For example, shells are formed employing the aforesaid vinyl monomers having {TAIL ~ an isocyanate group} or an epoxy group, or vinyl monomers having a carboxyl group which react with an oxazoline group, and hydrazide crosslinking agents having {HEAD ~ an active hydrogen atom} such as vinyl monomers having a group which undergo crosslinking with aforesaid adipic acid hydrazide  
For example , shells are formed employing the aforesaid vinyl monomers having { TAIL ~ an isocyanate group } or an epoxy group , or vinyl monomers having a carboxyl group which react with an oxazoline group , and hydrazide crosslinking agents having { HEAD ~ an active hydrogen atom } such as vinyl monomers having a group which undergo crosslinking with aforesaid adipic acid hydrazide
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL 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 HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH