B - Operations – Transporting – 01 – J
Patent
B - Operations, Transporting
01
J
B01J 19/08 (2006.01) A61L 33/00 (2006.01) B05D 7/24 (2006.01) B29C 59/14 (2006.01) C03C 23/00 (2006.01)
Patent
CA 2107037
In a method to modify the chemistry of a portion of the surface of an article, the surface is placed adjacent an electrode in a plasma chamber, the distance to the wall of the chamber being at least five times the size of the electrode. A plasma of very high power density is generated in a discharge volume surrounding the electrode so that the surface area closest to the electrode receives a very intense plasma which, diminishes with increasing distance from the discharge volume thus forming a chemical gradient on the article surface. The preferred article is a tube having one closed end, and the gradient may be formed from either the closed end or the open end. The gradient may be of decreasing glass-like character or decreasing plastic-like character.
Montgomery David B.
Vogler Erwin A.
Becton Dickinson And Company
Gowling Lafleur Henderson Llp
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