Inventors:
Ponswamy Rajalingam - Pompano Beach FL
Umarani Rajalingam - Pompano Beach FL
Assignee:
Urecoats Technologies, Inc. - Pompano Beach FL
International Classification:
C08L 9500
Abstract:
The elastomeric polyurethane interpenetrating network compositions of the invention are developed by in situ reaction of polyols with different isocyanates and polyisocyanates in bituminous material. Suitable bituminous materials include asphalt, coal tar, polymer modified asphalt, oxidized, and unoxidized asphalt. The composition is preferably formed at a temperature between 200. degree. F. and 350. degree. F. The reaction kinetics can be accelerated by including catalysts and curing agents.
The reaction kinetics were followed by measuring the torque increase as a function of reaction time. The gelation time is measured at the maximum torque. For testing, the bituminous polyurethane interpenetrating network elastomeric compositions were hot-sprayed-applied (200. degree. F. -350. degree. F. ) on different substrates such as concrete, metal, wood, built-up roofing systems, polyurethane foams, and other construction materials with a specially designed spray applicator system. The coated substrates were evaluated for their physical and mechanical properties, adhesion, static and dynamic puncture resistance, wind-up lift test, and other properties.