Concentrates for improving polyester compositions and method of making same

摘要

Disclosed is a concentrate useful as an additive in a polyester composition comprising a polyolefin and a polyfunctional carboxylic acid or polyol branching agent. Also disclosed is a method of preparing a polyester composition having increased melt viscosity and melt strength, and improved impact strength which comprises the steps of A) melt compounding a polyolefin and a polyfunctional carboxylic acid or polyol branching agent, B) dry blending the melt compounded mixture formed in A) with a polyester, and C) molding or extruding the dry blended mixture formed into B) to form an article.