Process for the fluorination of a surface layer of formed bodies made of plastics

US4536266A · kind A · utility

Assignee

• Hewing GmbH · DE

Inventors

• Claus Bliefert · Schöppingen, DE
• Hans-Michael Boldhaus · Bad Bentheim, DE
• Manfred Hoffmann · Würzburg, DE

Key dates

• Filing date: Dec 7, 1983
• Grant date: Aug 20, 1985
• Expiry date: Dec 7, 2003

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08J7/126
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

Method for the fluorination of a surface layer of articles molded from plastic, vulcanized rubber or other such macromolecular substances by the exposure of at least a part of the article's surface to a fluorine-yielding liquid in a controllable reaction, the liquid consisting of a solvent or solvent mixture containing dissolved elemental fluorine. Suitable solvents are especially halogen hydrocarbons in accordance with DIN 8962, which are liquid within a temperature range from -30.degree. C. to +10.degree. C., but also water and solvents having perfluoroalkyl groups. The liquid, in which a fluorine concentration between 0.5.times.10.sup.-3 and 1.times.10.sup.-2 mol/l is established by the introduction of fluorine diluted with inert gas, is used to treat the articles for about 20 seconds to 30 minutes; the fluorine can be activated if desired. The liquid can additionally contain sulfur dioxide, oxygen, carbon monoxide, chlorine, bromine, or mixtures thereof.