benzotriazole 2 2 39 hydroxy 5 39 acryloyloxyethyl phenyl benzotriazole 2 2 39 hydroxy 3 39 t butyl 5 39 methacryloyloxyethyl phenyl benzotriazole 2 2 39 hydroxy 3 39 methyl 5 39 acryloyloxyethyl phenyl benzotriazole 2 2 39 hydroxy 5 39 methacryloyloxypropyl phenyl 5 chlorobenzotriazole and 2 2 39 hydroxy 5 39 acryloyloxybutyl phenyl 5 methylbenzotriazole the ultraviolet absorbing polymer used for coating a fibrous article therewith is a homopolymer or copolymer prepared from at least one monomer selected from the monomers of the formulae 1 and 2 or a copolymer prepared from at least 5 by weight preferably at least 30 by weight of at least one of the monomers of the formulae 1 and 2 and not more than 95 by weight preferably not more than 90 by weight of at least one copolymerizable monoethylenically unsaturated monomer as preferred examples of the copolymerizable monoethylenicaly unsaturated monomers there can be mentioned acrylic acid methacrylic acid alkyl esters of acrylic acid alkyl esters of methacrylic acid alkyl vinyl ethers and vinyl esters of carboxylic acids having 2 to 18 carbon atoms the alkyl groups in these alkyl esters and ethers preferably have 1 to 18 carbon atoms the alkyl esters of acrylic acid include for example methyl acrylate ethyl acrylate propyl acrylate butyl acrylate and 2 ethylhexyl acrylate the alkyl esters of methacrylic acid include for example methyl methacrylate ethyl methacrylate propyl methacrylate butyl methacrylate and stearyl methacrylate the alkyl vinyl ethers include for example methyl vinyl ether ethyl vinyl ether butyl vinyl ether and stearyl vinyl ether the vinyl carboxylates.