Appeal No. 94-2441 Application 07/821,314 The subject matter on appeal is directed to a liquid developer for use in electrophotography comprising a toner which is dispersed into an aliphatic hydrocarbon carrier liquid. The toner is comprised of a colorant and a polyolefin resin. Importantly, the polyolefin resin is defined as having an acid value of from 5 to 50 and a melt viscosity at 200EC of from 100 to 15,000 cps. When the polyolefin resin component of the toner has an acid value of less than 5, allegedly the toner does not exhibit sufficient adhesiveness. When the toner component has an acid value of greater than 50, it is said that the toner particles tend to coagulate and thereby affect the storage stability (the “preservability”) of the composition. With respect to the melt viscosity parameter of the claimed polyolefin resin, appellants indicate (Specification, pages 5 and 6) that when a polyolefin having a melt viscosity of below 100 cps is used, the toner layer permeates through a transfer sheet to the reverse side upon application of heat, thus resulting in images which are fixed to both sides of the transfer sheet. Further, it is stated that when a polyolefin having a melt viscosity of more than 15,000 cps is employed, the toner cannot be easily melted upon application of heat. Therefore, it is difficult to fix the toner image to a transfer sheet at a low temperature. See the 3Page: Previous 1 2 3 4 5 6 7 8 9 NextLast modified: November 3, 2007