Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Reexamination Certificate
2005-11-09
2009-11-17
Wu, David (Department: 1796)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
C526S220000, C526S320000, C526S329500, C526S329600, C526S333000, C526S307500, C526S317100, C526S318000, C524S005000, C524S558000, C524S556000, C524S560000
Reexamination Certificate
active
07619045
ABSTRACT:
The present invention relates to a process for the preparation in aqueous solution of water-soluble acrylic polymers or for the preparation in aqueous dispersion of water-dispersible acrylic co-polymers, polymerised from, the total being 100 mol %:a) 5 to 70 mol % of one or more monomer(s) (A) which are (alkoxy)polyalkylene glycol (meth)acrylates and/or ((alkoxy)polyalkylene glycol)(meth)acrylamides;b) 5 to 95 mol % of one or more unsaturated carboxylic monomer(s) (B); andc) 0 to 85 mol % of one or more hydrophobic monomer(s) (C) which are water insoluble, in the absence of a chain-transfer agent, and in the presence of a sufficient amount of a water-soluble alkoxyamine, until a conversion of at least 90% by weight of the monomers (A), (B) and (C) is obtained. The polymer has a polydispersity indexMw/Mnadvantageously <2 and anMnof between 10 000 g/mol and 50 000 g/mol. Alternately, only some of the monomer (>50%) is converted by the alkoxyamine and the polymerization is completed by a conventional radical initiator. The polymer obtained has a polydispersity indexMw/Mn<6, advantageously <5, preferably <4, and anMwof between 10 000 g/mol and 500 000 g/mol and advantageously between 30 000 and 150 000 g/mol.
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http://www.galleries.com/minerals/sulfates/ gypsum/gypsum.htm.
http://www.ingentaconnect.com/content/k1u/glac/2003/00000060/F0020011/00487272.
Guerret Olivier
Hidalgo Manuel
Magnet Stephanie
Arkema France
Nguyen Vu
Roland Thomas F.
Wu David
LandOfFree
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