Ionizing radiation stable thermoplastic composition, method...

Details Ionizing radiation stable thermoplastic composition, method... Ionizing radiation stable thermoplastic composition, method...

2005-10-31

2010-10-12

Cain, Edward J (Department: 1796)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

C524S158000

Reexamination Certificate

active

07812078

ABSTRACT:
A thermoplastic composition comprises a polycarbonate, and an aromatic sulfonate compound of formulain-line-formulae description="In-line Formulae" end="lead"?(Y)m—Ar—(Z—S(O)2—X)nin-line-formulae description="In-line Formulae" end="tail"?wherein each X is independently a substituted or unsubstituted C1-C20alkyl, substituted or unsubstituted C1-C20arylalkyl, substituted or unsubstituted C6-C20aryl, or substituted or unsubstituted C7-C40alkylaryl; Z is —O—, or substituted or unsubstituted —(O—C1-20—)w—O—, wherein w is 1 to 20; Ar is a C6-C62aromatic group; m is 0-3 and n is 3-6; and each Y is independently C1-C20alkyl, substituted C1-C20alkyl, C6-C20aryl, C1-C8alkyl-substituted C6-C20aryl, halogen, nitro, C1-C20alkoxycarbonyl, C1-C20alkoxy, or C1-C20acyl, and further wherein a molded article having a thickness of 3.2±0.12 millimeters and consisting of the polycarbonate, aromatic sulfonate compound, and an effective amount of each of a mold-release agent and an antioxidant has, after exposure to a total gamma radiation dose of 83 kGy and when measured according to ASTM D1925-70, an increase in yellowness index (dYI) of less than or equal to 45, when compared to the unexposed molded article. Methods of making the thermoplastic composition, and articles prepared therefrom, are also disclosed.

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