Thermal Crosslinked Polyester with Carboxy-Reactive Additives

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Solution Overview

Problem

Current methods for crosslinking polyesters, such as irradiation and chemical crosslinking using multifunctional acrylates or epoxies, are costly, difficult to control, and can be affected by additives like dyes and pigments, leading to inconsistent results and unwanted side effects during processing.

Innovation Solution

Thermal crosslinking of polyesters with carboxy-reactive materials, specifically using compounds with epoxy groups and silane groups, to create a stable and adaptable crosslinked polyester composition that can encapsulate visual effect additives for decorative or security applications.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If irradiation crosslinking is used to alter polyester properties, then thermal resistance and mechanical strength are improved, but cost increases and the process is affected by additives such as dyes, pigments, and antioxidants

Engineering Contradiction:

Improvemechanical strengthVSAvoidinterference with additives

Core Design Contradiction:

StrengthVSObject-affected harmful factors

Solution Approach 1:

The patent replaces irradiation (electromagnetic radiation) with thermal crosslinking using heat and a carboxy-reactive material. This substitution eliminates the interference with additives that occurs during irradiation, as the thermal process does not have the same interactive effects with dyes, pigments, and antioxidants. The crosslinking is achieved through chemical reaction between the polyester carboxyl groups and the carboxy-reactive material under thermal conditions.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the crosslinking mechanism from irradiation-based to thermal-based. By controlling temperature parameters and using a specific carboxy-reactive material, the process achieves crosslinking without the harmful interactions that occur during irradiation. The thermal process allows for controlled crosslinking that is not affected by the presence of common polyester additives.

Inventive Principle:

Principle #35Parameter changes

2Temperature

If chemical crosslinking using multifunctional acrylate or epoxy resin is used, then thermal resistance is improved, but the process becomes heat sensitive and difficult to control, leading to inconsistent results

Engineering Contradiction:

Improvethermal resistanceVSAvoidconsistency of crosslinking

Core Design Contradiction:

TemperatureVSManufacturing precision

Solution Approach 1:

The patent introduces a carboxy-reactive material as an intermediary substance that mediates the crosslinking process. This material reacts specifically with the carboxyl groups in the polyester under thermal conditions, providing a controlled and consistent crosslinking mechanism. The intermediary approach replaces the direct and uncontrollable heat-sensitive chemical crosslinking with a more predictable reaction pathway that yields consistent results.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Strength

If conventional crosslinking methods are used to adjust polyester properties, then thermal and mechanical properties are improved, but the methods are costly and not readily adaptable to large scale manufacture

Engineering Contradiction:

Improvemechanical strengthVSAvoidscalability

Core Design Contradiction:

StrengthVSEase of manufacture

Solution Approach 1:

The patent employs a self-service crosslinking approach where the polyester itself, through its carboxyl groups, participates in the crosslinking reaction with the carboxy-reactive material. This eliminates the need for complex external crosslinking systems or expensive equipment, making the process simple and easily scalable to large production volumes. The crosslinking occurs directly in the polyester matrix during processing.

Inventive Principle:

Principle #25Self-service

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 method provides a predictable and scalable way to adjust the properties of polyesters, enhancing thermal resistance, mechanical strength, and optical properties, while allowing for the creation of decorative patterns or security features in polyester-based compositions.

Implementation Method 1

thermally crosslinked reaction product of a polyester and a carboxy-reactive material

Methodology Applied

Scientific EffectThermal crosslinking:

Implementation Method 2

crosslinking of polyesters with carboxy-reactive materials, specifically using compounds with epoxy groups and silane groups

Methodology Applied

Scientific EffectChemical Bonding: Chemical Bonding

Implementation Method 3

allowing for the creation of decorative patterns or security features in polyester-based compositions

Methodology Applied

Scientific EffectEncapsulation:

Data Source

PatentUS8114515B2Crosslinked polyester compositions, method of manufacture, and uses thereof

Publication Date: 2012.02.14 SABIC GLOBAL TECHNOLOGIES BV

AI summary

A composition comprises a thermally crosslinked reaction product of a polyester and a carboxy-reactive material. Methods for the manufacture of the composition and articles derived from the composition are also disclosed.