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SEALING ANODIZED COATINGS WITH POLYESTERS

IP.com Disclosure Number: IPCOM000027286D
Original Publication Date: 1996-Feb-29
Included in the Prior Art Database: 2004-Apr-07
Document File: 2 page(s) / 80K

Publishing Venue

Xerox Disclosure Journal

Abstract

Proposed is an improved coating for hybrid scavengeless development donor rolls which reduces humidity driven electrical conductivity variations on anodized aluminum rolls. The improvement is achieved by treating the surface with a polyester solution.

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XEROX DISCLOSURE JOURNAL

SEALING ANODIZED COATINGS Proposed Classification WITH POLYESTERS U.S. C1.3551259 William G. Herbert
Louis V. Isgantis
Donald C. VonHoene
William W. Limburg
Eugene A. Swain

Int. C1.303g 15/06

Proposed is an improved coating for hybrid scavengeless development donor rolls which reduces humidity driven electrical conductivity variations on anodized aluminum rolls. The improvement is achieved by treating the surface with a polyester solution.

Donor rolls currently manufactured for hybrid scavengeless development systems are made from aluminum. Subsequently rolls are anodized and sealed. Under most conditions, this configuration provides an acceptable roll. The rolls can be machined to required tolerances and provided with an overcoating of A1203 (anodize) via low temperature &So4 anodizing. Finally, the anodize is stabilized by a sealing process employing nickel acetone or hot water. The resulting surface has a resistivity on the order of 107 ohms which bleeds off any charge build-up. Its dielectric strength prevents arching between charged wires in close proximity to the donor roll and the roll core.

However, a hot water sealed anodized roll becomes non-conductive in a low humidity environment. The build up of unwanted charge causes the donor roll to become less useful. A nickel acetate sealed roll also becomes more conductive when used in a high humidity environment. When its conductivity (loss of dielectric property) is too high, arching...