Method of making an electrophoretic capillary tube

Details Method of making an electrophoretic capillary tube Method of making an electrophoretic capillary tube

1992-07-14

1994-03-01

Beck, Shrive

Coating processes

Electrical product produced

Carbon coating

4273722, 4273897, 4274072, 427424, 427425, C23C 400, B05D 100

Patent

active

052905870

ABSTRACT:
A method of making a capillary tube for providing increased control of electroosmotic flow in electrophoretic separation. A resistive coating solution is formed so that a tube coating having a high electrical resistivity may be achieved. An electrically conductive material, such as carbon black, is homogeneously mixed with a polymer, such as polyimide, in a solvent. The content by weight of the electrically conductive material is less than 20 percent and is preferably within 7 percent to 8 percent, relative to the content by weight of the polymer. The resistive coating solution is applied to the exterior of the tube until a thickness is reached which achieves a desired resistance across the coated exterior surface. Typically, a multi-layered coating is formed. The coating solution may be applied while rotating the capillary tube or, alternatively, while the capillary tube is drawn past an applicator.

REFERENCES:
patent: 3563916 (1971-02-01), Takashima
patent: 4146454 (1979-03-01), Haber
patent: 4534998 (1985-08-01), Du Pont
patent: 4705616 (1987-11-01), Andresen et al.
patent: 4842701 (1989-06-01), Smith et al.
patent: 4868008 (1989-09-01), Marikar
patent: 4936974 (1990-06-01), Rose et al.
patent: 4940883 (1990-07-01), Karger et al.
patent: 5180475 (1993-01-01), Young

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