performance to both of samples 22 and 24 of the present invention coffee stain protection was tested with coffee at a temperature of 71 u00b0 c i e with hot coffee the samples in table 3 demonstrate that having a glass transition temperature and or a melt temperature greater than 71 u00b0 c is not required of the copolymer in order to achieve hot coffee stain protection while vinyl ether maleic anhydride copolymers are considered the best mode of practicing this invention it was also found that acrylate maleic anhydride copolymers offer coffee stain protection homoacrylates however did not protect against coffee stains see table 2 and although the protection offered by the copolymer of sample 17 is only 4 this sample is included as part of the present invention since it was not an optimized structure the monomers 39 ratio could probably be varied to provide improved performance the naphthoxy containing copolymers yellowed upon exposure to ultra violet uv light even when the oxygen in the naphthoxy or 5 6 7 8 tetrahydro 2 naphthoxy ring of the above mentioned copolymers was etherified see table 4 a phenoxy ring linked from the phenoxy oxygen phenyl o to the vinyl ether oxygen o ch u2550 ch2 by a ch2ch2 group phenyl o.