Abstract: Disclosed herein are compounds of the structure: wherein R1, R2, R3, R4, R5, and R6 are independently selected alkyl groups, provided that R1 is different from R2. The compounds are useful as stabilizers for thermoplastic resins.

Abstract: Thermoplastic resin composition are provided that comprise a thermoplastic resin or mixture thereof and a stabilizing amount of an aromatic ketone compound, derivative of an aromatic ketone compound, or an adduct of an aromatic ketone compound, optionally containing a stabilizing amount of a stabilizer or mixture of stabilizers selected from the group consisting of the phenolic antioxidants, the 3-arylbenzofuranones, the hindered amine stabilizers, the ultraviolet light absorbers, the organic phosphorus compounds, the alkaline metal salts of fatty acids, the hydrotalcites, the epoxydized soybean oils, the hydroxylamines, the tertiary amine oxides, thermal reaction products of tertiary amine oxides, and the thiosynergists. The compositions have improved stability against thermal degradation.

Abstract: A phosphite and stabilized thermoplastic composition comprising the phosphite where the phosphite has the formula: ##STR1## In the above compound, R.sup.7 and R.sup.8 are preferably alkyl of from 1 to 6 carbon atoms, most preferably an unsubstituted alkyl group. R.sup.9 is preferably alkyl of 1 to 12 carbon atoms. m is from 0 to 5. The dicumyl group includes the OX groups which are the phosphite portion. The OX group is hindered by only one alkylaryl group at the ortho position with the other ortho position being occupied by hydrogen. X has the following formula: ##STR2## wherein R.sub.2 is independently selected from the group consisting of alkyl groups having from 1 to 12 carbon atoms. z.sub.1 and z.sub.2 can be 0 or 1. R.sub.3, R.sub.4 and R.sub.5 are independently selected from the group consisting of hydrogen, halogen, or alkyl of from 1 to 3 carbon atoms.

Abstract: An stabilized thermoplastic composition comprising a stabilizing amount of a phosphite of the formula: ##STR1## R.sub.1 is independently selected from the group consisting of alkyl groups having from 1 to 9 carbon atoms, Y is independently selected from the group consisting of hydrogen, halogen, or alkyl; and the --O--X groups are positioned at the respective ortho- or para- positions with respect to the diphenyl linkage, the remaining ortho- and para- positions with respect to the --O--X linkage being occupied by R.sub.1 whereby the --0--X groups are hindered by the presence of at least one R.sub.1 group; R.sup.

Abstract: Neoalkyl alkylidene-2,2'-bisphenyl phosphite esters are provided. The phosphites exhibit enhanced thermal and hydrolytic stability, and are useful as additives in thermoplastic resin compositions to enhance the thermal oxidative stability thereof.