Patent ID: 8410206

Claim:
A method for stabilizing light-sensitive organic polymers against degradation by free radicals that are generated by photochemical, thermal, physical and/or chemical induction or by exposure of the polymers to UV light, where the polymers that are to be stabilized are components of a lacquer, a varnish, or a coating compound, and where the method includes the step of adding at least one inorganic radical trap to the polymers in combination with at least one UV-absorber or at least one additional radical trap, where the weight ratio of cerium dioxide to the at least one UV-absorber or the at least adding at least one inorganic radical trap to the polymers in combination with at least one UV-absorber or at least one additional radical trap, where the at least one inorganic radical trap includes cerium dioxide (CeO 2 ) in the form of discrete particles that consist exclusively of cerium dioxide and that have particle sizes in the range from 0.005 to 150 μm; the weight ratio of cerium dioxide to the at least one UV-absorber or the at least one additional radical trap, with respect to the combination of cerium dioxide and the at least one UV-absorber or the at least one additional radical trap, is in the range from 1:99 to 20:80; and where the combination of cerium dioxide and the at least one UV-absorber or the at least one additional radical trap is used in an amount of from 0.5 to 15 wt % with respect to the polymers that are to be stabilized, said amount being effective to stabilize the light-sensitive organic polymers against degradation by said free radicals.