Polymer compositions containing organic phosphite stabilizers

Polymer compositions comprising the phosphites of the formula:

• ##STR5## where R, equal or different, are H;
• linear or branched C.sub.1 -C.sub.30 alkyl radicals;
• C.sub.5 -C.sub.6 alicyclic radicals;
• C.sub.7 -C.sub.12 aralkyl radicals;
• 2-furfuryl or phenyl radicals, optionally substituted by one or more electron donor groups selected from alkyl and alcoxyl groups, and present in the para or meta positions, or both;
• 2-cyclohexylethyl or p-phenylphenyl;
• R', equal or different, are C.sub.1 -C.sub.30 alkyl radicals, or C.sub.5 -C.sub.30 simple or condensed alicyclic radicals;
• aryl radicals, simple, double, or condensed, optionally substituted with C.sub.1 -C.sub.9 alkyl groups, or with aryl groups joined by a heteroatom, or by a C(R.sub.2 R.sub.3) group, where R.sub.2 and R.sub.3, equal or different, are H, or C.sub.1 -C.sub.5 alkyl, or C.sub.6 -C.sub.10 aryl radicals;
• R.sub.1 radicals, equal or different, are H or C.sub.1 -C.sub.4 alkyl radicals;
• with the proviso that when R is H, R.sub.1 are C.sub.1 -C.sub.4 alkyls.