Terminally Modified Polycarbonate Resin UV Absorbing End Groups

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Solution Overview

Problem

Existing terminally modified polycarbonate resins with UV absorbing capacity are highly reactive and lose their functionality when exposed to ultraviolet light, and those with UV absorbers like triazole or benzophenone have low reactivity, making them unsuitable for block copolymers or reactive resin modifiers.

Innovation Solution

A novel terminally modified polycarbonate resin with a specific structural unit derived from a dihydric phenol, such as bisphenol compounds, and an end group represented by General formula (A), which includes a divalent group like -O-, -S-, -SO-, -SO2-, -CO-, and a terminating agent like RUVA-93, providing excellent UV absorbing capacity and stability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If polycarbonates having a vinyl end group or conjugated double bond are used, then UV absorbing capacity is improved, but reactivity increases causing polymerization by ultraviolet light and loss of UV absorber function

Engineering Contradiction:

ImproveUV absorbing capacityVSAvoidfunctional stability under UV exposure

Core Design Contradiction:

Illumination intensityVSReliability

Solution Approach 1:

The patent changes the chemical structure parameter of the end group from highly reactive vinyl/conjugated double bonds to triazole or benzophenone-based UV absorbers, which have appropriate reactivity levels that prevent spontaneous polymerization while maintaining UV absorption capability

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses terminally modified polycarbonate oligomers with controlled molecular weight and specific end group structures that provide UV absorption functionality without the instability of highly reactive groups, effectively replacing unstable designs with stable alternatives

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

2Reliability

If polycarbonates having triazole or benzophenone-based UV absorber bound to end are used, then weatherability is improved, but reactivity as a raw material for block copolymer or reactive resin modifier decreases

Engineering Contradiction:

ImproveweatherabilityVSAvoidreactivity for block copolymer production

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent optimizes the molecular weight parameter of the polycarbonate oligomer to a specific range (viscosity-average molecular weight 1,000-10,000) and controls the end group structure to balance weatherability with sufficient reactivity for further polymerization reactions

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite structure combining polycarbonate oligomer backbone with triazole or benzophenone-based UV absorber end groups, achieving a material that integrates both weatherability and controlled reactivity properties

Inventive Principle:

Principle #40Composite materials

3Illumination intensity

If existing terminally modified polycarbonate resins are used, then UV absorbing capacity is provided, but further development is needed to achieve excellent UV absorbing capacity and stability

Engineering Contradiction:

ImproveUV absorbing capacityVSAvoidphotostability

Core Design Contradiction:

Illumination intensityVSReliability

Solution Approach 1:

The patent develops composite materials combining specific polycarbonate oligomer structures with optimized triazole or benzophenone-based UV absorber end groups, achieving superior UV absorption and photostability compared to existing resins

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent systematically optimizes multiple parameters including molecular weight, end group structure, and substituent patterns to achieve the target performance of excellent UV absorbing capacity and photostability

Inventive Principle:

Principle #35Parameter changes

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 resin exhibits excellent UV absorbing capacity and photostability, with transmittance at 330 nm of 1% or less, allowing it to be effectively used in various applications without losing functionality under UV exposure.

Implementation Method 1

The resin exhibits excellent UV absorbing capacity and photostability, with transmittance at 330 nm of 1% or less

Methodology Applied

Scientific EffectUV absorption: Absorption (EM radiation)

Data Source

PatentEP3950771B1Polycarbonate resin

Publication Date: 2024.10.09 MITSUBISHI GAS CHEM CO INC

AI summary

The present invention provides a terminally modified polycarbonate resin that has ultraviolet absorbing capability. More specifically, the present invention provides a terminally modified polycarbonate resin which has a structure represented by general formula (A) and a constituent unit that is derived from a dihydric phenol. (In general formula (A), R1 represents a hydrogen atom or an alkyl group having 1-6 carbon atoms; R2 represents an alkylene group having 1-6 carbon atoms; R3 represents a hydrogen atom or a methyl group; R4 represents a hydrogen atom or a halogen atom; and ∗ represents the bonding position to the main chain of the polycarbonate resin.)