Polymer compositions comprising crystalline polymers and a stabilizer composition

A polymer composition comprising:

• (A) at least one semicrystalline polymer, and
• (B) a stabilizer composition comprising:
• (1) at least one primary antioxidant comprising at least one phenolic antioxidant;
• and
• (2) at least one secondary antioxidant comprising at least one phosphite, and
• (3) at least one chain extending agent;
• wherein the initial b* value for said polymer composition is less than 5 and the Δb* value for said polymer composition is less than 3 according to the L*, a* and b* color system of the CIE (International Commission on Illumination) after being heated for at least three hours at 200° C. or after being heated for at least twenty-four hours at 175° C., wherein the at least one primary antioxidant is pentaerythritol tetrakis[3-(3,5-di-t-butyl -4-hydroxyphenyl)propionate,
• wherein the at least one secondary antioxidant is tris(2,4-di-tert-butylphenyl)phosphite,
• wherein the at least one chain extending agent is a copolymer of glycidyl methacrylate and styrene having an average of 5 to 20 pendant epoxy groups per molecule, and
• wherein the polymer composition comprises:
• (a) the at least one chain extending agent in an amount from 0.25 to 2 wt %, based on the total weight of the polymer composition equaling 100 weight %, and the weight ratio of the at least one phenolic antioxidant to the at least one phosphite is from 1:1 to 1:4, or (b) the at least one chain extending agent in an amount from 0.5 to 2 wt %, based on the total weight of the polymer composition equaling 100 weight %, and the weight ratio of the at least one chain extending agent to the at least one phosphite is from 1:1 to 3:1.