Alkylated 2,2'-biphenylene phosphites and stabilized compositions

Claim 1

A composition of matter comprising an organic material subject to oxidative, thermal and actinic degradation stabilized with from about 0.01 to about 5% by weight, of the total composition, of a 1,1'-biphenyl-2,2'-diyl phosphite of the formula ##STR9## wherein R is an alkyl group of 1 to 18 carbon atoms, R 1 is hydrogen or alkyl group of 1 to 18 carbon atoms, and R 2 is an alkyl group of 1 to 20 carbon atoms, phenyl, phenyl substituted by 1 to 3 alkyl groups each having 1 to 8 carbon atoms, or by two alkyl groups each having 1 to 8 carbon atoms and by --COOR 4 where R 4 is alkyl of 1 to 18 carbon atoms, R 3 is an n-valent radical selected from the group consisting of a straight- or branched-chain alkylene of 2 to 12 carbon atoms, a straight- or branched chain alkane-triyl, -tetrayl, -pentayl or -hexayl of 3 to 6 carbon atoms, alkenylene of 4 to 6 carbon atoms, cycloalkylene of 6 to 12 carbon atoms, 1,4-cyclohexanedimethylene, arylene or arenetriyl of 6 to 10 carbon atoms, p-xylylene, phenylene-E-phenylene where E is a direct bond, --O--, --S--, --NR 5 --, where R 5 is alkyl of 1 to 18 carbon atoms; a straight- or branched chain alkylene or alkylidene of 1 to 12 carbon atoms or cycloalkylidene of 5 to 6 carbon atoms, said arylene or said phenylene-E-phenylene substituted by 1 to 4 alkyl groups each having 1 to 8 carbon atoms, --(CH 2 ) x X(CH 2 ) x -- where x is 2 to 6, dipentaerythrityl, and ##STR10## where Y is hydrogen, methyl or ethyl and z is 1 to 10, X is oxygen or sulfur, and n is 2 to 6.