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AssigneeHewing GmbH
InventorsClaus Bliefert, Hans-Michael Boldhaus, Manfred Hoffmann
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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.
Method for fluorinating surface layers of articles molded from macromolecular polymeric materials capable of being fluorinated which comprises exposure of at least a portion of said article to a fluorine-containing liquid consisting essentially of elemental fluorine dissolved in a solvent or solvent mixture which are essentially inert with respect to fluorine and said article and reacting said elemental fluorine with said surface layers.
Dependencies are inferred from the claim text.