Tube having regions of different surface chemistry and method th

Details Tube having regions of different surface chemistry and method th Tube having regions of different surface chemistry and method th

1992-10-02

1994-06-07

Warden, Robert J.

Coating processes

Direct application of electrical, magnetic, wave, or...

Polymerization of coating utilizing direct application of...

427488, 427562, 427569, 427577, B05D 104, B05D 500

Patent

active

053188063

ABSTRACT:
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.

REFERENCES:
patent: 4673586 (1987-06-01), White
patent: 4967763 (1990-11-01), Nugent et al.
patent: 5227202 (1993-07-01), Thiebaud et al.
Pitt, W. G. "Fabrication of a continuous wettability gradient . . . " J. Colloid Interface Science 133(1), 223-7, 1989.
Golander et al., Biomaterials 11,32 (1990).
Elwing et al., Advances in Colloid and Interface Science, 32,317 (1990).

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