Siloxane-Modified Polyester Resin for Flexible Heat-Resistant Films

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Solution Overview

Problem

Existing siloxane-modified polyimide resins do not provide sufficient flexibility for flexible devices, particularly in medical applications, despite their excellent heat resistance.

Innovation Solution

A siloxane-modified polyester resin with carboxyl and (meth)acryloyl groups in the side chain, formulated to achieve a weight average molecular weight of 3000 to 500,000, which is thermally cured to produce a film with enhanced flexibility and heat resistance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Temperature

If siloxane-modified polyimide resin is used, then heat resistance is improved, but flexibility is insufficient

Engineering Contradiction:

Improveheat resistanceVSAvoidflexibility

Core Design Contradiction:

TemperatureVSEase of operation

Solution Approach 1:

The invention changes the chemical structure parameters of the resin by introducing carboxyl groups and (meth)acryloyl groups in the side chains, and controlling the weight average molecular weight to 3000-500,000. This allows the cured product to achieve both heat resistance (Tg≥100°C) and flexibility (elongation at break ≥5%), resolving the contradiction between heat resistance and flexibility.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention creates a composite cured product by combining siloxane-modified polyester resin with specific functional groups (carboxyl and (meth)acryloyl groups) and curing agents. This composite structure provides both the heat resistance from the siloxane backbone and the flexibility from the polyester chain structure and functional groups.

Inventive Principle:

Principle #40Composite materials

2Adaptability or versatility

If flexibility is improved for flexible devices, then adaptability is improved, but heat resistance may be compromised

Engineering Contradiction:

Improveflexibility for flexible devicesVSAvoidheat resistance

Core Design Contradiction:

Adaptability or versatilityVSTemperature

Solution Approach 1:

The invention optimizes the molecular weight parameter (3000-500,000) and introduces specific functional groups to achieve the right balance between flexibility and heat resistance, enabling the cured product to meet both requirements for flexible devices.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention introduces carboxyl groups and (meth)acryloyl groups specifically in the side chains of the polyester backbone, creating local regions with different properties that contribute to both flexibility and heat resistance in different parts of the polymer structure.

Inventive Principle:

Principle #3Local quality

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 resulting cured product exhibits both high heat resistance and flexibility, making it suitable for applications requiring flexibility and durability.

Implementation Method 1

A cured product obtained by thermally curing the siloxane-modified polyester resin

Methodology Applied

Scientific EffectThermal curing: Phase Change

Data Source

PatentUS20250313664A1Siloxane-modified polyester resin and cured product thereof

Publication Date: 2025.10.09 SHIN ETSU CHEMICAL CO LTD

AI summary

A siloxane-modified polyester resin having a carboxyl group and a (meth)acryloyl group in a side chain thereof. The siloxane-modified polyester resin is capable of imparting sufficient flexibility to a cured product thereof in addition to heat resistance. The siloxane-modified polyester resin having the carboxyl group and the (meth)acryloyl group in a side chain thereof can provide a cured product having high heat resistance and flexibility.