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:
Jul. 15, 2025
Filed:
Mar. 24, 2021
Method of preparing low haze polymer compositions for use in high refractive index optical materials
Ppg Industries Ohio, Inc., Cleveland, OH (US);
Barry R. Havens, Pensacola, FL (US);
Darrin R. Dabideen, Pittsburgh, PA (US);
Matthew S. Luchansky, Wexford, PA (US);
Nigel D. Kidder-Wolff, Somerville, MA (US);
PPG Industries Ohio, Inc., Cleveland, OH (US);
Abstract
A method of preparing a low bubbling and low yellowing, high refractive index polyurethane or polythiourethane is provided. A method of evaluating an aromatic polyiso(thio)cyanate material, such as an aromatic diisocyanate, e.g., m-xylylene cyanate, is provided. The method evaluates transmittance in a sample of the isocyanate to determine if the aromatic polyiso(thio)cyanate material will lead to unacceptable bubbling or yellowing in a high refractive index or high Abbe number polymer composition.