PCT Thermoplastic Composition for High Heat and Reflectance

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Solution Overview

Problem

The LED industry faces challenges in developing an easy-to-assemble and economically feasible white, high reflectance surface that is solderable with circuit integration, due to limitations with conventional polymers like LCP, PPS, and PPA, which are either too expensive or unsuitable for LDS applications, especially for 5G network applications.

Innovation Solution

A thermoplastic composition incorporating poly(cyclohexylenedimethylene terephthalate) (PCT) or its copolymers, reinforced with at least 10 wt% glass fiber, combined with a laser direct structuring additive containing tin oxide or antimony oxide, and a reflection additive comprising a titanium compound, achieving a weight ratio of total titanium to the LDS additive or PCT that maintains high heat performance and reflectance properties.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Temperature

If conventional polymers like LCP and PPS are used, then high reflectance and heat resistance are achieved, but cost increases significantly

Engineering Contradiction:

Improveheat resistanceVSAvoidcost

Core Design Contradiction:

TemperatureVSQuantity of substance

Solution Approach 1:

The patent changes the chemical composition parameters by using PCT as base resin and incorporating specific ratios of titanium compound (0.1-5 wt%) and LDS additive (0.1-5 wt%), creating a cost-effective formulation that achieves high heat resistance (HDT > 200°C) without the prohibitive costs of LCP or PPS

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite material system combining PCT base resin with glass fiber reinforcement (10-50 wt%), titanium compound for reflectance, and LDS additive for laser plating, achieving high heat resistance and reflectance properties at lower cost through synergistic material combinations

Inventive Principle:

Principle #40Composite materials

2Ease of manufacture

If PPA is used for LDS applications, then laser direct structuring capability is achieved, but water absorption and dielectric stability deteriorate

Engineering Contradiction:

ImproveLDS capabilityVSAvoiddielectric stability

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent changes the base resin parameter from PPA to PCT, fundamentally altering the material's water absorption characteristics while maintaining LDS capability through the addition of tin oxide or antimony oxide additives, achieving both manufacturability and reliability

Inventive Principle:

Principle #35Parameter changes

3Strength

If high glass fiber content is added to PCT, then mechanical strength and heat resistance are improved, but crystallization and processability are adversely affected

Engineering Contradiction:

Improvemechanical strengthVSAvoidcrystallization

Core Design Contradiction:

StrengthVSEase of manufacture

Solution Approach 1:

The patent optimizes the glass fiber content parameter to a specific range (10-50 wt%) and adjusts processing parameters including melt temperature (260-300°C) and molding conditions to achieve both high mechanical strength and proper crystallization, balancing reinforcement benefits with processability

Inventive Principle:

Principle #35Parameter changes

4Illumination intensity

If titanium compound content is increased, then reflectance is improved, but cost and density increase

Engineering Contradiction:

ImprovereflectanceVSAvoidcost

Core Design Contradiction:

Illumination intensityVSQuantity of substance

Solution Approach 1:

The patent optimizes the titanium compound concentration parameter to a specific range (0.1-5 wt%) that achieves high reflectance (λ* ≥ 70) while minimizing cost and density increases, representing the optimal balance between optical performance and material economy

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 composition achieves high heat distortion temperatures above 200°C, excellent dielectric properties, and high reflectance across a wide wavelength range, making it suitable for LED and 5G network applications while maintaining stability and solderability.

Implementation Method 1

a reflection additive comprising a titanium compound

Methodology Applied

Scientific EffectReflection: Reflection

Implementation Method 2

a laser direct structuring (LDS) additive comprising a tin oxide, an antimony oxide, or a combination thereof

Methodology Applied

Scientific EffectLaser absorption: Absorption (EM radiation)

Data Source

PatentUS12110379B2Articles and structures with high heat and reflectance and laser direct structuring function

Publication Date: 2024.10.08 SHPP GLOBAL TECH BV

AI summary

A thermoplastic composition includes: (a) poly(cyclohexylenedimethylene terephthalate) (PCT) or a copolymer thereof; (b) at least 10 wt % of a reinforcing filler comprising glass fiber; (c) a laser direct structuring (LDS) additive comprising a tin oxide, an antimony oxide, or a combination thereof; and (d) a reflection additive comprising a titanium compound. A weight ratio of total titanium in the composition to the LDS additive in the composition is at least 0.7:1, or a weight ratio of total titanium in the composition to the PCT is 1.1:1 or less.