ABRASIVE MEANS, USE OF ALKALI METAL FLUOROALUMINATES OR ALKALINE EARTH FLUOROALUMINATES FOR STABILIZING POLYMERS AGAINST CHANGE IN COLOR BY THE ACTION OF HEAT, AND MIXTURE CONSISTING OF POTASSIUM TETRAFLUOROALUMINATE AND DIPOTASSIUM PENTAFLUOROALUMIN

摘要

The invention relates to an abrasive means with abrasive-active fillers. The abrasive means is comprised, in general, of a support, abrasive grit and of a binder system. In order to improve the abrasive action and the serviceable life of the abrasive means, the binding agent system contains synthetic alkali metal fluoroaluminates and/or alkaline earth metal fluoroaluminates, in particular, alkali metal tetrafluoroaluminate, preferably potassium tetrafluoroaluminate, together with at least one additional abrasive-active filler. The invention also relates to the use of alkali metal fluoroaluminates and/or alkaline earth metal fluoroaluminates, preferably potassium tetrafluoroaluminate and/or dipotassium pentafluoroaluminate for stabilizing polymers against change in color by the action of heat. The invention further relates to a mixture consisting of potassium tetrafluoroaluminate and dipotassium pentafluoroaluminate and of other abrasive-active fillers in a weight ratio of 4:2 to 2:4.