Among the light stabilizers enjoying great commercial success is bis(2,2,6,6-tetramethylpiperidin-4-yl) sebacate, TINUVIN 770, available from CIBA-GEIGY Corporation. The preparation of this sebacate ester is described in U.S. Pat. No. 3,640,928 by the reaction of 2,2,6,6-tetramethylpiperidin-4-ol with an appropriate sebacic acid derivative.
Isolation and purification of the desired sebacate ester by conventional crystallization methods leads to a product obtained as friable thin flakes with severe dusting problems. While this dusting propensity in no way affects adversely the light stabilization efficacy of this sebacate ester, it does lead to severe handling problems, potential health hazards and related economic barriers to the full realization of the economic potential of this effective light stabilizer in practical use.