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We investigate the role of a certain class of QCD corrections to electroweakvector boson scattering at small scattering angles and large energies. Theseare present since, from the perturbative analysis, the vector bosons maydissociate into quark-antiquark pairs giving rise to colour dipoles interactingthrough gluon exchanges. After the computation of the vector boson impactfactors, we present expressions for the lowest order QCD scattering amplitudeand for the leading logarithmic BFKL amplitude. Particularly we discussnumerical results for the process $\gamma\gamma\to ZZ$. The QCD corrections tothe cross section resulting from the interference with the electroweak ones areestimated and compared with the leading pure electroweak part. Correctionsresulting from the leading log BFKL amplitude are of the order of few percentalready at the $0.5 - 1$ TeV energy range.Comment: 21 pages,9 figures, discussion on the helicity-flip impact factors  added, typos correcte

QCD corrections to electroweak vector boson scattering at small scattering angles