Patent ID: 8304477

Claim:
A stabilizer mixture comprising oxyalkylene bridged bis- and tris-phosphite esters of formulae I and II where R is hydrogen or methyl, n and n′ are independently an integer from 1 to 45 and R 1 , R 2 and R 3 are each independently hydrogen, straight or branched chain alkyl of 1 to 12 carbon atoms, phenylalkyl of 7 to 9 carbon atoms, phenylalkyl of 7 to 9 carbon atoms substituted on the phenyl ring by one to three straight or branched chain alkyl of 1 to 12 carbon atoms or R 1 , R 2 and R 3 are each independently —(CH 2 ) k —COOR 4 where k is 0, 1 or 2 and R 4 is hydrogen or straight or branched chain alkyl of 1 to 20 carbon atoms.