Patent ID: 7547406

Claim:
A method of making molded articles of high-condensation polyester having an acetaldehyde content in a preform of high-condensation polyester of a maximum of 8 ppm, the method comprising the steps of: (a) producing a melt of a high-condensation polyester in a polycondensation reactor system and outputting the high-condensation polyester melt from a final stage of a high-viscosity self-cleaning or double-drive reactor; (b) flowing the outputted high-condensation polyester melt without any solidification or degasification from said final reactor stage to a molding unit; (c) adding an acetaldehyde-reducing substance or a mixture of acetaldehyde-reducing substances one or at most two times to the high-condensation polyester melt flow downstream of the final reactor stage and upstream of the molding unit; and (d) thereafter introducing the high-condensation polyester melt flow with the acetaldehyde-reducing substance into the molding unit and shaping said molded articles from said high-condensation polyester melt in said molding unit.