Laser Activatable Polymer Composition for MID Conductive Pathways
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Solution Overview
Problem
Current polymer compositions used in molded interconnect devices (MIDs) for laser direct structuring face challenges with mechanical properties, deformation under load, and unsuitability for lead-free soldering due to flame retardants, and struggle with forming consistent and small conductive pathways.
Innovation Solution
A polymer composition comprising an aromatic polyester, a laser activatable additive, and a mineral filler with specific size characteristics, which enhances mechanical strength, adhesive strength, and surface smoothness, allowing for the formation of conductive pathways with reduced pitch and consistent width and spacing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If flame retardant (BPADP) is added to the polymer composition, then fire resistance is improved, but mechanical properties (deformation temperature under load) deteriorate
Solution Approach 1:
The patent changes the chemical composition parameters by replacing BPADP with alternative flame retardants (such as aluminum hydroxide, magnesium hydroxide, or phosphorus-based compounds) that maintain fire resistance while having less detrimental effects on mechanical properties and laser direct structuring performance
Solution Approach 2:
The patent uses composite material formulations combining the polymer base with specifically selected flame retardant particles and coupling agents, where the composite structure allows fire resistance to be achieved without compromising the mechanical strength and laser activatability of the material
2Ease of manufacture
If conventional polymer composition is used, then ease of manufacture is improved, but suitability for lead-free soldering deteriorates due to low temperature resistance
Solution Approach 1:
The patent modifies the polymer composition parameters by incorporating high-temperature stable additives and optimizing the polymer matrix structure to raise the service temperature range, enabling the material to withstand lead-free soldering temperatures (typically 245-260°C) while remaining manufacturable through conventional processes
3Ease of manufacture
If surface defects are present on the substrate, then ease of manufacture is improved, but manufacturing precision deteriorates due to inability to form consistent small pathways
Solution Approach 1:
The patent changes the surface parameter by optimizing the polymer composition to produce a smoother substrate surface with reduced defects, enabling the laser direct structuring process to form conductive pathways with consistent spacing and width at smaller dimensions
Solution Approach 2:
The patent applies preliminary surface treatment or selects polymer formulations that inherently produce smoother surfaces before the laser activation process, ensuring that the substrate is pre-conditioned to support high-precision pathway formation without requiring additional surface preparation steps
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 enables the formation of conductive pathways with fine pitch, improving mechanical properties and surface quality, enabling more efficient use of space and weight in electronic devices while supporting high-temperature soldering processes.
Implementation Method 1
a computer-controlled laser beam travels over the plastic substrate to activate its surface at locations where the conductive path is to be situated
Data Source
AI summary
A polymer composition that comprises an aromatic polyester, a laser activatable additive, and a mineral filler is provided. The mineral filler has a median size of about 35 micrometers or less and the laser activatable additive has a mean size of about 1000 nanometers or less.