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Poly(ethylene terephthalate) films have been used widely as substrates in recording media, like iron-oxide-doped polyurethane layers.
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Uv-Light Treatment of Poly(ethylene Terephthalate) Films
Poly(ethylene terephthalate) films have been used widely as substrates in
recording media, like iron-oxide-doped polyurethane layers.
Poly(ethylene terephthalate) films are, however, well known for poor
adhesive power to other media, like the polyurethane. A UV-light treatment can
increase adhesive power of poly(ethylene terephthalate) films, in particular to
polyurethane. Poly(ethylene terephthalate) is known to undergo a photo-Fries
reaction, and photo-oxidation to have mono- and dihydroxy terephthalate moiety
under UV-exposure in air; these hydroxy groups may provide reactive sites to
polyurethane with NH-groups.