Acylated Starch Derivatives for Coating Adhesion

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Solution Overview

Problem

Existing coating compositions lack enhanced adhesion on plastics and metal surfaces, as well as improved water resistance and flexibility, which are crucial for industrial applications.

Innovation Solution

The use of starch derivatives that are partially acetylated and partially acylated with at least one fatty acid, with a molecular weight ranging from 3,000 to 50,000 g/mol, as additives in coating compositions to enhance adhesion, water resistance, and flexibility.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If conventional coating compositions are used, then the coating can be applied to surfaces, but adhesion on plastics and metal surfaces is insufficient

Engineering Contradiction:
ImproveadhesionVSAvoidcoating performance
Core Design Contradiction:
StrengthVSReliability

Solution Approach 1:

The patent modifies the chemical structure of starch by controlling the degree of substitution (DS) of acetyl and fatty acid groups, and adjusting molecular weight (3,000-50,000 g/mol) to optimize adhesion properties on plastic and metal surfaces while maintaining coating reliability

Inventive Principle:
Principle #35Parameter changes

Solution Approach 2:

The invention creates a composite starch derivative structure combining acetyl groups and fatty acid chains grafted on starch backbone, where the hydrophobic fatty acid components enhance adhesion to non-polar plastic surfaces while the starch backbone maintains water resistance and flexibility

Inventive Principle:
Principle #40Composite materials

2Stability of the object's composition

If coating compositions are made more flexible, then flexibility improves, but water resistance may deteriorate

Engineering Contradiction:
ImproveflexibilityVSAvoidwater resistance
Core Design Contradiction:
Stability of the object's compositionVSObject-affected harmful factors

Solution Approach 1:

The patent introduces different functional groups at different locations in the starch molecule: hydrophobic fatty acid chains provide water resistance at the surface interface, while the flexible starch backbone and acetyl groups provide flexibility in the bulk coating material

Inventive Principle:
Principle #3Local quality

Solution Approach 2:

The dual-modified starch structure copies the beneficial properties of both traditional flexible polymers and water-resistant coatings, achieving both flexibility and water resistance simultaneously through the synergistic combination of starch, acetyl, and fatty acid components

Inventive Principle:
Principle #26Copying

3Strength

If starch derivatives are highly substituted to improve adhesion, then adhesion improves, but solubility and processability may worsen

Engineering Contradiction:
ImproveadhesionVSAvoidsolubility
Core Design Contradiction:
StrengthVSEase of manufacture

Solution Approach 1:

The patent applies partial substitution with controlled degree of substitution values (DS acetyl: 0.1-2.0, DS fatty acid: 0.1-1.0) rather than complete substitution, achieving sufficient adhesion improvement while maintaining adequate solubility in common solvents for ease of manufacturing and coating application

Inventive Principle:
Principle #16Partial or excessive action

Data Source

PatentEP3589664B1Acylated starch derivatives and use thereof
Publication Date: 2025.05.21 CERDIA INT GMBH

AI summary

The present invention concerns the use of starch derivatives, wherein the starch derivative is partially acetylated and partially acylated with at least one fatty acid, as additive in coating compositions, and starch derivatives which are partially acetylated and partially acylated with at least one fatty acid at least one fatty acid, wherein the MW of the starch derivatives is from 3.000 to 50.000 g/mol.