Ionizing radiation stable thermoplastic composition, method of making, and articles formed therefrom
申请人:Glasgow Katherine
公开号:US20070100038A1
公开(公告)日:2007-05-03
A thermoplastic composition comprises a polycarbonate, and an aromatic sulfonate compound of formula
(Y)
m
—Ar-(Z-S(O)
2
—X)
n
wherein each X is independently a substituted or unsubstituted C
1
-C
20
alkyl, substituted or unsubstituted C
1
-C
20
arylalkyl, substituted or unsubstituted C
6
-C
20
aryl, or substituted or unsubstituted C
7
-C
40
alkylaryl; Z is —O—, or substituted or unsubstituted —(O—C
1-20
—)
w
—O—, wherein w is 1 to 20; Ar is a C
6
-C
62
aromatic group; m is 0-3 and n is 3-6; and each Y is independently C
1
-C
20
alkyl, substituted C
1
-C
20
alkyl, C
6
-C
20
aryl, C
1
-C
8
alkyl-substituted C
6
-C
20
aryl, halogen, nitro, C
1
-C
20
alkoxycarbonyl, C
1
-C
20
alkoxy, or C
1
-C
20
acyl, 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.