Browse Prior Art Database

IMPROVED HYDROCARBON RELEASE AGENTS FOR FUSERS IN ELECTROSTATIC COPIERS

IP.com Disclosure Number: IPCOM000023604D
Original Publication Date: 1978-Jun-30
Included in the Prior Art Database: 2004-Mar-31
Document File: 4 page(s) / 750K

Publishing Venue

Xerox Disclosure Journal

Abstract

Toners 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 of the type which oxidizes and is capable of reacting with the material of the fuser member base. 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 of a high surface energy material, such as 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. Polyethylene is one of the preferred polymer release materials.

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Page 1 of 4

XEROX DISCLOSURE JOURNAL

IMPROVED HYDROCARBON RELEASE Proposed Classification
AGENTS FOR FUSERS IN ELECTRO- U.S. Cl. 148/6
STATIC COPIERS tnt. Cl. C23f 7/00
Thomas R. Hoffend
Donald A. Seanor

Toners 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 of the type
which oxidizes and is capable of reacting with the material of
the fuser member base. 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 of a high surface energy
material, such as 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. Polyethylene is one of the preferred
polymer release materials.

The present, disclosure is directed to improved hydrocarbon
release agents comprising a blend of hydrocarbon-based polymer
materials. In accordance with the present disclosure, a
branched, lower density hydrocarbon polymer is blended with
higher density, non-branched or lower branched hydrocarbon
polymer, and the polymer composition resulting therefrom
demonstrates greatly improved thermal stability over the
thermal stability of the branched, lower density hydrocarbon
polymer alone without compromising the good release properties
normally characterized by the branched, lower density
hydrocarbon polymers. Thus, the polymer blends of this
disclosure overcome the long-term disadvantage of thermal in-
stability which is evidenced by gelation of the polymer.

A lower density hydrocarbon polymer is generally considered
one which is a partially crystalline solid having a density
less than about 0.95. Higher density hydrocarbon polymers are
more completely crystalline, solids having a density greater
than about 0.95. The higher density hydrocarbon polymers are
not as soluble in solvents at temperatures about 100°C. For
example, low density polyethylene is a partially (50-60
percent) crystalline solid with a density in the range of
0.91-0.94. Low density polyethylene may contain branched
chains due either to intermolecular chain transfer or short-
chain branching by intramolecular chain transfer. Branched
and non-branched hydrocarbon polymers are terms well known in
the art.

Volume 3 Number 3 May/June 1978 149

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IMPROVED HYDROCARBON RELEASE AGENTS FOR FUSERS
IN ELECTROSTATIC COPIERS (Cont~d)

Exemplary of the release agents of this disclosure is a blend
of a branched, lower~densitypolyethylene blended into a non~
branched or lower~branched, higher density polyethylene using
about 0.1 to about 50 weight percent of the lower density
polyethylene. This results in a reduction of the branching of
the final blend and thereby controls the thermal oxidative
reactivity of the release material.

Hydrocarbon polymers whi...