Abstract: This invention relates to polyurethane elastomers and to a process for their production. These elastomers comprise the reaction product of a (cyclo)aliphatic isocyanate component having an NCO group content of about 20 to about 45%, with an isocyanate-reactive component comprising one or more polyether polyols which is free of amine groups, and a low molecular weight organic compound containing two hydroxyl groups and which is free of amine groups, in the presence of one or more catalysts.

Abstract: The present invention is directed to polyisocyanate addition compounds which i) are substantially free from isocyanate groups and are prepared from one or more a) polyisocyanate adducts and/or b) NCO prepolymers, ii) contain urethane groups, iii) contain fluorine in an amount of 0.01 to 50% by weight, and iv) contain ethylenically unsaturated groups in an amount of 2 to 40% by weight, wherein the preceding percentages are based on the solids content of the polyisocyanate addition compounds. The fluorine is incorporated by reacting an isocyanate group with a compound containing two or more carbon atoms, one or more hydroxyl groups and one or more fluorine atoms to form urethane and optionally allophanate groups. More than 50 mole % of the groups that incorporate fluorine into the addition compounds are urethane groups. The polyisocyanate addition compounds are useful in coating compositions that are curable by free radical polymerization.

Abstract: High friction and radar attenuating coating formulations are provided and include a resin matrix, a particulate friction additive dispersed in the resin matrix in an amount sufficient to achieve a minimum coefficient of friction according to MIL-PRF-24667B(SH), and a particulate dielectric filler dispersed in the resin matrix in an amount sufficient to achieve a permitivitty (??) of less than about 10 and a loss tangent (tan ?) of less than about 0.05. A substrate surface may be coated with the coating formulation so as to provide a topcoat layer thereon. The topcoat layer may thus be applied directly onto the substrate surface. Alternatively, the coating formulation is present as a topcoat layer component of a coating system on the substrate which further comprises an intermediate layer interposed between the topcoat layer and a surface of the substrate and/or a primer layer coated directly onto the surface of a substrate between the topcoat layer and the substrate.