| 摘要 |
Polycarbonate compositions having improved barrier properties; i.e., low water vapor transmission and low gas permeability, are derived from monomers of the general formula (FORMULA) wherein X or Y or both are alkyl, and W is -S-,-O-,-SO2-,-SO- or a hydrocarbon radical such as alkylene, alkylidene and cycloalkylidene. They are especially useful for making food and beverage containers. |
