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SILICONE FUSER ROLLS WITH LOW SILICONE OIL UPTAKE AND GOOD DIMENSIONAL STABILITY

IP.com Disclosure Number: IPCOM000026019D
Original Publication Date: 1989-Oct-31
Included in the Prior Art Database: 2004-Apr-05
Document File: 2 page(s) / 80K

Publishing Venue

Xerox Disclosure Journal

Abstract

Many electrostatographic printing machines have a fusing system to fuse the toner image to the print substrate which includes an internally heated fuser roll made from a dimethyl silicone rubber which forms a nip with a pressure roll through which the print substrate is passed to fuse the toner image. Additionally, a fuser release agent such as a dimethyl silicone oil is applied to the fuser roll to ensure release of the toner from the fuser roll during the fuser operation. The dimethyl silicone oil in contact with the fuser roll permeates the fuser roll leading to swelling of the fuser roll and dimensional instability culminating in fuser roll failure by swelling, debonding and poor copy quality. This is particularly apparent in a dimethyl silicone rubber fuser roll outside the normal paper path where the release agent applied is not removed by the print passing through the fuser nip. One way to minimize this difficulty is to provide a fuser roll with a silicone oil impervious layer placed a few thousandths' of an inch, e.g. 0.001 to 0.008'' below the surface layer of a predominately dimethyl silicone rubber covered fuser roll. The well bonded impervious layer may be of a fluorosilicone polymer or coplymer or a phenol silicone polymer or copolymer. The polymeric barrier layer may be placed properly by a spray process or coextrusion of the barrier layer with the dimethyl silicone layer with the barrier layer preferably being reactive with the dimethyl silicone layers. Both the barrier layer and the dimethyl silicone layers may be silanol end capped to enable reaction with the same crosslinker such as tetraethylorthosilicate and thus the barrier layer would be chemically inco orated into the dimethyl silicone layer immediately adjacent to it there y roviding good adhesion. Since the layer is oil impervious, the swell

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(EROX DISCLOSURE JOURNAL

SILICONE FUSER ROLLS WITH LOW SILICONE OIL UPTAKE AND GOOD DIMENSIONAL STABILITY Clifford 0. Eddy

Proposed Classification

US. C1.355/3FU Int. C1. G03g 15/00

Many electrostatographic printing machines have a fusing system to fuse the toner image to the print substrate which includes an internally heated fuser roll made from a dimethyl silicone rubber which forms a nip with a pressure roll through which the print substrate is passed to fuse the toner image. Additionally, a fuser release agent such as a dimethyl silicone oil is applied to the fuser roll to ensure release of the toner from the fuser roll during the fuser operation. The dimethyl silicone oil in contact with the fuser roll permeates the fuser roll leading to swelling of the fuser roll and dimensional instability culminating in fuser roll failure by swelling, debonding and poor copy quality. This is particularly apparent in a dimethyl silicone rubber fuser roll outside the normal paper path where the release agent applied is not removed by the print passing through the fuser nip. One way to minimize this difficulty is to provide a fuser roll with a silicone oil impervious layer placed a few thousandths' of an inch, e.g. 0.001 to 0.008'' below the surface layer of a predominately dimethyl silicone rubber covered fuser roll. The well bonded impervious layer may be of a fluorosilicone polymer or coplymer or a phenol silicone polymer or copolymer. The polymeric barrier layer may be...