The Dow Chemical Company

Deborah E Plaver

Mark F Sonnenschein

Daniel James Falla

Paul J Moses

Kevin L Nichols

Michael L Mounts

A synthetic cork closure having at least a portion thereof coated with a gas impermeable polymer coating composition.

Gas permeation resistant synthetic cork closure

Polymer blend compositions are prepared having excellent combinations of optical properties, physical properties and hydrolytic stability comprising, in admixture, (a) a diaryl fluorene carbonate polymer and (b) a polysulfone. Preferably, the diaryl carbonate polymer is a copolycarbonate of bisphenol A with bis(hydroxyphenyl) fluorene, preferably 9,9-bis(4-hydroxyphenyl) fluorene. Optionally, the blend compositions also comprise a second non-fluorene carbonate polymer (c). Preferably, the polysulfone is a bisphenol A polysulfone or a polyether poly sulfone. In preferred aspects of this invention, the polysulfone and diaryl carbonate polymer components are selected to provide a transparent blend composition.

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Midland, MI, United States of America

Deborah E Plaver