VITON/RTV SILICONE FUSER RELEASE OVERCOATING
Original Publication Date: 1986-Oct-31
Included in the Prior Art Database: 2004-Apr-04
Xerox Disclosure Journal
During the fusing operation in an electrostatographic reproducing device heat is applied to the toner particles which are supported on the support and both the toner image and the support are passed through a nip formed between the roll pair. Toner particles are elevated to a temperature at which the constituents of the toner material coalesce and become tacky and to some extent flow into the fibers or pores of the support member Thereafter as the toner material COOIS solidification of the toner material causes it to be firmly bonded to the support. It is important in the fusing process that no offset of the toner particles from the support to the fuser member takes place since such would lead to background on subsequent copies As a result it is desired to have an excellent releasing surface on the fuser member An improved fuser member with an improved releasing surface comprises a fuser roll having a sprayed coated outer fusing layer from a mixture Viton, trademark of E. I. DuPont deNemours & Co , a fluoroelastomer based on the copolymer of vinylidene fluoride and hexafluoropropylene and an RTV silicone rubber This fuser surface may be used with the traditional dimethylsilicone release fluids and provides an excellent releasing surface. Alternatively, it may be used without a release agent It is believed that the Viton provides the desired mechanical strength for the fuser roll while the silicone provides the desired release properties. By way of example the following composition may be compounded Part A contains 100 parts by weight of RTV Silicone (Emerson Curnmings 4952) and 0.25 parts by weight of a tin soap catalyst Part B contains 50 parts by weight Viton E60C 50 parts by weight methylethylketone and 150 parts by welght methylisobutylketone Parts A and Parts B are combined and vigorously dispersed and then sprayed with a Binks sprayer to an aluminum substrate to a thickness of 5 mills which provide the releasing surface.