Preferred polyesters have {TAIL ~ the formula}; ##STR1## wherein each R1 is {HEAD ~ a 1,4 phenylene moiety}; the R2 are essentially ethylene moieties, 1,2 propylene moieties or a mixture thereof; each X is ethyl or preferably methyl; each n1 is from 1 to about 5; the sum of each n1 +n2 is from about 12 to about 43; u is from about 3 to about 10 
Preferred polyesters have { TAIL ~ the formula } ; # # STR1 # # wherein each R1 is { HEAD ~ a 1,4 phenylene moiety } ; the R2 are essentially ethylene moieties , 1,2 propylene moieties or a mixture thereof ; each X is ethyl or preferably methyl ; each n1 is from 1 to about 5 ; the sum of each n1 + n2 is from about 12 to about 43 ; u is from about 3 to about 10
OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH