The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 05, 2009
Filed:
Oct. 28, 2005
Gautam Chatterjee, Bangalore, IN;
Patrick J. Mccloskey, Watervliet, NY (US);
Warren W. Reilly, Northville, NY (US);
William D. Richards, Scotia, NY (US);
Subash Scindia, Bangalore, IN;
Gokul Srinivasan, Bangalore, IN;
Yatin Tayalia, Bangalore, IN;
Gautam Chatterjee, Bangalore, IN;
Patrick J. McCloskey, Watervliet, NY (US);
Warren W. Reilly, Northville, NY (US);
William D. Richards, Scotia, NY (US);
Subash Scindia, Bangalore, IN;
Gokul Srinivasan, Bangalore, IN;
Yatin Tayalia, Bangalore, IN;
SABIC Innovative Plastics IP B.V., Bergen op Zoom, NL;
Abstract
A method for producing a transparent article comprises the steps of melt transesterifying a monomer mixture in the presence of a transesterification catalyst to produce a hydroquinone polycarbonate copolymer product comprising greater than 45 mole percent of structural units derived from the hydroquinone. The monomer mixture comprises a hydroquinone, at least one aromatic dihydroxy compound other than the hydroquinone, and a carbonic acid diester. The hydroquinone polycarbonate copolymer product is then heated to a highest processing temperature of 5° C. to 20° C. above a maximum melting melt temperature for the hydroquinone copolymer product for a sufficient period of time to render the hydroquinone polycarbonate copolymer product transparent upon cooling to ambient temperature; and cooling the hydroquinone polycarbonate copolymer product to produce the transparent article. The method can also be used for producing transparent hydroquinone polycarbonate copolymers, which can be used for producing the transparent articles.