| abstract |
One embodiment of the present invention, a friable composition is formed by hydroxyl terminated polymers which are coupled by diisocyantes in which the equivalent ratio of the isocyanate groups to the hydroxyl groups is from about 0.9 to about 1.2. Catalysts which promote isocyanate coupling are utilized. A compounding ingredient such as curing agents, reinforcers, moisture scavengers, accelerators and the like, is added to the above mixture so that upon coupling, a gelled friable composition is formed. The method relates to a compounding ingredient which is added to a gelling dispersant system comprising a coupling system such as a diisocyanate and a reactive hydroxyl terminated polymer with usually a small amount of catalysts, blending the materials to form a uniform mixture, and producing a gelled mass upon coupling so that a good dispersion of the compounding ingredient is obtained. A friable product is produced in situ. |