the process of this invention can be utilized to stabilize tin - coupled rubbery polymers . this process involves adding a chelating diamine or a metal salt of a cyclic alcohol to the rubbery polymer after the tin coupling has been carried out . this invention more specifically discloses a process for improving the stability of a tin - coupled rubbery polymer which comprises adding a metal salt of a cyclic alcohol to the tin - coupled rubbery polymer subsequent to the time at which the tin - coupled rubbery polymer is coupled . the use of metal salts of cyclic alcohols does not lead to recycle stream contamination because they do not co - distill with hexane or form compounds during steam - stripping which co - distill with hexane . in other words , the boiling points of these metal salts of cyclic alcohols are very high , so they do not co - distill with hexane and contaminate recycle streams . additionally , metal salts of cyclic alcohols are considered to be environmentally safe . in fact , sodium mentholate is used as a food additive .