Orthodontic articles comprising polymerized composition comprising at least two free-radical initiators

US11904031B2 · kind B2 · utility

Assignee

• 3M INNOVATIVE PROPERTIES COMPANY · US

Inventors

• Saswata Chakraborty · Cottage Grove, US
• Benjamin C. MacMurray · Minneapolis, US
• Eric W. Nelson · Stillwater, US
• Thomas P. Klun · Lakeland, US
• Richard J. Pokorny · Maplewood, US
• Wayne S. Mahoney · Windom, US
• Chad M. Amb · Roberts, US
• George W. Griesgraber · Eagan, US
• Dana R. Reed · Minneapolis, US
• Ahmed S. Abuelyaman · Woodbury, US
• Robert S. Clough · Windom, US
• James D. Hansen · White Bear Lake, US
• Daniel J. Skamser · Albuquerque, US
• Ian Dailey · Maplewood, US
• John M. Riedesel · San Jose, US

Key dates

• Filing date: Nov 20, 2018
• Grant date: Feb 20, 2024
• Expiry date: Jun 21, 2041

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08L75/14
• WIPO field: Pharmaceuticals
• WIPO sector: Chemistry

Abstract

An orthodontic article is described comprising the reaction product of a free-radically polymerizable resin; a first free-radical photoinitiator having sufficient absorbance at a first wavelength range; and a second free-radical initiator selected from a second photoinitiator having sufficient absorbance at a second wavelength range, wherein the second wavelength range is different than the first wavelength range, or a thermal free-radical initiator. In some embodiments, the first free-radical photoinitiator exhibits a maximum absorbance at a wavelength of the range of 370-380 nm or 320-330 nm and/or comprises photoinitiator groups selected from acyl phosphine oxide or alkyl amine acetophenone. Also described are photopolymerizable compositions and methods.