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Title: Aquatic herbicides
Claims: Having thus described our invention, we claim: 1. A process for improving the activity of aquatic herbicides which comprises applying these herbicides under water to the vegetation to be controlled in the presence of: A. from 0.005 to 0.2 pounds of a water soluble vinyl addition polymer per gallon of herbicidal solution applied, said water soluble vinyl addition polymer being selected from the group consisting of acrylamide-acrylic acid copolymers, acrylamide-methacrylic acid copolymers, polyacrylic acid, and polymethacrylic acid, said polymer further characterized as having a molecular weight of at least 10,000; and B. from 0.01-5% by weight of the polymer of an inorganic cross-linking agent from the group consisting of water-soluble trivalent salts of aluminum. 2. The process of claim 1 wherein the water soluble vinyl addition polymer is sodium polyacrylate. 3. The process of claim 1 wherein the inorganic crosslinking agent is selected from the group consisting of sodium aluminate and aluminum chloride. 4. The process of claim 1 wherein the vegetation is Hydrilla. 5. The process of claim 1 wherein the water soluble vinyl addition polymer is contained in a water-in-oil emulsion which can be inverted to cause the solubilization of the polymer when contacted with water. 6. The process of claim 1 wherein the water-soluble vinyl addition polymer is a copolymer of acrylamide and acrylic acid. 7. The process of claim 1 wherein the water-soluble polymer has a molecular weight of at least 1 million. Other info: Inventors: Vartiak, Joseph F. (Naperville, IL, US) Wortley, Jr., George E. (Longwood, FL, US) Application Number: 825796 Filing Date: 1977-08-18 Publication_date: 1978-10-31 Assignee: Nalco Chemical Company (Oak Brook, IL) Primary Class(es): 504/152 504/154, 504/361 Other Classes: US Patent Ref:
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