The elastomeric polyurethane interpenetrating network compositions of theinvention are developed by in situ reaction of polyols with differentisocyanates and polyisocyanates in bituminous material. (2) Suitablebituminous materials include asphalt, coal tar, polymer modified asphalt,oxidized, and unoxidized asphalt. (3) The composition is preferably formed ata temperature between 200 ~ F and 350 ~F. The reaction kinetics can beaccelerated by including catalysts and curing agents. (4) The bituminouspolyurethane interpenetrating network elastomeric compositions were hot-sprayed-applied (200 ~F-350 ~F) on concrete, metal, wood, built-up roofingsystems, polyurethane foams, and other construction materials with a speciallydesigned spray applicator system. (1) The coated substrates were evaluated fortheir physical and mechanical properties, adhesion, static and dynamicpuncture resistance, wind-up lift test, and other properties. Bituminouspolyurethane interpenetrating network elastomers are suitable for roofing, newconstruction, and wall and foundation waterproofing applications (7).
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