Patent ID: 7700171

Claim:
A tube-coated flexible belt for a heat-fixing apparatus, the belt comprising a base layer, a silicone-rubber elastic layer, and an adhesive layer and a fluorine resin tube, the fluorine resin tube being adhered to the silicone-rubber elastic layer with the adhesive layer, wherein said adhesive layer is composed of a cured product of an organopolysiloxane adhesive composition comprising: (A) polydimethylsiloxane having alkenyl groups at both terminals thereof and having a viscosity from 900 Pa·s to 3000 Pa·s at 25° C.; (A′) an organopolysiloxane represented by the general formula (I): (R 3 SiO 1/2 ) x (SiO 4/2 ) 1.0 (I) wherein R is a univalent hydrocarbon group, and X is a number between 0.65 and 1.9, and wherein said organopolysiloxane has at least two alkenyl groups in a molecule; (B) an organopolysiloxane having at least two silicon-atom-bonding hydrogen atoms in a molecule; (C) a platinum-based compound; and (D) an organic silicon compound having a silicon-atom-bonding alkoxy group and at least one selected from the group consisting of an end unsaturated group, an end epoxy group, and a silicon-atom-bonding hydrogen atom in a molecule, wherein the adhesive layer is from 1 μm to 10 μm in thickness and the adhesive layer is formed by curing the organopolysiloxane adhesive composition having a viscosity from 0.2 Pa·s to 5.0 Pa·s at 25° C., and wherein the belt has sufficient flexibility to prevent delamination thereof in the heat fixing apparatus after cycling for at least 100,000 sheets.