	US 7,524,919 B2
	Polycarbonate-polysiloxane copolymers, method of making, and articles formed therefrom
James Franklin Hoover, Evansville, Ind. (US); Jan-Pleun Lens, Breda (Netherlands); and Brian Mullen, Mt. Vernon, Ind. (US)
Assigned to SABIC Innovative Plastics IP B.V., Bergen op Zoom (Netherlands)
Filed on Sep. 29, 2006, as Appl. No. 11/537,135.
Prior Publication US 2008/0081893 A1, Apr. 03, 2008
Int. Cl. C08G 64/00 (2006.01); C08G 63/02 (2006.01)

U.S. Cl. 528—196 [264/176.1; 264/219; 428/411.1; 428/412; 525/439; 525/462; 525/464; 528/25; 528/29; 528/198]

26 Claims

1. A copolycarbonate comprising

90 to 100 mol % of units derived from a cycloalkylidene-bridged alkyl-substituted bisphenol of the formula

wherein R^a′ and R^b′ are each independently C_1-12alkyl, T is a C_5-16cycloalkylene, or a C_5-16cylcloalkylidene, and r and s are each independently 1 to 4;

2 to 35 wt % of units derived from a polysiloxane diol of the formulas

or a combination thereof, wherein Ar is a substituted or unsubstituted C_6-36arylene group, each R is the same or different C_1-13monovalent organic group, each R⁶is the same or different divalent C₁-C₃₀organic group, and E is an integer from 40 to 60; and

0 to 10 mol % of units derived from a dihydroxy aromatic compound of formula

wherein R^aand R^bare each independently halogen or C_1-12alkyl group, X^ais a C_1-18organic group, p and q are each independently integers of 0 to 4, and the dihydroxy aromatic compound is not the same as the cycloalkylidene-bridged bisphenol or the polysiloxane diols; and

wherein each of the foregoing mole percents is based on the total moles of bisphenol of formula (1) and dihydroxy aromatic compound of formula (3) used to manufacture the copolycarbonate, and the weight percent is based on the total weight of the bisphenol of formula (1), polysiloxane diols of formula (2a) and/or (2b), and dihydroxy aromatic compound of formula (3) used to manufacture the copolycarbonate.