Lignosulfonate-Mediated Metal Phosphite Composition Stability

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Solution Overview

Problem

The formation of copper or metal phosphite precipitates in aqueous solvents during the application of plant protection agents and fertilizers limits their efficacy and homogeneity, as these precipitates are insoluble and mobile, leading to reduced protective power and environmental concerns.

Innovation Solution

An aqueous composition comprising a metal compound, lignosulfonate, and phosphorous acid or its salts, maintained at a pH of 4.5 to 6, which prevents the formation of metal phosphite precipitates, ensuring the active ingredients remain dissolved and immobile, thereby enhancing application homogeneity and reducing the need for excessive chemical input.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If metal compounds and phosphorous acid are applied in aqueous solvents, then the active ingredients are readily dissolved and distributed homogeneously, but metal phosphite precipitates form reducing efficacy and protective power

Engineering Contradiction:

Improvehomogeneity of active ingredient distributionVSAvoidprotective power of pesticide

Core Design Contradiction:

Stability of the object's compositionVSReliability

Solution Approach 1:

The patent introduces lignosulfonate as an intermediary substance that mediates between metal ions and phosphite ions. The lignosulfonate forms stable complexes with metal ions, preventing them from reacting with phosphite ions to form precipitates, thus maintaining solution homogeneity while preserving biocidal efficacy.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent optimizes the pH parameter of the aqueous solution to maintain metal-phosphite complexes in a soluble state. By controlling pH levels and using lignosulfonate, the chemical parameters are adjusted to prevent precipitation while ensuring the active ingredients remain effective against pathogens.

Inventive Principle:

Principle #35Parameter changes

2Stability of the object's composition

If highly soluble metal compounds are used, then homogeneous covering is achieved, but the active ingredients are transported away from the site of application reducing protective power

Engineering Contradiction:

Improvehomogeneity of active ingredient distributionVSAvoidloss of active ingredient from application site

Core Design Contradiction:

Stability of the object's compositionVSObject-affected harmful factors

Solution Approach 1:

Lignosulfonate acts as a mediator that binds to metal ions to form complexes with controlled solubility and mobility. These complexes remain sufficiently soluble for homogeneous application but have reduced mobility to prevent excessive transport away from the treatment site, thus balancing distribution homogeneity with site retention.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Quantity of substance

If insoluble copper compounds are used, then reduced chemical input is achieved, but homogeneous application is hampered substantially reducing efficacy

Engineering Contradiction:

Improveinput of metal compoundVSAvoidhomogeneity of active ingredient distribution

Core Design Contradiction:

Quantity of substanceVSStability of the object's composition

Solution Approach 1:

The patent changes the physical-chemical parameters of metal compounds by using lignosulfonate complexes. This allows the use of lower quantities of metal compounds while maintaining them in a soluble, homogeneous state during application, thus reducing chemical input without sacrificing application homogeneity or biocidal efficacy.

Inventive Principle:

Principle #35Parameter changes

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The composition ensures long-term immobility of active ingredients, improving the homogeneous application and efficacy of metal ions without increasing the chemical input, thus addressing the challenges of precipitation and environmental impact.

Implementation Method 1

the formation of copper or metal phosphite precipitates from phosphorous acid, and/or a salt and/or a hydrate and/or an ester thereof and metal salts that are dissolved in aqueous solvents

Methodology Applied

Scientific EffectComplexation:

Implementation Method 2

an aqueous composition comprising a metal compound, a lignosulfonate and phosphorous acid and/or a salt and/or a hydrate and/or an ester thereof

Methodology Applied

Scientific EffectAdsorption: Adsorption

Data Source

PatentEP2240015B1Compositions for the control of plant pathogens and for use as plant fertilizer

Publication Date: 2017.08.09 CERADIS

AI summary

The present invention relates to a composition comprising a metal compound, a lignosulfonate and phosphorous acid and/or a salt and/or a hydrate and/or an ester thereof and its use as fungicide, bactericide or fertilizer and its use in preventing the formation of a metal phosphite precipitate in an aqueous composition. The composition is preferably an aqueous composition comprising 0.1 wt.% to 40 wt.% of dry matter, calculated on the total weight of the aqueous composition. The present invention also relatesto a process for preparing the aqueous composition.