Radiation-cured composition for adhesive-repellent coatings

摘要

Radiation-hardening compositions (RHC), containing (A)linear organopolysiloxanes of formula R<1>aR3-aSiO(R2SiO)c-R<3>Si-Y-SiR<2>O-(SiOR<2>O)cdSiR3-bR<1>b (I) with (meth)acryloxy groups, in which R = optionally substituted 1-18C hydrocarbyl with no terminal aliphatic C-C multiple bonds; R<1> = a group of formula (R<1>); z = 1-10; R<2> = hydrogen or methyl; R<3>, R<4> = 1-6C alkylene; Y = a divalent organic residue with no terminal aliphatic C-C multiple bonds; a, b = 0 or 1; a + b = 1 or 2, with an average value of 1.3-1.9; c = 1-1000; d = 0 or 1-10; and (B) photosensitisers. Also claimed are (i) a process for the production of adhesive-repellent coatings by applying RHC to the substrate surface and then hardening the coating by irradiation; (ii) polysiloxanes (I), and (iii) linear polysiloxanes of formula (II) with hydrogen atoms attached to silicon, i.e. formula (I) with H instead of R<1>; (iv) a photosensitiser-containing mixture of 10-40 wt% oligo-2-hydroxy-2-methyl -1-(4-(1-methylvinyl)- phenyl)-propanone and 90-60 wt% (meth)acryloxy group-containing polysiloxane of formula R<1>R<2>SiO(R<2>SiO)nSiR<2>R<1> (III), in which n = 5-30.