The curing composition 1, wherein the component is tin carboxylate which is a non organotin compound and in which the carbon atom adjacent to {HEAD ~ the carbonyl group} is {TAIL ~ a quaternary carbon atom} 
is
The curing composition 1 , wherein the component is tin carboxylate which is a non organotin compound and in which the carbon atom adjacent to { HEAD ~ the carbonyl group } is { TAIL ~ a quaternary carbon atom }
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 HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL