PURPOSE: A releasing composition, consisting of a copolymer of a polyfluoroalkylvinyl monomer, specific silicone based vinyl monomer and specific vinyl based monomer in a specific proportion, having improved water and oil repellency and transparency and capable of exhibiting remarkable effect on silicone adhesives.
CONSTITUTION: A releasing composition for adhesives obtained by copolymeriz ing (A) 50W98pts.wt, preferably 70W95pts.wt. polyfluoroalkylvinyl monomer, preferably a compound expressed by the formula CH2=C(CH3)CO2CH2CH2C8F17, with (B) 2W50pts.wt., preferably 5W30pts.wt., silicone based vinyl monomer containing one or more hydrolyzable groups linked to Si atoms in the molecule, e.g. vinyltriethoxysilane, and (C) 0W49pts.wt. monomer copolymerizable with the component (A), e.g. methyl acrylate, in the presence of a radical reaction initiator, e.g. azobisisobutyronitrile, preferably in an organic solvent, e.g. a fluorine-containing solvent.
YAMAGUCHI KOICHI
YAMAMOTO YASUSHI
