can be any monomer having a polymerizable unsaturated group such as styrene acrylonitrile methacrylic esters acrylic esters butadiene isoprene vinyl chloride chloroprene or other vinyl monomers compared to compounds with the vinyl group in the phenol ring the vinyl group on the benzotriazole ring make the incorporation of the monomer of the present invention easier to the olefinic copolymer such as styrene acrylic ester copolymer it is possible to understand the character by its relatively active radical character it is also possible to use polyvinyl compounds such as divinyl monomer and vinylidene monomers and other compounds having u03b1 u03b2 unsaturated group usual grafting polymerization on the polymer in bulk or solution can provide the polymeric ultraviolet absorbers the homopolymers of the benzotriazole monomer or the copolymer having relatively high contents of benzotriazole monomer unit can be used as addition type ultraviolet absorbers for synthetic resins and other products the copolymers having relatively low content of benzotriazole monomer units are effective as polymers having ultraviolet absorbancy the benzotriazole monomer is used as a reactive type ultraviolet absorber in the latter case the ratio of the benzotriazole unit to polymer can be low for example the copolymer having ultraviolet absorbancy can be obtained by incorporating.