ABRASIVE MEANS, USE OF ALKALIMETAL 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 PENTAFLUOROALUMINATE AND OF OTHER ABRASIVE-ACTIVE FILLERS

摘要

The invention relates to an abrasive means with abrasive-active fillers. Theabrasive means is comprised, in general, of a support, abrasive grit and of abinder system. In order to improve the abrasive action and the serviceablelife of the abrasive means, the binding agent system contains synthetic alkalimetal fluoroaluminates and/or alkaline earth metal fluoroaluminates, inparticular, alkali metal tetrafluoroaluminate, preferably potassiumtetrafluoroaluminate, together with at least one additional abrasive-activefiller. The invention also relates to the use of alkali metal fluoroaluminatesand/or alkaline earth metal fluoroaluminates, preferably potassiumtetrafluoroaluminate and/or dipotassium pentafluoroaluminate for stabilizingpolymers against change in color by the action of heat. The invention furtherrelates to a mixture consisting of potassium tetrafluoroaluminate anddipotassium pentafluoroaluminate and of other abrasive-active fillers in aweight ratio of 4:2 to 2:4.