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:
Feb. 08, 2000
Filed:
Apr. 07, 1999
Kazushige Inoue, Moka, JP;
Hiromi Ishida, Moka, JP;
Tomoaki Shimoda, Chiba Prefecture, JP;
Theodorus L Hoeks, Bergen op Zoom, NL;
Henricus H van Hout, Halsteren, NL;
Monica M Marugan, Bergen op Zoom, NL;
David M Dardaris, Ballston Spa, NY (US);
Patrick J McCloskey, Watervliet, NY (US);
General Electric Company, Schenectady, NY (US);
Abstract
Increasing the endcap level to a level greater than about 90% for Optical Quality (OQ) Melt Polycarbonate significantly reduces the as-molded static charge for injection molded parts for Optical Disc applications. The use of resins with higher endcap levels in combination with antistatic additives provides a highly robust formulation suitable for even the most demanding emerging formats as Digital Versatile Disc (DVD) and in all commercial Optical media molding machines. Thus, optical quality polycarbonates are prepared by performing a base-catalyzed polymerization of a diaryl carbonate and a dihydric phenol under conditions effective to produce a polycarbonate product having an endcap level of 90% or greater.