Use of hydrogenated polybenzyls as a mould-release agent for aromatic polyesters

US4405554A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Dieter Freitag · Krefeld, DE
• Klaus Reinking · Wermelskirchen, DE
• Peter Tacke · Krefeld, DE

Key dates

• Filing date: Sep 14, 1981
• Grant date: Sep 20, 1983
• Expiry date: Sep 14, 2001

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08L87/00
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Small quantities of hydrogenated polybenzyls act as a perfect mould release agent for aromatic polyesters based on diphenols and iso- and/or terephthalic acids and do not appreciably impair the elastic strength characteristics, the dimensional stability under heat and the transparency.