| abstract |
A surface treatment agent useful for forming a layer having excellent surface slipperiness and friction durability in addition to water repellency, oil repellency and antifouling property on a substrate made of various materials including a resin. provide. A composition comprising (B) a compound containing a carbon-carbon double bond obtained by reacting (A) a polyisocyanate, which is a trimer of diisocyanate, with (B) a compound having active hydrogen. , Component (B) is (B1) perfluoropolyether having active hydrogen, (B2) silane compound having active hydrogen, and (B3) a monomer having active hydrogen and a carbon-carbon double bond, The number of moles of isocyanate groups in A) is equal to the total number of moles of component (B), and moles of component (B1), component (B2) and component (B3) with respect to 9 moles of isocyanate groups in component (A). A composition characterized in that the numbers are 0.1-2 mol of component (B1), 0.05-2 mol of component (B2), and 5-8.85 mol of component (B3), respectively. [Selection figure] None |