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