use in the composition the preferable wavelength range for the photoactive crosslinking agents disclosed above is 400 to 250 nm the radiant energy in this preferred range of wavelengths required to crosslink the adhesive film of the invention is 100 to 1500 millijoules cm 2 and more preferably 200 to 800 millijoules cm 2 details of the photocure process are disclosed in u s pat nos 4 181 752 and 4 329 384 the adhesives of the present disclosure are particularly useful for forming strong bonds to low surface energy lse substrates as used herein low surface energy substrates are those having a surface energy of less than about 45 dynes per centimeter more typically less than about 40 dynes per centimeter and most typically less than about 35 dynes per centimeter included among such materials are polypropylene polyethylene e g high density polyethylene or hdpe polystyrene and poly methyl methacrylate pmma other substrates may also have properties of low surface energy due to a residue such as an oil residue or a film such as paint being on the surface of the substrate however even though the present adhesive bonds well to low surface energy surfaces the invention is not limited to being bonded to low.