Compositions including alpha-alumina particles and methods of their use

US11447657B2 · kind B2 · utility

Assignee

• 3M INNOVATIVE PROPERTIES COMPANY · US

Inventors

• Thomas P. Klun · Lakeland, US
• Chunjie Zhang · Louisville, US
• Richard J. Pokorny · Maplewood, US
• Benjamin R. Coonce · South St. Paul, US
• Benjamin G. Sonnek · Mahtomedi, US
• Gregg A. Ambur · River Falls, US
• Jung-Sheng Wu · Woodbury, US

Key dates

• Filing date: Dec 6, 2018
• Grant date: Sep 20, 2022
• Expiry date: Mar 22, 2039

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08K2201/011
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A curable composition comprises: a) 91 to 98.2 weight percent of: (i) at least one polymerizable compound containing at least one carbamylene group; or (ii) at least one polyurethane precursor system; and b) 0.2 to 9 weight percent of alpha alumina particles having a particle size distribution with a Dv50 of from 0.1 to 1 micron, wherein the weight percentages of a) and b) are based upon the total amount of a) and b). Cured compositions and their use in thermoforming are also disclosed.