Patent ID: 7872157

Claim:
A phosphonite compound having the structure of formula (I): wherein R is an alkyl, cycloalky or aryl group which is substituted or unsubstituted and which contains 1 to 30 carbon atoms; Ar 1 and Ar 2 are each independently selected from aryl groups which are substituted or unsubstituted and which contain 4 to 30 carbon atoms; R1 to R4 are each independently selected from H and alkyl, cycloalkyl, and aryl groups which are substituted or unsubstituted, and which contain 1 to 40 carbon atoms; and R 5 and R 6 are each independently selected from substituted or unsubstituted cycloalkyl, aryl-substituted alkyl, cycloalkyl-substituted alkyl and substituted or unsubstituted aryl groups, wherein R 5 and R 6 each contain up to 40 carbon atoms; and X is (i) a chemical bond directly between ring carbon atoms of each aromatic group, (ii) a heteroatom, or (iii) a group having the formula wherein R15 and R16 are each independently selected from hydrogen and alkyl or aryl having up to 10 carbon atoms.