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Synthesized hidden macrodiisocyanate (MDI) based on hydroxyl-containing oligodienes and blocking agent - p-hinondioksym. The evaluation of the thermal stability of hidden MDI by method thermogravimetrical analysis. The influence modifier - hidden MDI on the physico-mechanical characteristics and structural features of composite materials, obtained on the basis of dispersed rubber crumb and hydroxyl-containing copolymer of ethylene with vinyl acetate have been investigated. The effective concentration of a hidden MDI and its influence on mechanical and deformation characteristics polymer composites have been determined. Shows that the use of hidden MDI as a modifier to the mentioned above composite, leads to the improvement of their strength characteristics. [ABSTRACT FROM AUTHOR]