Liquid Phosphite Compositions Having Different Alkyl Groups
A composition comprising a mixture of at least two different alkylaryl phosphites, wherein some alkyl groups have a different number of carbon atoms than other alkyl groups and wherein the mixture is a liquid at ambient conditions.
1 . A phosphite composition of at least two different alkylaryl phosphites, comprising at least a first alkylaryl phosphite and a second alkylaryl phosphite of structure (XI)
wherein m, n, o, p and q are integers independently selected from 0, 1, 2 and 3 provided that m+n+o+p+q=3
each Ar is an independently selected aromatic moiety of 6 to 18 carbon atoms,
each R 8 is a straight or branched C 1 -C 18 alkyl group having the same number of carbon atoms,
each R 9 is a straight or branched C 1 -C 18 alkyl group having the same number of carbon atoms, provided that R 8 has a different number of carbon atoms than R 9 , said first aralkyl phosphite contains an aromatic moiety substituted by at least one R 8 and said second aralkyl phosphite contains an aromatic moiety substituted by at least one R 9 ,
the molar ratio of R 8 groups to R 9 groups in the phosphites of the composition is from 1:10 to 10:1,
and from 0 to 10% by weight of one or more free phenol having the structure:
based on the combined weight of all phosphites and said free phenol in the composition, wherein the phosphite composition comprises one or more tris(monoalkylaryl) phosphites of structure (XI) wherein m, p and q are 0 and n+o=3, in an amount from 20 to 80 weight percent based on the total weight of all phosphites in the phosphite composition, wherein the composition is a liquid at ambient conditions.
2 . The composition of claim 1 , wherein the composition comprises one or more bis(monaoalkylaryl)dialkylaryl phosphites of structure (XI) wherein m+p+q=1 and n+o=2, in an amount from 15 to 60 weight percent.
3 . The composition of claim 2 , wherein the composition comprises one or more bis(dialkylaryl)alkylaryl phosphites of structure (XI) wherein m+p+q=2 and n+o=1, in an amount from 2 to 20 weight percent.
4 . The composition of claim 3 , wherein the composition comprises one or more tris(dialkylaryl) phosphites of structure (XI) wherein m+p+q=3 and n and o are 0 in an amount from 0.1 to 20 weight percent.
5 . The composition of claim 1 , wherein the composition comprises from 0.01 to 5 weight percent of said phenols based on the total weight of all phosphites and said free phenol in the composition.
6 . The phosphite composition of claim 1 , wherein R 8 and R 9 are selected from propyl, n-butyl, sec-butyl, t-butyl, n-amyl, sec-amyl, neo-amyl and t-amyl.
7 . The composition of claim 1 , comprising a first alkylaryl phosphite having the structure:
and a second alkylaryl phosphite having the structure:
wherein a, b, c, and d are independently integers selected from 0, 1, 2, and 3, provided that a+b=3 and c+d=3, wherein each Ar is phenyl, and wherein each R 8 is an alkyl group having the same number of carbon atoms, and each R 9 is an alkyl group having the same number of carbon atoms, provided that R 9 has a different number of carbon atoms than R 8 .
8 . The composition of claim 7 , wherein R 8 is propyl or t-butyl.
9 . The composition of claim 7 , wherein R 9 is t-amyl.
10 . The composition of claim 7 , wherein R 8 is t-butyl and R 8 is t-amyl.
11 . A phosphite composition of claim 1 , wherein at least one of the first or second phosphites has the structure.
wherein e, f, g and h are independently selected from 0, 1 and 2, provided that e+f+g+h=3, e+f=1 or 2, and g+h=1 or 2, Ar is phenyl, R 8 and R 9 are independently selected from straight or branched C 1 -C 18 alkyl groups, provided that R 8 has a different number of carbon atoms than R 9 .
12 . The composition of claim 11 , wherein R 8 is propyl or t-butyl.
13 . The composition of claim 11 , wherein R 9 is t-amyl.
14 . The composition of claim 11 , wherein R 8 is t-butyl and R 9 is t-amyl.
15 . The phosphite composition of claim 1 , wherein least one of the first or second alkylaryl phosphites is of the structure (XI) wherein m is an integer selected from 1, 2 and 3; n, o, p and q are integers independently selected from 0, 1 and 2, provided that m+n+o+p+q=3, wherein each Ar is phenyl, and wherein each R 8 is an alkyl group having the same number of carbon atoms and each R 9 is an alkyl group having the same number of carbon atoms, provided that R 8 has a different number of carbon atoms than R 9 .
16 . The composition of claim 15 , wherein R 8 is propyl or t-butyl.
17 . The composition of claim 15 , wherein R 9 is t-amyl.
18 . The composition of claim 15 , wherein R 8 is t-butyl and R 9 is t-amyl.
19 . A stabilized polymer composition comprising a polymer and the phosphite composition of claim 1 .