Aluminates and Zircoaluminates

Use of aluminates is in its infancy and there is very little information available concerning the nature of the products and their effects other than that they are chemically modified alkoxy aluminium chelates. Their use is being pioneered by Kenrich Petrochemicals [81]. 

Zirco-alnminates have been available for several years, bnt do not seem to have made mnch headway in the particnlate fillers area. Again stmctnral details and useful scientific data is scarce. They are said to be based on a low molecular weight zirco-aluminate backbone carrying two ligand types. One type confers hydrolytic stability to the backbone, while the other contribntes organo-functionality. A nnmber of functionalities are possible inclnding methacryloxy, mercapto, and amino. 

While described as coupling agents, the main benefits illustrated appear to be in dispersion and especially in producing low viscosity filler dispersions of excellent stability in liquid systems such as unsaturated polyester resin. Among the advantages claimed are the ability to produce hydrolytically stable coatings easily and rapidly with aqueous slurries of particulate fillers including calcium carbonate. The reader is referred to publications by Cohen [90-92] for more details. 

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Like the chromates, aluminates, and zircoaluminates, the Chartwells cannot be isolated as neat solids (although dry powder forms on a carrier are available). They are claimed to need less aggressive stabilization, and their solutions are chloride free. The solutions can also have pH above seven. 

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