Molded fluoroelastomer with excellent detachability and process for producing the same

A fluorine-containing elastomer molded article comprising a fluorine-containing elastomer substrate containing a fluorine-containing elastomer as a major component of the fluorine-containing elastomer substrate and a white filler, and a coating layer on a surface of the substrate, wherein the coating layer has a peeling strength of not more than 200 gf/10 mm as measured under the following Conditions (1) and an etching rate of not more than 13 nm/sec when irradiating the molded article with an oxygen plasma as measured under the following Conditions (2):

• Conditions (1)
• A coated sheet of 2 mm thick×10 mm wide×60 mm long is put between two stainless steel metal plates and a load is applied thereto uniformly, followed by allowing to stand at 150° C. for 72 hours in a state that the thickness of the coated sheet is compressed to 81.5%, and then air cooling in the compressed state;
• the coated sheet is then separated from the metal plate at a rate of 2 mm/mm and a peeling strength between the surface coated layer and the metal plate at that time is measured;
• Conditions (2)
• Irradiation conditions:
• Oxygen (O2) plasma irradiation treatment
• Gas flow:
• 16 sccm
• RF output:
• 800 W
• Pressure:
• 20 mTorr
• Frequency:
• 13.56 MHz
• Irradiation operation:
• In order to stabilize an atmosphere in a chamber of a plasma irradiation device, discharging actually with an oxygen plasma is carried out for five minutes for pre-treatment inside the chamber;
• then the coated sheet is disposed around a center of RF electrode, and is irradiated under the above-mentioned irradiation conditions:
• Measurement of etching rate:
• An amount of weight reduction per unit area is measured up to two decimals (0.01 mg) with an electronic balance, and is round to one decimal;
• the measured amount of weight reduction per unit area is substituted for the following equation to calculate an etching rate:
• Etching rate (nm/sec)
• =Amount of weight reduction per unit area (g/cm2)
• ÷Specific weight of a resin to be coated (g/cm3)
• ÷Plasma irradiation time (sec)×107.