Polycarbonate compositions

A film, sheet or molded article comprising a composition comprising a polycarbonate and one or more additives selected from the group consisting of benzofuranone stabilizers of formula I:

• wherein:
• R1, R2, R3, R4 and R5 are each independently hydrogen, halogen, hydroxy, C1-C25alkyl, C2-C25alkenyl, C2-C25alkynyl, C7-C9phenylalkyl, phenyl, C5-C25cycloalkyl, C1-C18alkoxy, C1-C8alkylamine, di(C1-C8alkyl)amino, C1-C25alkanoyloxy, C1-C25alkanoylamino, C3-C25alkenoyloxy or C3-C25alkanoyloxy interrupted by one to three —O—, —S—, —NH— or —N(C1-C8alkyl)-;
• and
• C1-C25alkyl, C2-C25alkenyl, C2-C25alkynyl, C7-C9phenylalkyl, phenyl, C5-C8cycloalkyl, C1-C15alkoxy, C1-C8alkylamine, di(C1-C8alkyl)amino, C1-C25alkanoyloxy, C1-C25alkanoylamino, C3-C25alkenoyloxy, and interrupted C3-C25alkenoyloxy are unsubstituted or substituted by one to three groups selected from the group consisting of halogen, hydroxy, thiol, amino, C1-C4alkylamino di(C1-C4alkyl)amino, and C1-C4alkyl.

A method of stabilizing polycarbonate against the deleterious effects of heat, light and oxygen, the method comprising incorporating into a polycarbonate one or more additives selected from the group consisting of benzofuranone stabilizers of formula I:

• wherein:
• R1, R2, R3, R4 and R5 are each independently hydrogen, halogen, hydroxy, C1-C25alkyl, C2-C25alkenyl, C2-C25alkynyl, C7-C9phenylalkyl, phenyl, C5-C8cycloalkyl, C1-C18alkoxy, C1-C5alkylamine, di(C1-C8alkyl)amino, C1-C25alkanoyloxy, C1-C25alkanoylamino, C3-C25alkenoyloxy or C3-C25alkanoyloxy interrupted by one to three —O—, —S—, —NH— or —N(C1-C8alkyl)-;
• and
• C1-C25alkyl, C2-C25alkenyl, C2-C25alkynyl, C7-C9phenylalkyl, phenyl, C5-C8cycloalkyl, C1-C18alkoxy, C1-C8alkylamine, di(C1-C8alkyl)amino, C1-C25alkanoyloxy, C1-C25alkanoylamino, C3-C25alkenoyloxy, and interrupted C3-C25alkenoyloxy are unsubstituted or substituted by one to three groups selected from the group consisting of halogen, hydroxy, thiol, amino, C1-C4alkylamino di(C1-C4alkyl)amino, and C1-C4alkyl.

An additive composition comprising one or more organophosphorus stabilizers and one or more benzofuranone stabilizers of formula I:

• wherein:
• R1, R2, R3, R4 and R5 are each independently hydrogen, halogen, hydroxy, C1-C25alkyl, C2-C25alkenyl, C2-C25alkynyl, C7-C9phenylalkyl, phenyl, C5-C8cycloalkyl, C1-C18alkoxy, C1-C8alkylamine, di(C1-C8alkyl)amino, C1-C25alkanoyloxy, C1-C25alkanoylamino, C3-C25alkenoyloxy or C3-C25alkanoyloxy interrupted by one to three —O—, —S—, —NH— or —N(C1-C8alkyl)-;
• and
• C1-C25alkyl, C2-C25alkenyl, C2-C25alkynyl, C7-C9phenylalkyl, phenyl, C5-C8cycloalkyl, C1-C15alkoxy, C1-C8alkylamine, di(C1-C8alkyl)amino, C1-C25alkanoyloxy, C1-C25alkanoylamino, C3-C25alkenoyloxy, and interrupted C3-C25alkenoyloxy are unsubstituted or substituted by one to three groups selected from the group consisting of halogen, hydroxy, thiol, amino, C1-C4alkylamino di(C1-C4alkyl)amino, and C1-C4alkyl.