The invention relates to a biocidal composition comprising at least one nanoscalemetal oxide of the transition elements and at least one organic biocidal compound.The invention further relates to a resin composition comprising at least oneaminoplast and a biocidal composition according to the invention. The inventionalso relates to composite materials and laminates containing the disclosedbiocidal composition or the disclosed resin composition such that the surfacesthereof have biocidal properties.