Abstract: A method of making encapsulated chromonic nanoparticles includes exposing crosslinked chromonic nanoparticles to an acid selected from the group consisting of carbonic acid, phosphoric acid, lactic acid, citric acid, boric acid, sulfuric acid, and mixtures thereof in the presence of water to encapsulate the crosslinked nanoparticles in a shell comprising a complex comprising the chromonic material, the multivalent cations, and the acid anions.
Type:
Grant
Filed:
September 30, 2010
Date of Patent:
July 19, 2011
Assignee:
3M Innovative Properites Company
Inventors:
Hassan Sahouani, Sanat Mohanty, Cristin E. Moran
Abstract: The present invention relates to optical elements comprising fluorochemical surface treatments. The invention further relates to materials such as retroreflective sheetings, pavement markings and beaded projection screens comprising a binder and the surface treated optical elements. The fluorochemical surface treatment is substantially free of perfluoroalkyl groups having more than four carbon atoms. Preferably, the surface treatment is a polyfluoropolyether-based compound comprising at least one polar group or polar group-containing organic radical.
Type:
Grant
Filed:
October 24, 2001
Date of Patent:
November 9, 2004
Assignee:
3M Innovative Properites Company
Inventors:
Mark J. Pellerite, Susannah C. Clear, Cheryl L. Elsbernd, Richard M. Flynn, George Van Dyke Tiers, Naiyong Jing