Basf Aktiengesellschaft

Erich Pellkofer

Thomas Heitz

Herbert Fisch

Peter Braune

Volker Lohrbaecher

Georg Schneider

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 &lE;5&deg; 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).

Use of high-molecular polyester moulding materials

Polyamide molding materials having high heat distortion resistance for the production of blow-molded articles contain essentially two highly viscous polyamides which are homogeneously miscible with one another and have melting points which differ by 10.degree.-50.degree. C., the amount of the polyamide having the low melting point being from 5 to 40% by weight and the amount of that having the high melting point being from 60 to 95% by weight.

Growing community of inventors

Mutterstadt, Germany

Erich Pellkofer