A composition 1 in which the condensation catalyst is crystalline and is a compound selected from the group consisting of imidazole, {TAIL ~ 1,2 dimethylimidazole}, 1,3 diacetyl 2 imidazolidinone, 1,4 diazabicyclooctane, {HEAD ~ 1,1 cyclopentylidenebis 1H pyrazole}, and 3,5 dimethylpyrazole 1 methanol 
A composition 1 in which the condensation catalyst is crystalline and is a compound selected from the group consisting of imidazole , { TAIL ~ 1,2 dimethylimidazole } , 1,3 diacetyl 2 imidazolidinone , 1,4 diazabicyclooctane , { HEAD ~ 1,1 cyclopentylidenebis 1H pyrazole } , and 3,5 dimethylpyrazole 1 methanol
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH