While, as pointed out above, {HEAD ~ the effective TFSA} may be derived from {TAIL ~ a wide variety} of chemical reactants and may contain numerous different groups or moieties, I have found that particularly effective products are those which are described as an acylated polyether polyol having the formula: ##STR4## wherein: A is an alkylene oxide group, Ci H2i O  
While , as pointed out above , { HEAD ~ the effective TFSA } may be derived from { TAIL ~ a wide variety } of chemical reactants and may contain numerous different groups or moieties , I have found that particularly effective products are those which are described as an acylated polyether polyol having the formula : # # STR4 # # wherein : A is an alkylene oxide group , Ci H2i O
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