Metal carboxylate clays, derivatives of metal carboxylate clays, methods for making the same, and compositions containing the same
OwnerRaymond L. Nipinventor
Life of this patent
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Abstract
Zinc carboxylate clays and zinc carboxylate organoclays, methods for their preparation, and compositions containing the same are disclosed. The methods comprise either mixing a zinc clay composition with a carboxylic acid, or mixing a carboxylic acid with a zinc ammonia complex solution, then combining the resulting zinc carboxylate salt with a slurry or suspension of a cation-exchangeable clay, to prepare the zinc carboxylate clay. These clays can be further intercalated with quaternary ammonium salts to make zinc carboxylate organoclays. The present clays may be used in compositions and/or as additives in rubber and plastic formulations and products and in catalyst formulations.
Claims21
A method for preparing a zinc carboxylate clay, comprising:
- a) mixing (i) a zinc source comprising a zinc ammonia carbonate solution with (ii) a cation-exchangeable clay having a cation exchange capacity of from 50 milliequivalents per 100° rams of clay to about 150 milliequivalents per 100 grams of clay to form a zinc-containing cation exchangeable clay;
- b) mixing (i) a carboxylic acid or an ammonium salt of the carboxylic acid with (ii) the zinc-containing cation exchangeable clay to form a zinc-carboxylic acid clay composition, wherein at least 50 milliequivalents of zinc per 100 grams of the zinc-containing cation exchangeable clay are insoluble in an aqueous solution of ammonia and carbon dioxide;
- c) milling the zinc-carboxylic acid clay composition;
- d) heating the zinc-carboxylic acid clay composition under conditions sufficient to intercalate the carboxylic acid into the zinc-containing cation exchangeable clay and form the zinc carboxylate clay;
- and
- e) optionally milling the zinc carboxylate clay.
A method for preparing a zinc carboxylate clay, comprising:
- a) mixing (i) a carboxylic acid and (ii) a zinc ammonia carbonate complex solution to form a zinc carboxylate solution;
- b) adding a cation exchangeable clay having a cation exchange capacity of from 50 milliequivalents per 100 grams of clay to about 150 milliequivalents per 100 grams of clay into the zinc carboxylate solution to form a mixture, and mixing the mixture until the zinc carboxylate clay coagulates and precipitates;
- c) optionally heating the mixture to drive out the ammonia and carbon dioxide;
- d) optionally attrition milling the mixture to form the zinc carboxylate clay;
- and
- e) washing, filtering, drying and milling the zinc carboxylate clay.
Dependencies are inferred from the claim text.