Process for the after-treatment of thermoplastic fluoropolymers

US5861464A · kind A · utility

Assignee

• Dyneon GmbH · DE

Inventors

• Gerhard Goldmann · Neuötting, DE
• Klaus Hintzer · Woodbury, US
• Gernot Lohr · Altötting, DE
• Ludwig Mayer · San Jose, US

Key dates

• Filing date: Dec 20, 1996
• Grant date: Jan 19, 1999
• Expiry date: Dec 20, 2016

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F2800/20
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Labile end groups in fluorinated thermoplastics, in particular carboxyl and acid fluoride groups, are converted into carboxamide groups when the polymer is treated with an aqueous, ammonia-containing solution. The after-treated products have a pale color, do not cause corrosion during processing and can easily be taken from the molds in transfer molding.