olyester resin compositions comprising a saturated polyester or unsaturated polyester obtained by condensing a polyhydric alcohol such as ethylene glycol, propylene glycol, trimethylol propane, pentaerythritol or bisphenol-A with a saturated polybasic acid such as phthalic acid, phthalic anhydride, isophthalic acid, terephthalic acid or adipic acid and/or an unsaturated polybasic acid such as male