Extrudable pressure sensitive adhesive composition and methods for preparing the same

1. A method for producing a polymer blend that includes butyl rubber and polyurethane, the method comprising:

i. providing a masterbatch composition that is prepared by combining a halogenated butyl rubber with at least one unfunctionalized phenolic resin, to form a partially crosslinked butyl rubber;

ii. introducing the masterbatch composition and, optionally, additional unfunctionalized phenolic resin to a reactor;

iii, introducing an isocyanate and a polyurethane catalyst to the reactor containing the masterbatch composition; and

iv. subjecting the reactor to conditions sufficient to form a polyurethane in the presence of the partially crosslinked butyl rubber, thereby forming a polymer blend of butyl rubber and polyurethane.

2. The method of claim 1 , where the isocyanate is a diisocyanate.

3. The method of claim 1 , where the polyurethane is in the form of discreet domains within a matrix formed by the butyl rubber up to temperatures of at least 100° C.

4. The method of claim 1 , where the polyurethane is in the form of discrete domains within a matrix formed by the butyl rubber up to temperatures of at least 120° C.

5. The method of claim 1 , further comprising the step of introducing an oil to the reactor.

6. The method of claim 1 , further comprising the step of introducing a tackifier resin to the reactor.

7. The method of claim 1 , where the polyurethane is cocontinuous with the butyl rubber at temperatures above 120° C.