Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymerizing in two or more physically distinct zones
Reexamination Certificate
2005-06-03
2009-08-25
Wu, David (Department: 1796)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymerizing in two or more physically distinct zones
C526S328000, C526S329300
Reexamination Certificate
active
07579414
ABSTRACT:
Finely divided, amphoteric, aqueous polymer dispersions which are obtainable by a two-stage polymerization, a prepolymer being prepared in the first polymerization stage from a monomer mixture comprising(a) from 15 to 40% by weight of at least one (meth)acrylate and/or (meth)acrylamide having in each case a free amino group, protonated amino group and/or quaternized amino group,(b) from 40 to 70% by weight of at least one optionally substituted styrene,(c) from 0 to 25% by weight of acrylonitrile and/or methacrylonitrile,(d) from 0.5 to 5% by weight of at least one ethylenically unsaturated monomer comprising acid groups and(e) from 0 to 30% by weight of at least one nonionic, ethylenically unsaturated monomer differing from (b) and (c),the sum of (a)+(b)+(c)+(d)+(e) being 100% by weight,in a solution polymerization in a solvent partly to completely miscible with water, water then being added to the solution/dispersion of the prepolymer and then at least one nonionic, ethylenically unsaturated monomer being subjected to an emulsion polymerization in the aqueous solution of the prepolymer in a second polymerization stage, processes for the preparation of the polymer dispersions by two-stage polymerization and use of the polymer dispersions as sizes for paper, board and cardboard.
REFERENCES:
patent: 4051093 (1977-09-01), Wendel et al.
patent: 4434269 (1984-02-01), Probst et al.
patent: 4659431 (1987-04-01), Probst et al.
patent: 6114417 (2000-09-01), O'Toole et al.
patent: 2002/0040088 (2002-04-01), Hauschel et al.
patent: 2003/0072950 (2003-04-01), Rodrigues et al.
patent: 24 52 585 (1976-05-01), None
patent: 24 54 397 (1976-05-01), None
patent: 0 051 144 (1982-05-01), None
patent: 0 058 313 (1982-08-01), None
patent: 1 180 527 (2002-02-01), None
patent: WO 00/44983 (2000-08-01), None
Polymer Latices: Science and Technology, 2ndedition, D.C. Blackley (Springer 1997).
Dyllick-Brenzinger Rainer
Ettl Roland
Kukula Hildegard
Sturm Bernhard
BASF - Aktiengesellschaft
Nguyen Vu
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Wu David
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