COMPOSITION FOR MAINTAINING GOOD COLOR WHEN THERMALLY TREATING POLYESTER-POLYAMIDE BLENDS

摘要

A polymer composition and wall of a container made from such composition is set forth comprising a polyamide and polyester and a sufficient amount of an interfacial tension reducing agent such that the polyamide domains stretch disproportionately to the amount of stretch experienced by the polyester both with and without a cobalt salt.

主权项

1. A process for making a wall of a container comprising the steps of:
A) making a crystallizable polyester in the presence of a di-ethylene glycol suppressant in the absence of a cobalt salt wherein the crystallizable polyester comprises acid units and glycol units; at least 85% of the polyester acid units of the crystallizable polyester are derived from terephthalic acid or the dimethyl ester of terephthalic acid; and at least a portion of the acid units, at least a portion of the glycol units, or at least a portion of both the acid units and the glycol units of the crystallizable polyester are an interfacial tension reducing agent consisting of a metal sulfonate; B) forming a compartmentalized pellet having a sheath comprising the crystallizable polyester and a core comprising a polyamide; C) subjecting the compartmentalized pellet to a solid state polymerization; D) injection molding the compartmentalized pellet to form a preform comprising dispersed particles of the polyamide wherein the dispersed particles of the polyamide have an average particle diameter less than 100 nm; and E) forming the wall of the container from the preform.