Abstract: A water repellent composition is disclosed which includes a silicone rubber gum polymer or a room temperature vulcanizable polymer in synergistic combination with a second polymer selected from the group consisting of polybutene, linseed oil, phenolic resin, polyurethane, ethylene-propylene diene monomer and acrylic resin, and an organic solvent in which the silicone rubber gum polymer and the second polymer are at least partially soluble therein. The composition may optionally include a mildewicide, a pigment and an inhibitor. The blend ratio of the silicone rubber gum polymer is from 98 to 2% by weight and the ratio of the second polymer is from 2 to 98% by weight, although in a preferred embodiment, the ratio is essentially equal. When polybutene is present, optionally at least a portion is epoxidized.
Abstract: Adhesive compositions are shown made from mixtures of EPDM and halogenated butyl rubber compounds. The mixture may either be dissolved in solvents and applied as adhesive solutions, or they may be incorporated with tackifiers and formed into adhesive tapes. The compositions are particularly useful in adhering strips of EPDM membrane roofing to each other; however, they may also be used as protective coatings and linings.