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:
Oct. 13, 2015
Filed:
Mar. 01, 2012
Severine Cauvin, Mons, BE;
Sophie Hanssens, Chastre, BE;
Alberto Petrosino, Manage, BE;
Benoit Rassart, La Louviere, BE;
Blondine Van Roy, Wezembeek-Oppem, BE;
Severine Cauvin, Mons, BE;
Sophie Hanssens, Chastre, BE;
Alberto Petrosino, Manage, BE;
Benoit Rassart, La Louviere, BE;
Blondine Van Roy, Wezembeek-Oppem, BE;
Dow Corning Corporation, Midland, MI (US);
Abstract
The invention relates to a method for the production of silicone in water emulsions by emulsion polymerization. The emulsion contains particles of an organopolysiloxane polymer having an average particle diameter of less than 1 μm. The method comprises: —combining a silanol end-blocked organosiloxane starting polymer, water, and a surfactant; said starting polymer having a viscosity of at least 2 Pa·s preferably at least 2.5 Pa·s preferably at least 3.5 Pa·s preferably at least 4 Pa·s and up to 150 Pa·s; —emulsifying the starting polymer by agitating or shearing the ingredients; —polymerizing the starting polymer to form a longer chain silanol end-blocked organopolysiloxane polymer; wherein at least a portion of said polymerizing step is performed at a temperature of less than or equal to 16° C. preferably less than or equal to 15° C.