adhesion promoter selected from the group consisting of non-polymeric silicon-containing hydrocarbon compounds,

e) optionally, a catalyst,

f) optionally, a moisture scavenger,

g) optionally, an antioxidant, and

h) optionally, a thixotropic compound, where the composition is substantially devoid of phenolic resin, and where the composition has a dynamic viscosity of less than 13,000 cPs by using a Brookfield viscometer equipped with a #6 spindle operating at room temperature and 10 rpm and a static viscosity of from about 3600 to about 24,000 cPs by using a Brookfield viscometer equipped with a #6 spindle operating at room temperature and 2 rpm

11 . The composition of claim 10 , where the amount of silane-terminated polymer is from about 25 to about 80 wt. %, based upon the total weight of the composition.

12 . The composition of claim 10 , where the hydrocarbon resin is characterized by a softening point of from about 65° C. to about 170° C.

13 . The composition of claim 10 , where the composition includes from about 1 wt. % to about 30 wt. % of hydrocarbon resin, based upon the total weight of the composition.

14 . The composition of claim 10 , where the composition includes from about 5 wt. % to about 65 wt. % of plasticizer, based upon the total weight of the composition.

15 . The composition of claim 10 , where the composition includes from about 0.1 wt. % to about 3 wt. % of antioxidant, based upon the total weight of the composition.

16 . The composition of claim 10 , where the amount of adhesion promoter, if present, is from about 1 wt. % to about 10 wt. %, based upon the total weight of the composition, where the amount of catalyst, if present, is from about 0.05 wt. % to about 3 wt. %, based upon the total weight of the composition, where the amount of moisture scavenger, if present, is from about 0.25 wt. % to about 5 wt. %, based upon the total weight of the composition, where the amount of antioxidant, if present, is from about 0.1 wt. % to about 3 wt. %, based upon the total weight of the composition, and where the amount of thixotropic compound, if present, is from about 1 wt. % to about 10 wt. %, based upon the total weight of the composition.

17 . The composition of claim 10 , where the polymer having a silicon-containing hydrolysable terminal group includes from about 40 wt. % to about 100 wt. % of a silane-terminated polymer having a molecular weight of greater than 12,000 g/mole, based upon the total weight of the polymer having a silicon-containing hydrolysable terminal group.

18 . The composition of claim 17 , where the polymer having a silicon-containing hydrolysable terminal group includes from at least 20 wt. % of a silane-terminated polymer having a molecular weight of less than 12,000 g/mole, based upon the total weight of the polymer having a silicon-containing hydrolysable terminal group.

19 . The composition of claim 10 , where the composition is devoid of filler.