Further, after formation of the shells, crosslinking is carried out in the presence of monomers having {HEAD ~ a polymerizable unsaturated double bond} having a functional group which reacts with {TAIL ~ the aforesaid crosslinking agents}, while the proportion of the aforesaid monomers is at most 50 percent 
Further , after formation of the shells , crosslinking is carried out in the presence of monomers having { HEAD ~ a polymerizable unsaturated double bond } having a functional group which reacts with { TAIL ~ the aforesaid crosslinking agents } , while the proportion of the aforesaid monomers is at most 50 percent
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 HEAD HEAD OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH