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Use of reactive polymeric surfactants in formation of emulsions

A polymer and emulsion technology, applied in animal repellents, plant growth regulators, applications, etc., can solve the problems of capsule processing and adverse effects on performance, environmental pollution, etc.

Inactive Publication Date: 2004-10-27
SYNGENTA LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Preparation of certain formulations, such as microcapsules produced by interfacial polymerization, requires high levels of surfactants, which can adversely affect capsule processing and performance
Moreover, high levels of "free" surfactant are washed out of the aqueous phase, thereby creating undesirable environmental pollution problems

Method used

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  • Use of reactive polymeric surfactants in formation of emulsions
  • Use of reactive polymeric surfactants in formation of emulsions
  • Use of reactive polymeric surfactants in formation of emulsions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0197] Synthesis of living polymer surfactants by atom transfer radical polymerization (ATRP).

[0198] General synthesis steps:

[0199] In a typical polymerization reaction, the monomers in the desired molar ratio are dissolved in a suitable solvent or solvent mixture. When all the components in the reaction are soluble in toluene, toluene is generally used. Some components such as AEMA·HCl, QuatDMAEMA, SSA, DMMAPSA betaine and DMMAEA betaine have poor solubility in organic solvents, so use methanol-water mixtures for their mixture (volume ratio 1:1~3:1) .

[0200] Add the appropriate initiator. In order to prepare non-ionic block copolymers, it is a polymer macroinitiator, such as mono-2-bromoisobutyryl monomethoxy poly(ethylene glycol), abbreviated as PEG-Br(#), where # Is the number of ethylene glycol units, which is prepared by literature methods (Jankova et al., Macromolecules, 1998, 31, 538-541). In order to prepare graft copolymers or ionic block copolymers, the initiator...

Embodiment 5a-6l

[0219] The function of the following examples is to illustrate that the active polymer surfactant of the present invention can utilize isocyanate and carbodiimide to crosslink at the oil / water interface to prepare a stable emulsion.

Embodiment 5a-5k

[0220] Examples 5a-5k. Isocyanate method.

[0221] A reactive polymer surfactant containing amino groups is used to emulsify a water-immiscible phase containing a small amount of hydrophobic polyfunctional isocyanate, such as PMPPI or HDIT. If necessary, adjust the pH of the emulsion to 7-9, and then stir at 20-50°C for 1-24h for cross-linking.

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PUM

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Abstract

Reactive polymeric surfactants are disclosed, and their use in processes for preparation of microcapsules, and in stabilising emulsions. The surfactants are random graft polymers or block copolymers which contain both hydrophobic and hydrophilic units and in which the hydrophobic unit includes a hydrophilic cross-linking unit which reacts with (a) a wall forming ingredient in a microencapsulation process, or (b) an ingredient in the disperse phase of an emulsion.

Description

Background of the invention [0001] The present invention relates to the use of active polymer surfactants in the formation of emulsions, and further relates to the use of active polymer surfactants in the formation of emulsions used in preparing microencapsulated products. [0002] The active polymer surfactants used in the present invention (also referred to herein as polymer stabilizers) generally contain three parts-a hydrophilic part, a hydrophobic part, and relative to monomer or prepolymer material, or relative to emulsion The selected components in the dispersed phase have reactivity or crosslinking ability. When these surfactants are used together with the discontinuous phase dispersed in the continuous phase mainly containing water, the hydrophobic part is strongly adsorbed on the surface of the discontinuous phase, while the hydrophilic part strongly associates with the water phase. Cooperatively, thereby imparting colloidal stability to the discontinuous phase. The cros...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K23/52A01N25/28A01N37/22A01N53/06A01N53/08B01J13/00B01J13/14B01J13/16C08L101/00C09K23/00C09K23/54C09K23/56
CPCB01F17/0028B01F17/005Y10S524/916B01F17/0057B01F17/0071B01F17/0064B01J13/16Y10T428/2985C09K23/00C09K23/54C09K23/16C09K23/14
Inventor A·M·赫明P·J·穆尔奎恩H·B·舍尔I·M·雪莉
Owner SYNGENTA LTD
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