USE OF POLYUREA NANOPARTICLES AS PERFORMANCE MODIFIERS IN POLYURETHANE MATERIALS

摘要

Nano-sized polyurea particles or a dispersion of polyurea particles suitable for improving the mechanical properties of a polyurethane material, said particles having at least equivalent diameter dimensions in the nanosize range of 50 nm up to 700 nm, a uniform equivalent diameter particle size distribution, an amount of urethane bonds calculated on the total amount of urea + urethane bonds in said particles of < 1%, and a glass transition temperature (Tg) of >100°C, preferably Tg >120°C, more preferably >150°C measured in a second heating cycle after heating to >220°C at 20° per minute using Differential Scanning Calorimetry.