| US 7,498,388 B2 | ||
| Polysiloxane-polycarbonate copolymer article | ||
| Gary Charles Davis, Albany, N.Y. (US); James Alan Mahood, Evansville, Ind. (US); Matthew Robert Pixton, Mt. Vernon, Ind. (US); Niles Richard Rosenquist, Evansville, Ind. (US); James Manio Silva, Clifton Park, N.Y. (US); and Joshua James Stone, Worcester, N.Y. (US) | ||
| Assigned to SABIC Innovative Plastics IP B.V., Bergen op Zoom (Netherlands) | ||
| Filed on Apr. 10, 2006, as Appl. No. 11/401,171. | ||
| Prior Publication US 2007/0238846 A1, Oct. 11, 2007 | ||
| Int. Cl. C08F 283/02 (2006.01) | ||
| U.S. Cl. 525—464 | 21 Claims |
| 1. An article, comprising:
a thermoplastic composition comprising
a polysiloxane-polycarbonate copolymer, wherein the copolymer comprises repeating diorganosiloxane units of formula (1):
 wherein each R is, independently, a C1-13 monovalent organic group, each occurrence of R1 is independently a divalent C1-C30 alkylene, and E has an average value of about 20 to about 35;
wherein the article is transparent and has a dimension that is greater than or equal to about 1.5 cm;
wherein the thermoplastic composition is defined in that an ⅛th inch thick bar formed from the thermoplastic composition has a B-Y ratio of less than or equal to about 1.75, wherein the
B-Y ratio is determined as a B-Y span of a molded part formed from the thermoplastic composition divided by a B-Y span of
a molded part formed from a siloxane-free thermoplastic composition, the siloxane-free thermoplastic composition having a
composition identical to that of the thermoplastic composition except for the omission of the diorganosiloxane units; and
wherein the thermoplastic composition has about 2 wt % to about 6 wt % polysiloxane.
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