Abstract: Polymer compositions for making a stabilized polymeric articles that are resistant to discoloration upon exposure to UV-C light having: (i) an organic polymeric material; and (ii) a hindered phenol, organic phosphite, or a combination thereof, with the provisos that: (a) the OH group on the aromatic ring of the hindered phenol is flanked by two tertiary hydrocarbyl groups, and (b) the organic phosphite does not have any-OAr group linked directly to the P atom of the phosphite, wherein Ar represents an unsubstituted or substituted aryl group, are provided herein. Reduced discoloration is associated with the use of specific hindered phenols and the organic phosphites compared to other hindered phenols and organic phosphites, even in the absence of other polymer additives including UV absorbers, hindered amine light stabilizers (HALS), metal oxides and/or barium salts.

Abstract: Polymer compositions for making stabilized polymeric articles that are resistant to at least one deleterious effect of discoloration, cracking, or crazing upon exposure to UV-C (190-280 nm) light are provided herein, wherein the polymer compositions include: (i) an organic polymeric material; and (ii) a stabilizer composition comprising: an antioxidant selected from the group consisting of hindered phenols, phosphites and phosphonites, and mixtures thereof; and a light stabilizer selected from the group consisting of hindered amine light stabilizers (HALS), UV absorbers (UVA), hindered benzoates, and mixtures thereof, even where barium compounds (such as barium salts) are absent from the stabilizer composition, and with the proviso that the HALS is not bis(2,2,6,6,-tetramethyl-4-piperidyl) sebacate (TINUVIN™ 770) alone.

Abstract: Polymer compositions for making a stabilized polymeric articles that are resistant to discoloration upon exposure to UV-C light having: (i) an organic polymeric material; and (ii) a hindered phenol, organic phosphite, or a combination thereof, with the provisos that: (a) the OH group on the aromatic ring of the hindered phenol is flanked by two tertiary hydrocarbyl groups, and (b) the organic phosphite does not have any —OAr group linked directly to the P atom of the phosphite, wherein Ar represents an unsubstituted or substituted aryl group, are provided herein. Reduced discoloration is associated with the use of specific hindered phenols and the organic phosphites compared to other hindered phenols and organic phosphites, even in the absence of other polymer additives including UV absorbers, hindered amine light stabilizers (HALS), metal oxides and/or barium salts.