Polysaccharide Trimellitic Anhydride Ester Scale Inhibition

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Solution Overview

Problem

Current biodegradable polysaccharide esters used in fabric and home care formulations lack stability at basic pH and effective inorganic scale inhibition, which is crucial for applications in laundry and dishwashing, and their calcium carbonate inhibition capacity is often inadequate.

Innovation Solution

A carboxylate ester of polysaccharide esterified with trimellitic anhydride, with a degree of substitution between 0.5 and 3, specifically using inulin, maltodextrin, xyloglucan, or starch, which maintains stability and enhances calcium carbonate inhibition capacity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If biodegradable polysaccharide esters are used as alternatives to acrylic acid based dispersants and antiscalants, then environmental friendliness and biodegradability are improved, but hydrolysis stability at basic pH and inorganic scale inhibition capacity deteriorate

Engineering Contradiction:

ImprovebiodegradabilityVSAvoidhydrolysis stability at basic pH

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The patent changes the chemical parameters of the polysaccharide ester by esterifying with trimellitic anhydride instead of other anhydrides, and by controlling the degree of substitution within 0.5-3.0, achieving both biodegradability and hydrolysis stability at basic pH

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention creates a composite structure by combining polysaccharide backbone with trimellitic anhydride ester groups, resulting in a material that exhibits both biodegradability from the polysaccharide component and enhanced stability and scale inhibition from the trimellitic anhydride ester groups

Inventive Principle:

Principle #40Composite materials

2Reliability

Engineering Contradiction:

ImprovebiodegradabilityVSAvoidinorganic scale inhibition capacity

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent changes the chemical composition parameters by selecting trimellitic anhydride as the esterifying agent and controlling the degree of substitution between 0.5-3.0, which provides sufficient calcium carbonate inhibition capacity while maintaining biodegradability

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The composite structure of polysaccharide- trimellitic anhydride ester combines the biodegradability of polysaccharide with the scale inhibition properties of trimellitic anhydride ester groups, achieving both environmental friendliness and effective inorganic scale inhibition

Inventive Principle:

Principle #40Composite materials

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 carboxylate ester of polysaccharide with trimellitic anhydride exhibits improved hydrolysis stability and effective inorganic scale inhibition, maintaining performance even at basic pH levels, making it suitable for laundry and dishwashing applications.

Implementation Method 1

the carboxylate ester of polysaccharide with trimellitic anhydride exhibits improved hydrolysis stability and effective inorganic scale inhibition, maintaining performance even at basic pH levels

Methodology Applied

Scientific EffectHydrolysis resistance: Hydrolysis

Implementation Method 2

these polymers are also used in water-conveying systems as agents for preventing mineral deposits such as e.g. calcium and magnesium sulfate, magnesium hydroxide, calcium and barium sulfate and calcium phosphate on heat transfer surfaces or in pipelines

Methodology Applied

Scientific EffectScale inhibition: Deposition (physical)

Data Source

PatentUS10167347B2Carboxylate ester of polysaccharide

Publication Date: 2019.01.01 BASF SE

AI summary

The invention relates to a carboxylate ester of polysaccharide characterized in that it possesses ester bonds with trimellitic anhydride and is soluble in water. The polysaccharide is esterified with trimellitic anhydride and the degree of substitution of the polysaccharide lies in the range of from 0.5 to 3. The invention further relates to methods for the manufacture of these polysaccharides esters in organic solvents, in water or in an extruder or a kneader and to their use in fabric and home care formulations.