Crushing, material-reducing, grinding and like machines

摘要

A crushing part or component of a gyratory grinder or other crushing, grinding or material-reducing machine is provided with a shock-absorbing backing material which has improved toughness and resilience and is formed of a filled polyurethane resin composition the resin component of which is derived from a cold-curing system comprising I. AT LEAST ONE POLYETHER POLYOL HAVING MORE THAN 2-OH groups per molecule, II. AT LEAST ONE POLYOL CONTAINING BOTH ESTER AND ETHER GROUPS AND HAVING MORE THAN 2-OH groups per molecule, III. AT LEAST ONE POLYETHER DIOL AND IV. AT LEAST ONE AROMATIC POLYISOCYANATE, THERE BEING AN EXCESS OF CNO groups over -OH groups in the system.