Importance

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Abstract

The invention relates to a stabilizer system comprising a thermal stabilizer and a supported, at least partly calcined dolomite of the formula Mt¹X¹*CaX² where Mt¹=Mg or Zn; X¹=O or (OH)₂; X²=O; (OH)₂ or CO₃, wherein the calcined dolomite has been supported with a metal perchlorate of the formula Mt²(ClO₄)_m*nH₂O where Mt²=Li, Na, K, Mg, Ca, Ba, Zn, Al, La, Ce; m=1, 2 or 3, m being selected so as to compensate for the charge of the metal ion Mt²; n=0 to 3 and wherein the stabilizer system does not comprise any of the compounds selected from the group consisting of (B) and (C) when Mt¹ is Mg, and wherein (B) at least one nitrogen-containing organic compound is selected from the group consisting of (B1) and (B2), (B1) being a tert-alkanolamine and (B2) being an enaminone or a urea, and (C) an alkaline earth metal aluminohydroxocarbonate of the formula (C) (M_1−xZn_x)_yAl₂(OH)_4+2y CO₃* zH₂O (C) where M=magnesium or/and calcium; x=0 to 0.5; y=2 to 8 and z=0 to 12. The invention further relates to compositions and articles comprising the stabilizer system, to the use thereof and to processes for production of the supported dolomite.

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First Claim