The applicants discovery of the improved chemical stability of resins and {HEAD ~ resin precursors} provided by the anion (x F) also provides {TAIL ~ means} for improving fluoride bearing polymerizable monomers generally, for example including the ester based monomers described in the above cited Rawls et al. patents 
The applicants discovery of the improved chemical stability of resins and { HEAD ~ resin precursors } provided by the anion ( x F ) also provides { TAIL ~ means } for improving fluoride bearing polymerizable monomers generally , for example including the ester based monomers described in the above cited Rawls et al . patents
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