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