Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Reexamination Certificate
2011-08-23
2011-08-23
Eashoo, Mark (Department: 1767)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
C526S263000, C526S264000, C524S700000
Reexamination Certificate
active
08003738
ABSTRACT:
The present invention relates to a method of producing aqueous secondary dispersions of water-insoluble copolymers by free-radical solution polymerization of ethylenically unsaturated monomers M comprising:i) at least one hydrophobic, monoethylenically unsaturated monomer M1 with a solubility in water of not more than 30 g/l at 25° C. and 1 bar andii) at least one hydrophilic, monoethylenically unsaturated, nonionic comonomer M2 with a solubility in water of at least 80 g/l at 25° C. and 1 bar,in an organic, water-miscible solvent or a mixture of water with an organic, water-miscible solvent as polymerization medium and subsequent replacement of the organic solvent by water in which, toward the end of the polymerization, some of the monomers M are added in the form of a monomer composition M′ which comprises essentially only monomers M2 as monomers. The present invention also relates to the aqueous polymer dispersions obtainable by the method according to the invention and to their use, particularly in pharmacy and cosmetics.
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Bouillo Nathalie
Röβler Gerhard
BASF SE
Connolly Bove & Lodge & Hutz LLP
Eashoo Mark
Salvitti Michael A
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