SURFACE-ACTIVE PHOTOINITIATORS

摘要

A process for the production of coatings with scratch-resistant durable surfaces that comprise as photoinitiator (B) in a photocurable formulation at least one surface-active photoinitiator, concentrated at the surface of the formulation, of formula (Ia) or (Ib), wherein R_a is a radical of formula (IIa), R_b is a radical of formula (IIb)), or R_a and R_b are naphthyl, anthracyl, phenanthryl or a heterocyclic radical each of which is unsubstituted or substituted; R₁, R₂, R₃, R₄, R₅, R₆, R₇, R₈, R₉ and R₁₀ are, for example, each independently of the others hydrogen; A-Y; C₁-C₁₂alkyl, halogen or phenyl; R₁₁ and R₁₂ are, for example, C₁-C₁₂ alkyl; X is -OR₂₀ or -N(R₂₁)(R₂₂); R₂₀ is, for example, hydrogen or C1-C4alkyl; R21 and R22 are, for example, hydrogen or C₁-C₁₂ alkyl; X₁ is, for example, -O-; Y is, for example, a single bond or -O-; Y₁ is, for example, a single bond; and A is, for example, C₆-C₃₀alkyl.