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:
Apr. 05, 2016
Filed:
Apr. 20, 2010
Herve Adam, Clarksburg, NJ (US);
Arnaud Cadix, Saint-Ouen, FR;
Chi-thanh Vuong, Lognes, FR;
RHODIA OPERATIONS, Paris, FR;
Abstract
A process for the preparation of an elastomer capable of swelling in oil and/or in water and brine comprising the steps of: a) making an aqueous inverse emulsion of particles of a polymer comprising a betaine group prepared by inverse emulsion polymerization of monomers Acomprising a betaine group, optionally other monomers Band a small quantity of polyvalent, preferably divalent or trivalent monomers C, comprised in an aqueous phase dispersed in the form of droplets in a hydrophobic external phase having hydrophobic surfactants, the molar ratio of the monomers Ato the optional monomers Bbeing between 4/96 and 40/60, preferably 7/93 and 30/70, the molar ratio of the polyvalent, preferably divalent or trivalent monomers Cper mole of polymer being between 1.5 and 10, preferably between 2 and 4, and b) compounding said elastomer with the aqueous inverse emulsion obtained by step a).