Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Reexamination Certificate
2002-12-10
2009-08-25
Jagannathan, Vasu (Department: 1796)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
C524S080000, C524S514000, C524S556000
Reexamination Certificate
active
07579400
ABSTRACT:
The invention relates to particles comprising: at least one ionically-charged water-soluble polymer; at least one surfactant having an ionic charge opposite to that of said polymer; and at least one water-soluble block copolymer having at least one non-ionic hydrophilic block and at least one non-ionic hydrophobic or ionic block. The invention also relates to a method of obtaining such particles consisting in: preparing a first aqueous mixture comprising the water-soluble, ionically-charged polymer and, if necessary, the water-soluble block copolymer if said copolymer has the same charge; subsequently, a second mixture is added to the above mixture, said second mixture comprising the surfactant and, if necessary, the water-soluble block copolymer if said copolymer has the same charge as the surfactant or if it is not ionically charged. Furthermore, the invention relates to the use of water-soluble block copolymers as an agent for stabilizing particles with a mesophase-forming internal structure, the internal structure of the resulting particles forming the same mesophase.
REFERENCES:
patent: 5720964 (1998-02-01), Murray
patent: 6008184 (1999-12-01), Pluyter et al.
patent: 6663855 (2003-12-01), Frechet et al.
patent: 6933340 (2005-08-01), Herve et al.
patent: 7056532 (2006-06-01), Kabanov et al.
patent: 7176170 (2007-02-01), Dubief et al.
Bavouzet Bruno
Beyermann Jochen
Herve Pascal
Hunton & Williams LLP
Jagannathan Vasu
Reddy Karuna P
Rhodia Chimie
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