The curable composition 1, wherein the organopolysiloxane is a reaction product of a mixture comprising a compound of Formula 5; and {HEAD ~ an organopolysiloxane} represented by {TAIL ~ an average composition formula} of Formula 6 or 7: 
represented by
The curable composition 1 , wherein the organopolysiloxane is a reaction product of a mixture comprising a compound of Formula 5 ; and { HEAD ~ an organopolysiloxane } represented by { TAIL ~ an average composition formula } of Formula 6 or 7 :
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 REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH