Disclosed are triazine derivatives of formulawhereinX1 is a bivalent radical of formulaA and A′ independently from each other are unsubstituted or substituted, straight-chain or branched C1-C12alkylene, which is optionally interrupted by C5-C12cycloalkylene, N, O or S； C5-C12cycloalkylene； biphenylene； C6-C10arylene； or C5-C10arylene-(C1-C12alkylene)；R1 is a radical of formulaR2 and R3 independently from each other are hydrogen； C1-C12alkyl； OR7； NR7R8； C6-C10aryl；X2 is O, or NH；W1 is C1-C20alkyl； or a group Sp-Sil；Sp is a straight-chain or branched saturated or single or multiple unsaturated C3-C12 hydrocarbon；Sil is a silane； an oligosiloxane； or a polysiloxane moiety； andR4, R5 R6, R7, R8 and R9 independently from each other are hydrogen； C1-C12alkyl； or C3-C12cycloalkyl.
