Ionizing radiation stable thermoplastic composition, method of making, and articles formed therefrom

US7812078B2 · kind B2 · utility

Assignee

• Sabic Innovative Plastics B.V. · NL

Inventors

• Katherine Glasgow · Wake Forest, US
• Brian D. Mullen · Greenwood, US
• Philippe Schottland · Sparta, US

Key dates

• Filing date: Oct 31, 2005
• Grant date: Oct 12, 2010
• Expiry date: Jun 20, 2029

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08J2469/00
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

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 C1-C20 alkyl, substituted or unsubstituted C1-C20 arylalkyl, substituted or unsubstituted C6-C20 aryl, or substituted or unsubstituted C7-C40 alkylaryl; Z is —O—, or substituted or unsubstituted —(O—C1-20—)w—O—, wherein w is 1 to 20; Ar is a C6-C62 aromatic group; m is 0-3 and n is 3-6; and each Y is independently C1-C20 alkyl, substituted C1-C20 alkyl, C6-C20 aryl, C1-C8 alkyl-substituted C6-C20 aryl, halogen, nitro, C1-C20 alkoxycarbonyl, C1-C20 alkoxy, or C1-C20 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 disclo…