Poly(imide-ester-amide) Copolymer Optical Film Hardness Flexibility

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Solution Overview

Problem

Thin films made from polyimide and polyamide-polyimine copolymers face issues with insufficient hardness and poor flexibility, affecting their performance and durability.

Innovation Solution

A poly(imide-ester-amide) copolymer with a specific molar ratio of imide, ester, and amide bonds (40:10:30 to 80:15:26) is developed, incorporating aromatic diamine and tetracarboxylic dianhydride monomers with ester groups, and aromatic dicarboxylic acid dichloride monomers, to form an optical film with improved flexibility, transparency, and hardness.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If polyimide is used as the thin film material, then heat resistance and mechanical properties are improved, but hardness is insufficient leading to surface damage

Engineering Contradiction:

Improveheat resistanceVSAvoidsurface scratching and breakage

Core Design Contradiction:

StrengthVSObject-affected harmful factors

Solution Approach 1:

The patent creates a poly(imide-ester-amide) copolymer that combines imide bonds (providing heat resistance) with ester bonds and amide bonds (improving hardness). This composite molecular structure integrates multiple functional units to simultaneously achieve thermal stability and enhanced surface hardness, resolving the contradiction between heat resistance and surface durability.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent modifies the molecular structure parameters by controlling the molar ratio of different bonds (imide:ester:amide = 40-80:10-30:5-30) to optimize both heat resistance and hardness. By adjusting these compositional parameters, the material achieves improved surface hardness while maintaining the heat resistance characteristics of polyimide.

Inventive Principle:

Principle #35Parameter changes

2Ease of operation

If polyamide-polyimine copolymer is used to form thin film, then flexibility is improved, but transparency and hardness are insufficient

Engineering Contradiction:

ImproveflexibilityVSAvoidpoor transparency and hardness

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The patent develops a copolymer containing imide bonds (for transparency and heat resistance), ester bonds (for flexibility), and amide bonds (for hardness). This multi-component composite structure at the molecular level simultaneously provides flexibility, transparency, and hardness, overcoming the limitations of previous single-function copolymers.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent assigns different functional roles to different bond types within the copolymer chain: imide bonds provide transparency and thermal stability, ester bonds provide flexibility, and amide bonds provide hardness. This local functional differentiation within the molecular structure allows the material to exhibit multiple desirable properties simultaneously.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS11912827B2Poly(imide-ester-amide) copolymer and optical film

Publication Date: 2024.02.27 DAXIN MATERIALS

AI summary

A poly(imide-ester-amide) copolymer and an optical film are provided. The poly(imide-ester-amide) copolymer includes imide bonds, ester bonds, and amide bonds. A molar ratio of the imide bonds, the ester bonds, and the amide bonds is 40 to 80:10 to 30:5 to 30. The imide bonds are derived from an aromatic diamine monomer and a tetracarboxylic dianhydride monomer. The amide bonds are derived from an aromatic dicarboxylic acid dichloride monomer and an aromatic diamine monomer or is derived from the aromatic dicarboxylic acid dichloride monomer and an alkoxysilane containing an amine group or an isocyanate group.