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Particulate suspensions

A technology of suspension and particulate matter, applied in animal repellants, chemical/physical processes, plant growth regulators, etc., can solve problems such as limitations

Inactive Publication Date: 2013-04-17
SYNGENTA LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of an aqueous medium substantially free of miscible organic solvents limits the types of polymeric surfactants that can be used, since highly hydrophobic surfactants will not be sufficiently soluble in aqueous media substantially free of miscible organic solvents middle

Method used

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  • Particulate suspensions
  • Particulate suspensions
  • Particulate suspensions

Examples

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Effect test

Embodiment 31～328

[0204] These examples illustrate the crosslinking of the polymeric stabilizer by reaction with a crosslinking material to form a particulate suspension according to the invention. Use the following procedure:

[0205] Hydroxyl and amine functional polymer stabilizers were crosslinked by either (i) dispensing TDI into the aqueous phase of the SC to allow time for the TDI to adsorb onto the microparticles, followed by heating at 50 °C for 1 h , or stirred at room temperature for 3 hours, or (ii) disperse IPDI in the water phase of the SC, so that the IPDI has a certain time to be adsorbed on the particles, and then add diethylenetriamine (DETA) to react with excess Isocyanate reaction.

[0206] Carboxylic acid functional RPS SC was crosslinked by dispersing CX-100 or CX-300 into the SC at pH ≥ 9 and stirring at room temperature for 30 minutes to achieve adsorption of the crosslinker. The pH was lowered to ~2 and after a further 1 hour of stirring a small amount of EDTA was add...

Embodiment 4

[0213] This example illustrates that the method of the present invention improves the stability of Abamectin particle suspension. A sample of Abamectin SC was prepared with the polymer of Example 1.5, resulting in an uncrosslinked product of Example 2.23. Compare this with the corresponding crosslinked polymer (Example 3.6). The SC samples were treated with various concentrations of Na 2 SO 4 The solution was diluted to study SC stability. Sedimentation at various electrolyte concentrations and at various temperatures was evaluated to determine the stability of the suspension under these conditions. With increasing concentration and temperature, conditions were eventually reached where the suspension was seen to form large flocculations. Crosslinking of the reactive polymeric surfactant with TDI increases the temperature at which coagulation is found to occur for a given electrolyte concentration.

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Abstract

The stability of a particulate suspension comprising an aqueous phase containing substantially no miscible organic solvent having suspended therein an agrochemical solid substantially insoluble in said aqueous phase is enhanced by (i) forming a polymeric stabiliser having a hydrophilic moiety and a hydrophobic moiety by polymerising a plurality of vinylic monomers, not being exclusively vinylic esters or their hydrolysed products, at least some of which contain functional groups capable of undergoing cross-linking reactions and (ii) reacting said polymeric stabiliser with one or more substances contained (dissolved or suspended) in the aqueous phase capable of undergoing a cross-linking reaction with said functional groups, wherein the ratio by weight of (a) the polymeric stabiliser prior to cross-linking to (b) the suspended agrochemical is less than 1 part of polymeric stabiliser per 5 parts of suspended agrochemical.

Description

technical field [0001] The present invention relates to particulate suspensions and in particular to the use of reactive polymeric surfactants for the stabilization of particulate suspensions. Background technique [0002] In US 6262152, a solid particulate dispersion is described comprising (a) a liquid carrier such as water or an organic solvent; (b) particles at least substantially insoluble in the liquid carrier; (c) a polymer dispersed agent, the dispersant has at least one segment soluble in the liquid carrier and at least one segment insoluble in the liquid carrier, the insoluble segment has a crosslinkable segment; and (d) wherein the polymer The crosslinkable segments on the insoluble segment of the polymeric dispersant are so crosslinked that the insoluble segment of the polymeric dispersant forms a crosslinked polymer in which particles are entrapped. It is emphasized that the microparticles are trapped in the network of insoluble polymer segments and cross-links...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A01N25/04A01N25/10A01NA01N25/00C09K23/52
CPCA01N25/04A01N25/10A01N37/34A01N25/30A01N43/40A01N43/54A01N43/90A01N51/00
Inventor A·M·赫明I·M·雪莉P·D·温
Owner SYNGENTA LTD
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