Temperature-stabilization of convertible functional inks by disruption of conduction paths

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Solution Overview

Problem

Convertible inks used in electronic structures face issues where insulating patterns unintentionally convert to a conductive state during thermal processes like soldering or microelectronic packaging, negating the intended patterning.

Innovation Solution

Incorporating a stabilizing material with a polymeric network and high aspect ratio particles into the inks to prevent conductive path formation during thermal exposure, using a polymer to fill gaps and disrupt conductive particle coalescence.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If thermal treatment is applied to convert insulating patterns to conductive state, then conductivity is improved, but unintended conversion of insulating patterns occurs

Engineering Contradiction:

Improvepattern integrityVSAvoidunintended conductive conversion

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

A stabilizing material layer is introduced as an intermediary between the convertible ink and the thermal environment. This stabilizing layer acts as a protective mediator that selectively allows desired conductive conversion while blocking unintended conversion in insulating patterns during thermal processes like soldering.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The stabilizing material is applied in advance before thermal processing to prevent unintended conductive conversion. By pre-establishing this protective layer, the patent counteracts the harmful thermal effects before they can cause unintended pattern conversion during subsequent thermal processes.

Inventive Principle:

Principle #9Preliminary anti-action

2Stability of the object's composition

If high aspect ratio particles are added to disrupt conductive paths, then temperature stability is improved, but ink composition complexity increases

Engineering Contradiction:

Improvetemperature stabilityVSAvoidink composition

Core Design Contradiction:

Stability of the object's compositionVSDevice complexity

Solution Approach 1:

The patent creates a composite stabilizing material combining high aspect ratio particles (such as boron nitride or alumina) with a polymer matrix. This composite structure provides both the geometric disruption needed to block conductive paths and the thermal stability required to maintain pattern integrity during thermal processing.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The high aspect ratio particles change the physical parameters of the ink composition by introducing geometric barriers. Their elongated shape and specific aspect ratio (length-to-diameter ratio) create tortuous paths that disrupt potential conductive networks while maintaining the overall ink processability and printability.

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 stabilizing material effectively maintains the insulating state of ink patterns despite thermal treatments, ensuring the integrity of the intended conductive traces.

Implementation Method 1

using a polymer to fill gaps and disrupt conductive particle coalescence

Methodology Applied

Scientific EffectGap filling:

Implementation Method 2

The stabilizing material effectively maintains the insulating state of ink patterns despite thermal treatments

Methodology Applied

Scientific EffectThermal stabilization:

Data Source

PatentUS12492318B2Temperature-stabilization of convertible functional inks by disruption of conduction paths

Publication Date: 2025.12.09 RAYTHEON CO

AI summary

An ink stabilizing composition includes a polymeric network including an acrylate polymer and a plurality of high aspect ratio particles each having an aspect ratio of about 2:1 to about 30:1 and an average particle diameter of about 0.5 to about 1.2 micrometers.