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