DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The phosphorus additive of formula A can be a phosphonate, phosphonite, phosphate, phosphinate, phosphinite, phosphite or the corresponding amide or imide derivatives.
R.
sup.
1, R.
sup.
2, R.
sup.
3, R.
sup.
4 and R.
sup.
5 may be straight chain or branched chain alkyl groups.
Examples of such groups include methyl, ethyl, propyl, isopropyl, tert-butyl, pentyl, dodecyl, decyl, hexadecyl, nonyl, octadecyl, 2-methyl dodecyl, 2-ethyl hexyl, 2-methyl pentyl, 2-ethyl octyl, 2-methyl octyl and 2-methyl hexyl.
Illustrative amino groups for R.
sup.
1 and R.
sup.
2 include butylamine, nonylamine, hexadecylamine and decylamine and the amine shown in formula B above.
If at least one of X, Y or Z is not an oxygen heteroatom, M can be a metal ion such as molybdenum, tin, antimony, lead, bismuth, nickel, iron, zinc, silver, cadmium or lead or the carbides, oxides, sulfides or oxysulfides thereof.
M can also be a non-metallic moiety such as hydrogen, a sulfur-containing group, alkyl, alkylaryl, arylalkyl, hydroxyalkyl, an oxy-containing group, amido or an amine.
In general, any alkyl group should be suitable, but alkyls having from 2 to 20, preferably 3 to 16, carbon atoms are preferred.
The alkyls could be straight chain or branched.
Illustrative alkyl groups include methyl, ethyl, propyl, isopropyl, tert-butyl, pentyl, 2-ethylhexyl, dodecyl, decyl, hexadecyl and octadecyl.
In general, any aryl groups should be suitable.
Illustrative aryl groups include phenyl, benzylidene, benzoyl and naphthyl.
In general, any amido-containing groups should be suitable.
Illustrative amido groups include butynoamido, decynoamido, pentylamido and hexamido.
In general, any amino groups should be suitable.
Illustrative amino groups include butylamine, nonylamine, hexadecylamine and decylamine and the amine shown in formula B above.
In general, any alkylaryl or arylalkyl groups should be suitable.
Illustrative alkylaryl or arylalkyls include benzyl, phenylethyl, phenylpropyl, and alkyl-substituted phenyl alcohol
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