This article deals with the latent reactive polymers having isocyanate moiety obtained from the radical copolymerization of 2-propenyl isocyanate (2PI) with styrene, 2PI with methyl methacrylate (MMA), and 2-methacryloyloxyethyl isocyanate (MOI) with styrene. The radical copolymerization was carried out in benzene (5.00 M by total monomer) in the presence of AIBN (3.00 mol % of total monomer) at 60 degrees C for 24 h. The isocyanate moiety in each copolymer was stable at room temperature for more than 6 months under aerobic atmosphere, because no change of the infrared absorption based on isocyanate group of the resulting copolymer at around 2250 cm(-1) was observed. Isocyanate moiety of obtained copolymer (poly(2PI-co-St)) reacted with excess diamines or diols at 80 degrees C in THF solution to afford the crosslinked polymer quantitatively. These results could demonstrate that isocyanate moiety in the copolymers showed thermal and reactive latency. (c) 2006 Wiley Periodicals, Inc.