Use of high-molecular polyester moulding materials

US6262185A · kind A · utility

Assignee

• BASF SE

Inventors

• Thomas Heitz · Ludwigshafen am Rhein, DE
• Peter Braune · Speicher, DE
• Herbert Fisch · Monsheim, DE
• Erich Pellkofer · Mutterstadt, DE
• Georg Schneider · Coburg, DE

Key dates

• Filing date: Apr 10, 2000
• Grant date: Jul 17, 2001
• Expiry date: Apr 10, 2020

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/31786
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The invention relates to the use of thermoplastic polyester molding compounds, containing A) 80 to 100 wt. % of a polyalkylene arylate, especially polybutyleneterephthalate, with a half-width of crystallization heat releases of .ltoreq.5.degree. C. and B) 0 to 20 wt. % of other additives, the weight percentages of constituents A) and B) adding up to 100%, for producing molded bodies by blow-molding, profile extrusion and/or pipe extrusion. A preferred use for the inventive molding compounds is the production of light guide sheathing. The invention also relates to a 3-stage method for producing the polyesters as follows: a) esterification or re-esterification of an aromatic dicarboxylic acid or its derivative and a glycol; b) precondensation; and c) polycondensation to a viscosity number of at least 158 ml/g. The reaction is carried out in at least 2 temperature zones in stages a) and b).