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US 4,996,248 AGranted
Enhancing color stability to sterilizing radiation of polymer compositions
AssigneeGeneral Electic Company
InventorsLinda H. Nelson, Roger W. Avakian, Arnold Factor
Life of this patent
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Abstract
Compounds having defined functional groups are described which color stabilize aromatic carbonate polymers or blends therewith upon exposure to sterilizing radiation.
Claims1
A method for sterilizing an aromatic carbonate polymer, said method comprising:
- (i) imparting enhanced stability against sterilizing radiation to an aromatic carbonate polymer, comprising admixing an effective amount of a pyran compound effective to inhibit yellowing upon exposure to sterilizing radiation, said pyran compound is selected from the group consisting of hydrogenated pyran, non-hydrogenated pyran and substituted pyran wherein said substituted pyran has a substituent selected from the group consisting of alkyl, aryl, alkoxy and aryloxy, said substituent being positioned on any carbon atom in the pyran ring, and
- (ii) exposing said aromatic carbonate polymer to sterilizing radiation.
Dependencies are inferred from the claim text.