Appeal No. 1996-2115
Application 08/809,933
polymeric microparticles. Claim 1 is directed to polymeric microparticles which are
anionic or cationic and claim 23 is directed to polymeric microparticles which are non-
ionic.
Claims 1, 4-5, 8, 10, 13, 23, 26-27 and 29 read as follows:
1. Highly branched, water-soluble, high molecular weight cationic or anionic
polymeric microparticles wherein said microparticles have an average unswollen diameter
of less than about 0.1 micron, a solution viscosity of at least about 2.0 mPa.s and having a
methylenebisacrylamide content of from 2 to 80 molar parts per million based on the
monomeric units present in the polymer, said microparticles having a solubility quotient
greater than about 30 percent, said polymer being comprised of an acrylamide and a
comonomer selected from the group consisting of diallyldimethylammonium chloride;
acryloxyethyltrimethylammonium chloride; quaternaries of N,N-
dialkylaminoalkyl(meth)acrylamides; (meth)acrylamidopropyltrimethylammonium chloride;
(meth)acrylic acid, [sic] styrene sulfonic acid; itaconic acid; 2-acrylamido-2-
methylpropanesulfonic acid; sulfoalkyl(meth)acrylic acid; salts of the above acids and
sulfomethylated(methyl)acrylamides.
4. Polymeric microparticles as defined in Claim 1 wherein said solution viscosity is
at least about 2.2 mPa.s.
5. Polymeric microparticles as defined in Claim 1 wherein said solution viscosity is
at least about 2.4 mPa.s.
8. Polymeric microparticles as defined in Claim 1 wherein said comonomer
consists of acryloxyethyltrimethylammonium chloride.
10. Polymeric microparticles as defined in Claim 1 wherein said comonomer
consists of salt of acrylic acid.
13. Cationic polymeric microparticles as defined in Claim 1 wherein said solubility
quotient is greater than about 40 percent.
2
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