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:
Oct. 09, 2001
Filed:
Aug. 17, 2000
Gary D. Parsons, Midland, MI (US);
James P. Maher, Freeland, MI (US);
The Dow Chemical Company, Midland, MI (US);
Abstract
The present invention relates to a process for producing DVD's using injection molding techniques, without the use of compression, from a polymer having a glass transition temperature (Tg) of greater than 110° C. as measured by Differential Scanning Calorimetry (DSC) at 10° C./min., an elastic modulus (G′) of less than or equal to 1000 dynes/cm,at a temperature of 240° C., as measured by Dynamic Mechanical Spectroscopy measurements at a temperature ramp rate of 3° C./min., and a shear rate of 1 radian/sec using a parallel plate geometry (under nitrogen), and a complex viscosity (Eta*) of less than 2000 poise, as measured according to Dynamic Mechanical Spectroscopy measurements, using shear rate sweeps at 280° C., and a shear rate of 1 radian/sec using a parallel plate geometry (under nitrogen).