Etching Sulfur-Containing Thermoplastic Resin with Sulfoxide Moderators
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Solution Overview
Problem
Existing methods for etching sulfur-containing thermoplastic resin-substrates, such as PPS, often suffer from destructive etching, insufficient etching, or require harmful and sophisticated conditions, making them unsuitable for modern applications like 5G communication systems.
Innovation Solution
A method involving a liquid etching composition comprising a mineral acid (sulfuric acid or nitric acid) and a dialkyl sulfoxide or phenyl-comprising sulfoxide, which acts as an etching moderator, allowing for controlled etching under moderate conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If common etching methods/compositions are used on sulfur-containing thermoplastic resin-substrates, then the resin-substrate maintains its chemical and thermal resistance, but the etching effectiveness is insufficient
Solution Approach 1:
The patent changes the chemical parameters of the etching composition by introducing a specific combination of mineral acid (sulfuric or nitric acid) with a sulfoxide compound. This parameter change enables effective etching of sulfur-containing thermoplastic resin-substrates while maintaining their inherent chemical and thermal resistance properties through controlled surface modification rather than complete material removal.
Solution Approach 2:
The sulfoxide compound acts as an intermediary substance that facilitates the etching process. It mediates between the mineral acid and the sulfur-containing thermoplastic resin-substrate, enabling effective interaction and surface modification without requiring excessive acid concentration or harsh conditions that would compromise the resin's resistance properties.
2Manufacturing precision
If aggressive etching compositions are used to achieve sufficient etching, then etching effectiveness improves, but the etching becomes too destructive
Solution Approach 1:
The patent modifies the etching composition parameters by combining mineral acid with a sulfoxide compound, which changes the etching mechanism from aggressive material removal to controlled surface modification. This parameter change achieves sufficient etching effectiveness while preventing destructive effects on the resin-substrate structure.
Solution Approach 2:
The patent converts the inherent sulfur content of the thermoplastic resin-substrate, which normally provides chemical resistance and prevents etching, into a benefit by using it as the active site for controlled surface modification. The sulfur in the resin substrate serves as both the protective element and the etching target, creating a beneficial balance between resistance and etchability.
3Manufacturing precision
If traditional etching compositions are used, then etching can be achieved, but harmful substances and sophisticated conditions are required
Solution Approach 1:
The patent changes the chemical composition parameters by using mineral acid combined with a sulfoxide compound, which allows etching to proceed under moderate conditions without requiring harmful substances. The specific chemical combination enables effective etching through a different mechanism that avoids the need for excessive acid concentration, fluorine compounds, or other harmful agents.
4Manufacturing precision
If fluoride-containing etching compositions are used, then etching effectiveness improves, but environmental and worker safety deteriorates
Solution Approach 1:
The patent extracts and eliminates fluoride-containing substances from the etching composition while maintaining effective etching capability. By removing the harmful fluoride component and replacing it with a mineral acid-sulfoxide combination, the patent achieves the same etching effectiveness without the environmental and worker safety hazards associated with fluoride compounds.
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 method achieves excellent etching results with a broad working window, is easy to handle, and is less detrimental to the environment and workers, while also being fluoride- and bifluoride-free.
Implementation Method 1
contacting with a liquid etching composition comprising (a) a mineral acid selected from the group consisting of sulfuric acid and nitric acid
Implementation Method 2
a dialkyl sulfoxide and/or a phenyl-comprising sulfoxide, which acts as an etching moderator, allowing for controlled etching under moderate conditions
Data Source
AI summary
The present invention relates to a method for etching at least one surface of a sulfur-containing thermoplastic resin-substrate, the method comprising the steps (A) to (C), wherein step (C) is an etching step including a contacting with a liquid etching composition. The liquid etching composition comprises (a) a mineral acid selected from the group consisting of sulfuric acid and nitric acid, and (b) a dialkyl sulfoxide and/or a phenyl-comprising sulfoxide.