Binding Bisphenol A in a polycarbonate container
AssigneeInternational Business Machines Corporation
InventorsTravis R. Hebig, Joseph Kuczynski, Robert E. Meyer, III, Steven R. Nickel
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Abstract
Embodiments of the disclosure provide a method for removing residual BPA from a residual BPA-containing substance and a method for making a container with residual BPA removed. The method may consist of preparing a stabilization reagent, wherein water is removed from the stabilization reagent. The method may also include preparing the residual BPA-containing substance. The method may also include reacting the residual BPA-containing substance in a melt condensation process with the stabilization reagent, wherein the stabilization reagent is non-toxic.
Claims19
A method of removing residual BPA from a residual BPA-containing substance, consisting of:
- preparing a stabilization reagent that reacts with BPA, the stabilization reagent is non-toxic and a compound of the general formula:
- AxDyAz where A is a carboxyl group or an ester, x is zero or an integer, D is a carbon chain, y is an integer of the value 3, 5, or 6-33, z is an integer;
- removing water from the stabilization reagent by a drying operation, the drying operation includes preheating the stabilization reagent, the preheating occurs at a temperature above 100 C and below the glass transition temperature of the residual BPA-containing substance;
- preparing the residual BPA-containing substance;
- and
- reacting the residual BPA-containing substance in a melt condensation process with the stabilization reagent.
Dependencies are inferred from the claim text.