Boron-Doped Silicon Oxide Coating for Scratch-Resistant Polymers

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Solution Overview

Problem

Uncoated polymer substrates, such as ABS and PC, have a dull appearance and lack sufficient mechanical and chemical resistance, necessitating thick lacquer layers that are time-consuming and provide inadequate scratch protection.

Innovation Solution

A decorative coating comprising a boron doped silicon oxide top layer is applied using plasma enhanced chemical vapor deposition (PECVD), which includes a process with a linear hollow-cathode plasma source, reactive gas, and precursor gas to achieve a durable, aesthetically appealing finish.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If thick lacquer layers are applied to polymer substrates, then mechanical protection and aesthetic appearance are improved, but the deposition process becomes time-consuming and requires large quantities of chemicals

Engineering Contradiction:

Improvemechanical protectionVSAvoiddeposition process time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The invention changes the parameters of the coating material from conventional organic lacquers to inorganic boron-doped silicon oxide, enabling the formation of a thin yet highly durable protective layer through PECVD process that deposits material at controlled rates to achieve optimal thickness and performance

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention uses a composite inorganic coating system consisting of silicon oxide doped with boron, creating a material that combines the hardness and chemical resistance of ceramic materials with the ability to form adherent thin films on polymer substrates through plasma-enhanced deposition

Inventive Principle:

Principle #40Composite materials

2Illumination intensity

If conventional lacquer layers are applied to polymer substrates, then aesthetic appearance is improved, but scratch resistance remains insufficient

Engineering Contradiction:

Improveaesthetic appearanceVSAvoidscratch resistance

Core Design Contradiction:

Illumination intensityVSStrength

Solution Approach 1:

The invention changes the material composition from organic lacquer to inorganic boron-doped silicon oxide, which inherently provides higher hardness and scratch resistance while maintaining aesthetic properties through controlled optical parameters of the thin film

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention replaces thick, resource-intensive organic lacquer layers with a thin inorganic coating that provides equivalent or superior protection with minimal material consumption, effectively making the coating process more efficient and sustainable

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Illumination intensity

If metal layers are applied to polymer substrates to give metallic appearance, then aesthetic appearance is improved, but resistance to chemical attack and mechanical wear requires additional protective layers

Engineering Contradiction:

Improvemetallic appearanceVSAvoidnumber of protective layers

Core Design Contradiction:

Illumination intensityVSDevice complexity

Solution Approach 1:

The invention extracts the protective function from separate additional layers and integrates it directly into the topcoat formulation, creating a single-layer solution that simultaneously provides metallic appearance, chemical resistance, and mechanical durability

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The boron-doped silicon oxide coating performs multiple functions simultaneously: it provides the desired aesthetic appearance, protects against chemical attack, resists mechanical wear and scratching, and serves as an adherent top layer, eliminating the need for multiple specialized protective layers

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 boron doped silicon oxide layer enhances substrate shininess and provides improved mechanical resistance to abrasion, while being free of organic adhesion layers and carbon, ensuring good adhesion and chemical protection.

Implementation Method 1

plasma enhanced chemical vapor deposition method for depositing a decorative coating comprising a boron doped silicon oxide protective toplayer

Methodology Applied

Scientific EffectPlasma enhanced chemical vapor deposition: Plasma Enhanced Chemical Vapour Deposition

Implementation Method 2

providing a plasma source, of linear hollow-cathode type, which source has a length, comprising at least one pair of hollow-cathode plasma generating electrodes

Methodology Applied

Scientific EffectPlasma: Plasma

Data Source

PatentUS20260043140A1Decoratively coated polymer substrates and process for obtaining the same

Publication Date: 2026.02.12 AGC GLASS EUROPE SA

AI summary

The present invention concerns a polymer substrate bearing a decorative coating comprising a protective toplayer of boron doped silicon oxide, wherein the boron doped silicon oxide comprises Si, O, B, H and OH groups and wherein the boron content is comprised between 4 and 12 atomic %. The present invention further comprises a process for depositing on a polymer substrate by linear hollow cathode type PECVD a boron doped silicon oxide layer comprising Si, O, B, H and OH groups and wherein the boron content is comprised between 4 and 12 atomic %.