| 摘要 |
A copolyester having an inherent viscosity of equal to or greater than about 0.3 formed from about 20 to about 60 mole percent based on the amount of aromatic dicarboxylic acid of one or more of isophthalic dicarboxylic acid or an alkyl diester thereof, about 40 to about 80 mole percent based on the amount of aromatic dicarboxylic acid of one or more of terephthalic acid or 2,6-naphthalene dicarboxylic acid or an alkyl diester thereof, about 10 to about 60 mole based on the total amount of dicarboxylic acids of one or more aliphatic dicarboxylic acids or an alkyl diester, about 0.1 to about 5 mole percent based on the moles of total dicarboxylic acid of one or more alkali or alkaline earth metal salts of 5-sulfoisophthalic dicarboxylic acid or an alkyl diester thereof, about 90 to 100 mole percent based on the total amount of glycols of one or more aliphatic glycols, and 0 to about 10 mole percent based on the total amount of glycols of one or more of di(ethylene glycol) and tri(ethylene glycol). The copolyesters are useful to form films and coatings.
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