US 7,321,014 B2
Transparent compositions, methods for the preparation thereof, and articles derived therefrom
Katherine Glasgow, Evansville, Ind. (US); Brian Mullen, Mt. Vernon, Ind. (US); and Paul D. Sybert, Evansville, Ind. (US)
Assigned to General Electric Company, Schenectady, N.Y. (US)
Filed on Dec. 29, 2004, as Appl. No. 11/25,249.
Prior Publication US 2006/0142527 A1, Jun. 29, 2006
Int. Cl. C08L 69/00 (2006.01); C08L 83/10 (2006.01)
U.S. Cl. 525—464  [525/446; 528/286; 528/26; 528/29] 31 Claims
 
1. A composition comprising:
a first copolymer comprising
aromatic ester units of formula (1)

OG Complex Work Unit Drawing
wherein T is a divalent aromatic radical and D1 is a divalent organic radical, and carbonate units of formula (2)

OG Complex Work Unit Drawing
wherein at least 60% of the total number of D2 groups are divalent aromatic organic radicals and the balance thereof are divalent aliphatic, alicyclic, or aromatic radicals;
a second copolymer comprising carbonate units of formula (2) and repeating siloxane units of formula (3)

OG Complex Work Unit Drawing
wherein each occurrence of R3 is independently C1-C12 hydrocarbyl, and the second copolymer has a haze of less than or equal to 30%, measured according to ASTM D1003-00 at a thickness of 3.2 millimeters; and
a transesterification catalyst,
wherein a reaction product derived from the composition has a haze of less than or equal to 30%, measured according to ASTM D1003-00 at a thickness of 3.2 millimeters.