Fumaric Diester Copolymer for Optical Films
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Solution Overview
Problem
Current fumaric diester-based materials lack a copolymer composition that simultaneously achieves excellent heat resistance and transparency, particularly in optical applications, as existing homopolymers and copolymers do not incorporate specific (meth)acrylic ester units with oxetanyl and tetrahydrofurfuryl groups.
Innovation Solution
A novel fumaric diester copolymer is developed, comprising a fumaric diester residue unit and at least one (meth)acrylic ester unit with an oxetanyl group and/or a tetrahydrofurfuryl group, which is crosslinked to form films with enhanced heat resistance and transparency, suitable for optical applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If homopolymer or copolymer is obtained from fumaric diester, then heat resistance is improved, but transparency and optical properties are insufficient
Solution Approach 1:
The patent creates a composite copolymer system combining fumaric diester units with (meth)acrylic ester units containing oxetanyl and/or tetrahydrofurfuryl groups. This composite structure integrates the heat resistance of fumaric diester with the optical clarity and crosslinking capability of (meth)acrylic ester units, achieving both high heat resistance and excellent transparency simultaneously.
Solution Approach 2:
The patent optimizes the compositional parameters by controlling the molar ratio of fumaric diester units to (meth)acrylic ester units within specific ranges (5-95 mol% fumaric diester). This parameter optimization ensures that the copolymer maintains adequate heat resistance while achieving the required transparency and optical properties for display applications.
2Illumination intensity
If specific (meth)acrylic ester units with oxetanyl and tetrahydrofurfuryl groups are incorporated, then transparency is improved, but heat resistance may be compromised
Solution Approach 1:
The patent combines (meth)acrylic ester units containing transparent oxetanyl and/or tetrahydrofurfuryl groups with heat-resistant fumaric diester units in a copolymer structure. This composite approach allows the transparent (meth)acrylic ester units to provide optical clarity while the fumaric diester units contribute heat resistance, achieving both properties simultaneously through synergistic combination.
Solution Approach 2:
The patent carefully controls the compositional parameters by limiting the (meth)acrylic ester unit content to 5-95 mol% and optimizing the specific ratio of oxetanyl-containing to tetrahydrofurfuryl-containing units. This parameter control ensures that transparency is maximized while heat resistance is maintained at adequate levels for display applications.
3Temperature
If copolymer composition is optimized for heat resistance, then temperature stability is improved, but optical properties such as light transmittance and haze are insufficient
Solution Approach 1:
The patent creates a multi-functional copolymer composite containing fumaric diester units for temperature stability, (meth)acrylic ester units with oxetanyl groups for crosslinking and structural integrity, and tetrahydrofurfuryl groups for optical clarity. This composite structure achieves simultaneous optimization of temperature stability, light transmittance, and haze properties.
Solution Approach 2:
The patent optimizes multiple compositional parameters including the overall copolymer composition, the ratio of oxetanyl-containing to tetrahydrofurfuryl-containing (meth)acrylic ester units, and the molecular weight distribution. These parameter optimizations enable the material to achieve adequate temperature stability while attaining excellent optical properties with light transmittance above 90% and haze below 5%.
Data Source
AI summary
A novel fumaric diester copolymer suitable for used in an optical material having excellent heat resistance and transparency is provided. The fumaric diester copolymer comprises a specific fumaric diester residue, and at least one (meth)acrylic ester residue unit selected from a specific (meth)acrylic ester residue unit having an oxetanyl group and a specific (meth)acrylic ester residue unit having a tetrahydrofurfuryl group, and has a number average molecular weight of from 1,000 to 500,000.