Rotatable fixing member, manufacturing method thereof and fixing device

Abstract

A rotatable fixing member includes an elastic layer, a primer layer provided on the elastic layer, and a parting layer provided on the primer layer. The primer layer contains a crystalline fluorocarbon polymer having a functional group and has a thickness of 850 nm or less. The parting layer is a coating layer of a crystalline fluorocarbon polymer.

1 . A rotatable fixing member comprising:
 an elastic layer;   a primer layer provided on said elastic layer; and   a parting layer provided on said primer layer,   wherein said primer layer contains a crystalline fluorocarbon polymer having a functional group and has a thickness of 850 nm or less, and   wherein said parting layer is a coating layer of a crystalline fluorocarbon polymer.   
     
     
         2 . A member according to  claim 1 , wherein said primer layer has a thickness of 360 nm or less. 
     
     
         3 . A member according to  claim 1 , wherein said primer layer and said parting layer have a total thickness of 25 μm or less. 
     
     
         4 . A fixing device comprising:
 a rotatable fixing member including an elastic layer, a primer layer provided on the elastic layer, and a parting layer provided on the primer layer; and   a back-up member for creating a fixing nip together with said rotatable fixing member,   wherein the primer layer contains a crystalline fluorocarbon polymer having a functional group and has a thickness of 850 nm or less, and   wherein the parting layer is a coating layer of a crystalline fluorocarbon polymer.   
     
     
         5 . A manufacturing method of a rotatable fixing member including an elastic layer, a primer layer and a parting layer, said manufacturing method comprising:
 a first step of applying a dispersion containing a crystalline fluorocarbon polymer having a functional group onto a surface of an elastic layer;   a second step of forming a primer layer by drying the dispersion;   a third step of decreasing a thickness of the primer layer to 850 nm or less by removing a part of the primer layer on a surface side of the parting layer; and   a fourth step of forming a parting layer by coating a crystalline fluorocarbon polymer onto the surface of the primer layer decreased in thickness and then by baking the coated crystalline fluorocarbon polymer.