US 7,544,745 B2
Flame retardant thermoplastic polycarbonate compositions, method of manufacture, and method of use thereof
Shiping Ma, Tochigi-ken (Japan); Srinivas Siripurapu, Evansville, Ind. (US); Pei Sun, Shanghai (China); and Wayne Yao, Shanghai (China)
Assigned to SABIC Innovative Plastics IP B.V., Bergen op Zoom (Netherlands)
Filed on Oct. 25, 2005, as Appl. No. 11/258,412.
Prior Publication US 2007/0093591 A1, Apr. 26, 2007
Int. Cl. C08L 69/00 (2006.01)
U.S. Cl. 525—196  [525/233; 525/234; 525/237; 525/241; 528/196; 524/115] 22 Claims
 
1. A thermoplastic composition comprising in combination
a polycarbonate component;
an impact modifier composition, the components comprising
a) a bulk polymerized ABS;
b) an impact modifier different from the ABS; and
a flame retardant,
wherein b) comprises an elastomeric phase comprising a butadiene rubber, an ethylene-propylene-diene monomer rubber, an elastomeric copolymer of a C1-8 alkyl (meth)acrylate with butadiene, or a combination comprising at least one of the foregoing elastomers, together with a rigid copolymer phase derived from the copolymerization of a monomer of formula (9):

OG Complex Work Unit Drawing
wherein each Xc is independently hydrogen, C1-C12 alkyl, C3-C12 cycloalkyl, C6-C12 aryl, C7-C12 aralkyl, C7-C12 alkaryl, C1-C12 alkoxy, C3-C12 cycloalkoxy, C6-C12 aryloxy, chloro, bromo, or hydroxy, and R is hydrogen, C1-C5 alkyl, bromo, or chloro, with a monomer of the generic formula (10):

OG Complex Work Unit Drawing
wherein R is hydrogen, C1-C5 alkyl, bromo, or chloro, and Xc is cyano, C1-C12 alkoxycarbonyl, C1-C12 aryloxycarbonyl, or hydroxycarbonyl,wherein the composition is capable of achieving a UL94 rating of V0 at a thickness of 1.5 mm, and wherein the composition has a notched Izod Impact of greater than about 300 J/m, determined at 23° C. using a one-eighth inch (3.2 mm) thick bar per ASTM D256.