Polyester resin composition and a process for manufacturing the same

摘要

Co-polyester resin compositions and processes for manufacturing resin compositions are provided, said resin compositions being suitable for extrusion blow molding for the manufacture of containers with good color, clarity for both food, non-food applications and other applications such as profile extrusions and manufacture of blown films which require high melt strength polyester.

主权项

1. A process for preparing an extrusion-blow-moldable co-polyester resin composition; the process comprising:
(a) charging in a reactor
at least one pair of polyester-forming materials selected from the group of pairs consisting of a diol-dicarboxylic acid pair, a diol-dicarboxylic ester pair, and a diol-recycled PET pair,a co-monomer, andat least one additive selected from the group consisting of an impact modifier, an antioxidant, a catalyst, an acetaldehyde inhibitor, and a color toner,to obtain a reaction mixture;
(b) subjecting the reaction mixture to an esterification, an ester-interchange reaction, or glycolysation, to yield a pre-polymer; (c) charging a chain extender, in a proportion of about 0.05 wt. % to about 2.0 wt. % with respect to a total mass of the reaction mixture, in the reaction mixture during (b) in at least one portion or continuously at a controlled dosing rate when an intrinsic viscosity of the reaction mixture is <0.20; (d) subjecting the pre-polymer to polycondensation at a temperature in the range of about 270° C. to about 305° C. under a pressure of less than 10 mb, to obtain amorphous chips such that an intrinsic viscosity of the amorphous chips ranges from 0.40 to 0.80; (e) crystallizing the amorphous chips at a temperature ranging from about 110° C.-170° C., to obtain crystallized chips with a crystallinity of more than 30%; and (f) processing the crystallized chips in a solid state polymerizer at a temperature in the range of about 190° C. to about 225° C. until an intrinsic viscosity of processed chips ranging from about 0.70 to about 2.0 is achieved, to obtain an EBM grade co-polyester resin composition.