Patent ID: 8623945

Claim:
A process for stabilizing polymers against hydrolysis, the process comprising adding an effective amount of an oligomeric carbodiimide, comprising a heterocyclic end group, and a chain extender to a polymer, wherein the oligomeric carbodiimide is a compound represented by formula (I): wherein: A 1 , A 2 are each independently, identically or differently, hydrocarbon groups having 2 to 20 carbon atoms; B 1 , B 2 are each independently, identically or differently: R 3 —(O—CH 2 —CHR 4 ) m —O—*, R 1 , R 2 are each independently, identically or differently: n is an integer from 2 to 100; and A 1 , A 2 , B 1 and B 2 are each optionally substituted at any position by C 1 ,-C 20 -alkyl, C 2 -C 20 -alkenyl, C 2 -C 20 -alkynyl, C 1 ,-C 20 -alkoxy, carbonyl oxygen (═O) or halogen, with the proviso that at least one B 1 or B 2 substituent is a heterocyclic end group.