| abstract |
Large-volume elastic blocks consist of a polymer prepared by reacting hydroxyl-terminated polybutadiene-terminated polybutadiene polymers and / or their hydrogenated products and / or hydroxyl-terminated butadiene copolymers with, for example, acrylonitrile, and / or hydroxyl-terminated polyethers and polyisters with diisocyanates, for debonders and crosslinkers having a molar ratio of the sum of all active amine, hydrozamine, and hydroxyl groups to isocyanate groups of 0.8 to 1.05: 1 to 1.2. The blocks may consist of layers of different polymer. The polymer may be filled with carbon black, inorganic filler, rubber pulp, wood waste, and the like in an amount of up to 2,500 wt. per 100 wt. d. polymer. The method of producing the blocks is a one-stage or two-stage process, with a mixing temperature of 15 to 100 ° C. 15 to 200 ° C and sieving 15 to 200 ° C without pressure or up to 0.5 MPa. |