Pesticide or herbicide polymer complexes for forming aqueous dispersions

• US 5,476,662 A
• Filed: 11/13/1992
• Issued: 12/19/1995
• Est. Priority Date: 11/13/1992
• Status: Expired due to Term

• Current Assignee: ISP Capital, Inc. (Ashland Global Holdings, Inc.)
• Original Assignee: ISP Investments, Inc. (Ashland Global Holdings, Inc.)
• Inventors: Narayanan, Kolazi S., Chaudhuri, Ratan K.
• Primary Examiner(s): Page, Thurman K.
• Assistant Examiner(s): LEVY, NEIL S
• Application Number:
  US07/975,812
• Time in Patent Office: 1,131 Days
• Field of Search: 424/405, 424/409, 424/489, 424/78.33, 424/78.35, 424/78.37, 71/85, 71/64.08, 504/116, 504/142, 504/143, 504/149, 504/308, 514/628
• US Class Current: 424/409
• CPC Class Codes: A01N 2300/00 Combinations or mixtures of active ingredients covered by classes A01N27/00 - A01N65/48 with other active or formulation relevant ingredients, e.g. specific carrier materials or surfactants, covered by classes A01N25/00 - A01N65/48
• CPC Class Codes: A01N 25/10 Macromolecular compounds
• CPC Class Codes: A01N 37/22 the nitrogen atom being directly attached to an aromatic ring system, e.g. anilides
• CPC Class Codes: A01N 37/26 containing the group; Thio analogues thereof

Abstract

Various liquid or low melting pesticide and herbicide formulations, previously formulated with organic solvents, are combined with a polymer in solution and co-precipitated to form a polymer complex which captures the pesticide or herbicide yet exists as a solid at ambient conditions. By preparing the pesticide or herbicide formulation as a solid complex, storage and handling of the formulation is possible without the potential for organic solvent emission. When the solid polymer complex is placed in water, a stable aqueous dispersion of the pesticide or herbicide is achieved as the polymer inhibits flocculation, with approximately 100% recovery of the pesticide or herbicide.

Claims

1. A solid complex of a polymer and a pesticide formulation, comprising a polymer having acid groups in a polymer matrix thereof and being capable of forming an insertion complex via hydrogen bonding with the pesticide formulation, the polymer selected from the group consisting of a maleic acid-methylvinylether alternating copolymer, a maleic acid-butylvinylether copolymer, polyacrylic acid, polymethacrylate, and pyrollidonylethyl-maleimide-methylvinylether-maleic acid copolymer, the pesticide being from the group consisting of metolachlor, acetochlor, pretilachlor, dimethachlor, alachlor and butachlor, the solid complex comprising from 10 to 90 percent by-weight pesticide formulation co-precipitated with the polymer.

2. The complex of claim 1 wherein the ratio of pesticide formulation to polymer is from 30-90% pesticide.

3. The complex of claim 1 wherein the ratio of pesticide formulation to polymer is from 40-60% pesticide.