Hydrophilizing plasma coating
AssigneeBioenergy Capital AG
InventorsMartin Görne, Thomas Kordick
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Abstract
The invention relates to a method for hydrophilizing surfaces of polymer workpieces. The method has a step (a) of pretreating the workpiece surfaces in a high-frequency gas plasma which is produced on the basis of an inert gas in order to clean and activate the workpiece surfaces; a step (b) of precoating the pretreated workpiece surfaces with polyacrylic acid using a high-frequency gas plasma made of a gas mixture, said gas mixture being composed of an inert gas and a first gas made of biocompatible, polymerizable carboxy group-containing monomers; and a step (c) of subsequently coating the precoated workpiece surfaces using a second gas substantially containing acrylic acid monomers.
Claims19
A process of hydrophilizing surfaces of a porous biocompatible polymeric matrix, the process comprising steps of:
- (a) pre-treating the matrix surface for cleaning and activating the matrix surfaces, and of
- (b) pre-coating the pre-treated matrix surfaces with poly(acrylic acid), and further a step of
- (c) follow-up-coating the pre-coated matrix surfaces with poly(acrylic acid), wherein,
- the pre-treating in step (a) occurs in a high-frequency gas plasma formed on the basis of an inert gas and acrylic acid monomers, the partial pressure of the latter being maximally twice that of the inert gas;
- and
- the pre-coating with poly(acrylic acid) according to step (c) occurs in the recipient using a gas composition different from the composition of step (b), namely consisting of acrylic acid monomers.
Dependencies are inferred from the claim text.