THERMOPLASTIC POLYURETHANE ELASTOMERS AND POLYUREA ELASTOMERS

摘要

(A) preparing a polyol having a molecular weight of about 2,000 to about 8,000 and an unsaturation of terminal groups of 0.02 meq or less per gram of polyol in the presence of a double metal cyanide catalyst, (b) reacting the polyol with a diisocyanate Preparing a terminating initial polymer and (C) reacting the isocyanate terminating initial polymer with a bifunctional isocyanato reactive chain extender in a mold or extruder, such that Shore A hardness is about 50 and Shore D hardness is about 65 A method for producing a thermoplastic elastomer, characterized in that it comprises the step of preparing an elastomer characterized in that. Also claimed are elastomers made by the process using one-shot techniques.