Method of producing fluorosilicone rubber laminate, and fluorosilicone rubber laminate

A method of producing a fluorosilicone rubber laminate, the method comprising:

• (1) applying a primer composition onto a substrate, and then forming a primer layer on a surface of the substrate by drying or curing the primer composition;
• and
• (2) bringing a fluorosilicone rubber composition into contact with the primer layer, and then adhering a fluorosilicone rubber to the primer layer by curing the fluorosilicone rubber composition;
• wherein:
• the primer composition does not simultaneously comprise a platinum-based catalyst and a fluorosiloxane containing a silicon atom-bonded hydrogen atom;
• and
• wherein one of the following provisos I) or II) is true:
• I) the fluorosilicone rubber composition comprises:
• (a) (a1) an organopolysiloxane having at least 2 alkenyl groups in a molecule, wherein at least 20 mol % of all silicon atom-bonded organic groups are fluoroalkyl groups, or
• a mixture of component (a1) and (a2) an organopolysiloxane having at least 2 alkenyl groups and having no fluoroalkyl groups or having fluoroalkyl groups in an amount that is less than 20% of all silicon atom-bonded organic groups in a molecule;
• (b) an organic peroxide;
• and
• (c) a platinum-based catalyst;
• and
• wherein the primer composition comprises:
• (d) a fluorosiloxane containing a silicon atom-bonded hydrogen atom;
• (e) an alkoxysilane and/or a partially hydrolyzed condensate thereof;
• and
• (f) a condensation-reaction catalyst;
• II) the fluorosilicone rubber composition comprises:
• (a) (a1) an organopolysiloxane having at least 2 alkenyl groups in a molecule, wherein at least 20 mol % of all silicon atom-bonded organic groups are fluoroalkyl groups, or
• a mixture of component (a1) and (a2) an organopolysiloxane having at least 2 alkenyl groups and having no fluoroalkyl groups or having fluoroalkyl groups in an amount that is less than 20% of all silicon-bonded organic groups in a molecule;
• (c) a platinum-based catalyst;
• and
• (d) a fluorosiloxane containing a silicon atom-bonded hydrogen atom;
• and
• wherein the primer composition comprises:
• (d) a fluorosiloxane containing a silicon atom-bonded hydrogen atom;
• (e) an alkoxysilane and/or a partially hydrolyzed condensate thereof;
• and
• (f) a condensation-reaction catalyst.