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:
Aug. 29, 2017
Filed:
Dec. 16, 2011
Stephanie Magnet, Morlanne, FR;
Raber Inoubli, Pau, FR;
Laurence Couvreur, Paris, FR;
Bernadette Charleux, Lyons, FR;
Segolene Brusseau, Cachan, FR;
Stephanie Magnet, Morlanne, FR;
Raber Inoubli, Pau, FR;
Laurence Couvreur, Paris, FR;
Bernadette Charleux, Lyons, FR;
Segolene Brusseau, Cachan, FR;
ARKEMA FRANCE, Colombes, FR;
CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE, Paris, FR;
UNIVERSITE PIERRE ET MARIE CURIE, Paris, FR;
Abstract
The invention relates to polymer particles in the form of filaments formed by block copolymers, as well as to the method for preparing same by means of controlled radical polymerization in emulsion in the presence of a specific living macroinitiator derived from a nitroxide. The invention is characterized in that the filamentous particles are obtained in a dispersed aqueous medium by means of the synthesis of said block copolymers, performed by heating the reaction medium at a temperature of 60 to 120° C., the final block copolymer containing between 10 and 50 mol. % of the macroinitiator which is water soluble and the hydrophobic monomer conversion rate being at least 50%. According to the invention, the weight ratio of hydrophilic fraction of the filamentous particles is less than 25 wt %.