Basic calcium aluminum hydroxy phosphites, a process for their production and their use
AssigneeBarlocher GmbH
InventorsCoriolan Razvan, Reinhard Beck, Alfred Kurzinger, Michael Rosenthal, Albert W. Purzer
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Abstract
The invention describes basic calcium aluminum hydroxy phosphites of the general formula Ca.sub.x Al.sub.2 (OH).sub.2(x+3-y) (HPO.sub.3).sub.y.mH.sub.2 O wherein x=2-12, ##EQU1## and m=0-12, with the proviso that y.noteq.1, if x=2-8. The compounds according to the invention are particularly suited as stabilizers for halogen-containing polymers, in particular PVC.
Claims8
A basic calcium aluminum hydroxy phosphite compound represented by the general formula:
- Ca.sub.x Al.sub.2 (OH).sub.2(x+3-y) (HPO.sub.3).sub.y. mH.sub.2 O
- wherein
- x is 3 to 12;
- ##EQU3## with the proviso that y.noteq.1 if x=3 to 8;
- and m is 0 to 12.
A process for the production of basic calcium aluminum hydroxy phosphite compounds comprising reacting a mixture of calcium hydroxide and/or oxide, aluminum hydroxide and sodium hydroxide or of calcium hydroxide and/or oxide and sodium aluminate with phosphorous acid in amounts corresponding to those required to produce basic calcium aluminum hydroxy phosphite compounds having the general formula:
- Ca.sub.x Al.sub.2 (OH).sub.2(x+3-y) (HPO.sub.3).sub.y.mH.sub.2 O
- wherein x is 3 to 12;
- ((2x+5)/2 )>y >0 with the proviso that y.noteq.1 if x=3 to 8;
- and m is 0 to 12, in an aqueous medium, and separating and recovering said basic calcium aluminum phosphite compounds.
Dependencies are inferred from the claim text.