Chemical compositions for authenticatable polymers and articles, and authentication methods thereof

US7230113B2 · kind B2 · utility

Assignee

• General Electric Company · US

Inventors

• Yogendrasinh Bharatsinh Chauhan · Valsad, IN
• Adil Minoo Dhalla · Mumbai, IN
• Sriramakrishna Maruvada · Evansville, US
• Shantaram Narayan Naik · Savanuru, IN
• Vandita Pai-Paranjape · Evansville, US
• Kiran Puthamane · Jamkhed, IN
• Meerakani Mohamed Ali Sait · Tirunelveli, IN
• Philippe Schottland · Sparta, US
• Ganapati Shankarling · Savanuru, IN

Key dates

• Filing date: Dec 17, 2004
• Grant date: Jun 12, 2007
• Expiry date: Mar 30, 2025

Classification

• Technology area (CPC G): Physics
• CPC primary: G11B20/00608
• WIPO field: Audio-visual technology
• WIPO sector: Electrical engineering

Abstract

Disclosed are compositions comprising at least one [benzo[4,5]imidazo(heterocycle)] compound, said [benzo[4,5]imidazo(heterocycle)] compound selected from the group consisting of structures I and II,wherein R1 and R2 are independently selected from the group consisting of a hydrogen atom, electron withdrawing group, organic group, divalent 1,2-cycloalkylidene group, or combinations thereof; “q” is independently an integer from 1–4, L is a linking group, and “r” is independently 0 or 1; said at least one [benzo[4,5]imidazo(heterocycle)] compound being present at a concentration sufficient to cause said composition to exhibit upon exposure to an excitation radiation having a wavelength of from about 330 nanometers to about 390 nanometers, a maximum fluorescence emission wavelength of greater than or equal to about 470 nanometers; and a Stokes shift of greater than or equal to about 80 nanometers; wherein the wavelengths are measured in bisphenol A polycarbonate matrix.