Dilatant behavior of interpolymer complexes in aqueous solution
AssigneeExxon Research & Engineering Co.
InventorsRobert D. Lundberg, Dennis G. Peiffer, Ilan Duvdevani
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Abstract
The present invention relates to aqueous solutions having dilatant properties in which the aqueous solution contains a polymer complex which is a water soluble polymer backbone containing an anionic comonomer and a copolymer of a water soluble polymer backbone containing a cationic comonomer.
Claims6
A polymer complex in water which comprises the complexation in said water of:
- (a) a copolymer of a first water soluble polymer backbone and an anionic comonomer, said anionic comonomer is selected from the group consisting of styrene sulfonate, vinyl sulfonate, allyl sulfonate, acrylate and acrylamido-propyl sulfonate/2-acrylamido-2-methylpropane sulfonic acid, sodium styrene sulfonate, (meth)acrylic acid and 2-sulfoethylmethacrylate;
- and
- (b) a copolymer of a second water soluble polymer backbone and a cationic comonomer, wherein said cationic comonomer is selected from the group consisting of N,N,N-trimethylammoniumpropylmethacrylamide, vinyl pyridine/methacrylamidopropyltrimethylammonium chloride, dimethyldiallylammoniun chloride, diethyldiallylammonium chloride, 2-methacryloxy-2-ethyltrimethylammonium chloride, trimethylmethacryloxyethylammonium methsulfate, 2-acrylamido-2-methylpropyltrimethylammonium chloride and vinylbenzyltrimethylammonium chloride;
- wherein said first and said second nonionic water soluble polymer backbones are selected from the group consisting of acrylamide, vinyl pyrolidone, ethylene oxide, vinyl alcohol methacrylamide, alkyl substituted acrylamides, n-vinyllactones, methacrylates and N,N-dimethylacrylamide, wherein the molar ratio of the cationic comonomer in the first polymer to the anionic monomer in the second polymer is 20/1 to 1.1/1 or 0.9/1 to 1/20.
A process for increasing the viscosity of water under increasing shear rates which comprises the step of adding to said water about 0.01 to about 10 grams of a polymer complex per 100 ml of said water, said polymer complex comprising:
- (a) a copolymer of a first water soluble polymer backbone and an anionic comonomer, said anionic comonomer is selected from the group consisting of styrene sulfonate, vinyl sulfonate, allyl sulfonate, acrylate and acrylamido-propyl sulfonate/2-acrylamido-2-methylpropane sulfonic acid, sodium styrene sulfonate, (meth)acrylic acid and 2-sulfoethylmethacrylate;
- and
- (b) a copolymer of a second water soluble polymer backbone and a cationic comonomer, wherein said cationic comonomer is selected from the group consisting of N,N,N-trimethylammoniumpropylmethacrylamide, vinyl pyridine/methacrylamidopropyltrimethylammonium chloride, dimethyldiallylammonium chloride, diethyldiallylammonium chloride, 2-methacryloxy-2-ethyltrimethylammonium chloride, trimethylmethacryloxyethylammonium methsulfate, 2-acrylamido-2-methylpropyltrimethylammonium chloride and vinylbenzyltrimethylammonium chloride;
- wherein said first and said second nonionic water soluble polymer backbones are selected from the group consisting of acrylamide, vinyl pyrolidone, ethylene oxide, vinyl alcohol methacrylamide, alkyl substituted acrylamides, n-vinyllactones, methacrylates and N,N-dimethylacrylamide, wherein the molar ratio of the cationic comonomer in the first polymer to the anionic monomer in the second polymer is 20/1 to 1.1/1 or 0.9/1 to 1/20.
Dependencies are inferred from the claim text.