Compositions of mixed aluminum alkaline-earth metal hydroxide type as antichlorine and antiacid agents for the stabilization of thermoplastic resins
AssigneeElf Atochem S.A.
InventorsDominique Plee, Ludovic Hardouin DuParc
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Abstract
This invention relates to compositions resulting from the reaction, in aqueous phase, of aluminum hydroxide, of alkali metal cation hydroxide and of calcium or strontium hydroxide. The addition of such a composition to PVC resins or to olefinic resins from Ziegler catalysis prevents the degradation of these resins under the effect of light or of heat, in particular during extrusion.
Claims11
A composition for the reduction of chlorine or acidic products in polymeric materials comprising the solid product of a reaction between an aluminum hydroxide and a divalent metal hydroxide selected from the group consisting of calcium hydroxide and strontium hydroxide, wherein the reaction occurs in an aqueous phase and in the presence of a sufficient amount of a hydroxide of an alkali metal to maintain the pH of the aqueous phase at about 13, and wherein the aluminum hydroxide and the divalent metal hydroxide arc reacted at a temperature between about 50.degree. C. and about 90.degree. C., and wherein the molar ratio of the divalent metal to the aluminum is between about 2 and 10.
A thermoplastic resin containing a halogen comprising a composition for the reduction of chlorine or acidic products in the resin comprising the solid product of a reaction between an aluminum hydroxide and a divalent metal hydroxide selected from the group consisting of calcium hydroxide and strontium hydroxide, wherein the reaction occurs in an aqueous phase and in the presence of a sufficient amount of a hydroxide of an alkali metal to maintain the pH of the aqueous phase at about 13, and wherein the aluminum hydroxide and the divalent metal hydroxide are reacted at a temperature between about 50.degree. C. and about 90.degree. C., and wherein the molar ratio of the divalent metal to the aluminum is between about 2 and 10.
An olefinic thermoplastic resin containing acidic compounds comprising a composition for the reduction of chlorine or acidic products in the resin comprising the solid product of a reaction between an aluminum hydroxide and a divalent metal hydroxide selected from the group consisting of calcium hydroxide and strontium hydroxide, wherein the reaction occurs in an aqueous phase and in the presence of a sufficient amount of a hydroxide of an alkali metal to maintain the pH of the aqueous phase at about 13, and wherein the aluminum hydroxide and the divalent metal hydroxide are reacted at a temperature between about 50.degree. C. and about 90.degree. C., and wherein the molar ratio of the divalent metal to the aluminum is between about 2 and 10.
Dependencies are inferred from the claim text.