ビスフェノールA
BPA (Bisphenol A) is the monomer used to manufacture polycarbonate plastic and epoxy resins used as a lining in most food and beverage cans. BPA global capacity is in excess of per year and thus is one of the highest-volume chemicals produced worldwide. The ester bonds in the BPA-based polycarbonates could be subject to hydrolysis and leaching of BPA. But in the case of epoxypolymers formed from bisphenol A, it is not possible to release bisphenol A by such a reaction. It is also noteworthy that, of the bisphenols, bisphenol A is a weak xenoestrogen. Other compounds, such as bisphenol Z, have been shown to have stronger estrogenic effects in rats.