Browse Prior Art Database

POLYMER BLENDS AS RELEASE AGENTS FOR BARE METAL FUSERS IN ELECTROSTATIC COPIERS

IP.com Disclosure Number: IPCOM000023607D
Original Publication Date: 1978-Jun-30
Included in the Prior Art Database: 2004-Mar-31
Document File: 4 page(s) / 775K

Publishing Venue

Xerox Disclosure Journal

Abstract

Toner particles can be fused to a substrate by contacting the toner particles upon the substrate with a heated fuser member bearing a coating of a polymer release material such as low molecular weight linear polymers of ethylene. For example, in U.S. Patent 3,937,637 there is described a fuser roll structure for fusing toner images to a substrate wherein the toner images contact a rigid, thermally conductive core having a high surface energy, such as glass or metal, having a coating of a polymer release material on the core, the polymer release material being the type which oxidizes and is capable of reacting with the core surface material. Branched poly-ethylene is one of the preferred polymer release materials. However, these branched polyethylene release materials are characterized by disadvantages in the fuser system due to their poor thermal oxidative stability. Low molecular weight, linear, non-branched polyethylenes have greatly improved ther-mal oxidative stability when used as fuser release agents. However, these latter polyethylenes give lower hot offset tem- •peratures and, therefore, less fuser temperature control latitude than higher molecular weight, branched polyethylenes.

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Page 1 of 4

XEROX DISCLOSURE JOURNAL

POLYMER BLENDS AS RELEASE AGENTS Proposed Classification

FOR BARE METAL FUSERS IN ELECTRO- U.S. Cl. 148/6
STATIC COPIERS Int. Cl. C23f 7/00
Thomas R. Hof fend
Donald A. Seanor

Toner particles can be fused to a substrate by contacting the
toner particles upon the substrate with a heated fuser member
bearing a coating of a polymer release material such as low
molecular weight linear polymers of ethylene. For example, in
U.S. Patent 3,937,637 there is described a fuser roll
structure for fusing toner images to a substrate wherein the
toner images contact a rigid, thermally conductive core having
a high surface energy, such as glass or metal, having a
coating of a polymer release material on the core, the polymer
release material being the type which oxidizes and is capable
of reacting with the core surface material. Branched poly-
ethylene is one of the preferred polymer release materials.
However, these branched polyethylene release materials are
characterized by disadvantages in the fuser system due to
their poor thermal oxidative stability. Low molecular weight,
linear, non-branched polyethylenes have greatly improved ther-
mal oxidative stability when used as fuser release agents.
However, these latter polyethylenes give lower hot offset tem-
*peratures and, therefore, less fuser temperature control
latitude than higher molecular weight, branched polyethylenes.

Hot offset or offsetting is the transfer of toner from one
substrate to another substrate and more specifically, from the
substrate to which it is to be fused, for example a copy sheet,
to the fuser roll. When toner contacts the heated fuser
member, the toner liguifies or becomes molten; and in this
state, it has a tendency to split, part of the toner remaining
on the substrate to which it is to be fused and part of the
toner transferring to the heated fuser member. This is known
as hot offset. The higher the temperature of the fuser member
before offsetting or hot offset occurs the better the release
properties. This problem may be overcome by incorporating an
amount up to 20 percent by weight of a polymer release
material, such as linear polyethylene, having carboxylic acid
end groups thereon and designated as acid polymer herein into

Volume 3 Number 3 May/June 1978 155

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Page 2 of 4

POLYMER BLENDS AS RELEASE AGENTS FOR BARE METAL
FUSERS IN ELECTROSTATIC COPIERS (Cont~d)

the linear, low molecular weight polymer release material~
The low molecular weight polymer release material having the
polymer material with carboxylic acid end groups thereon
improves the release performance but introduces an acid
content into the polymer blend, The acid reacts with the
metal surfaces of the release agent dispensing members, such
as the release agent sump, and the metal parts become etched,
particularly during fuser stand~by. This acid reaction with
the metal parts of the dispensing member compromises copy
quality by appearing as a visual defect in sol...