Laser Marking Resin Composition to Suppress Gas and Blistering

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Solution Overview

Problem

Existing laser marking compositions generate excessive gas and carbonization during printing, leading to blistering and readability issues in printed codes.

Innovation Solution

A laser marking composition comprising a (meth)acrylic resin with a high proportion of structural units derived from acrylic acid alkyl esters and specific metal oxides, such as bismuth, to suppress gas generation and improve visibility and readability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If a resin composition capable of turning black upon laser irradiation is used, then visibility of the printed code is improved, but gas generation and carbonization occur causing blistering and reducing readability

Engineering Contradiction:

ImprovevisibilityVSAvoidgas generation and carbonization

Core Design Contradiction:

Illumination intensityVSObject-affected harmful factors

Solution Approach 1:

The patent changes the chemical composition parameters of the resin by specifying a proportion of structural units derived from acrylic acid alkyl ester containing an alkyl group having 1 to 4 carbon atoms to be 55% by mass or more. This parameter change modifies the resin's thermal and chemical properties to suppress gas generation and carbonization during laser marking while maintaining visibility.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses a composite resin system combining (meth)acrylic resin with specific metal oxides (bismuth, antimony, molybdenum, copper, iron, nickel, chromium, zirconium, or neodymium). This composite material approach leverages the laser absorption properties of metal oxides to achieve blackening upon irradiation while the acrylic resin matrix suppresses harmful gas generation and carbonization.

Inventive Principle:

Principle #40Composite materials

2Illumination intensity

If bismuth-based laser color developing agent is used, then color development is achieved, but heat generated during printing causes deformation making it difficult to read

Engineering Contradiction:

Improvecolor developmentVSAvoidprinting deformation

Core Design Contradiction:

Illumination intensityVSManufacturing precision

Solution Approach 1:

The patent modifies the thermal parameters of the system by incorporating metal oxides with high thermal stability into the resin composition. These metal oxides can withstand the heat generated during laser marking without causing resin deformation, thereby maintaining printing precision while achieving color development.

Inventive Principle:

Principle #35Parameter changes

3Ease of operation

If urethane resin is used for laser marking, then laser printability is achieved, but the resin around inorganic oxide is easily carbonized reducing readability

Engineering Contradiction:

Improvelaser printabilityVSAvoidcarbonization

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The patent changes the chemical composition of the resin from urethane-based to (meth)acrylic-based with high acrylic acid alkyl ester content. This parameter change fundamentally alters the resin's resistance to carbonization while maintaining laser printability, as the acrylic resin structure is more resistant to thermal degradation and carbonization around inorganic oxide particles.

Inventive Principle:

Principle #35Parameter changes

4Stability of the object's composition

If methacrylic resins are used as main component, then resin flexibility is improved, but gas generation and blistering occur easily during printing

Engineering Contradiction:

Improveresin flexibilityVSAvoidgas generation and blistering

Core Design Contradiction:

Stability of the object's compositionVSObject-affected harmful factors

Solution Approach 1:

The patent inverts the conventional approach by making acrylic acid alkyl ester the main component (55% or more) rather than using methacrylic resins as the primary resin. This parameter change suppresses gas generation and blistering during laser marking while the selected acrylic acid alkyl esters with 1 to 4 carbon atoms in the alkyl group maintain appropriate resin flexibility.

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 forms a resin film with excellent visibility and readability while minimizing gas generation, preventing blistering and ensuring accurate printing of codes.

Implementation Method 1

a laser marking method may sometimes be employed

Methodology Applied

Scientific EffectLaser irradiation: Laser

Implementation Method 2

A resin composition capable of turning black upon laser irradiation typically utilizes a reduction reaction of an inorganic oxide by laser light

Methodology Applied

Scientific EffectReduction reaction: Reduction

Implementation Method 3

During reduction, heat is generated, which causes carbonization of the resin or generation of gas

Methodology Applied

Scientific EffectHeat generation: Heating

Data Source

PatentUS20260103615A1Laser marking composition, resin film, and layered body

Publication Date: 2026.04.16 NIPPON CARBIDE KOGYO KK

AI summary

A laser marking composition includes at least one (meth)acrylic resin and a metal oxide containing at leas one metal selected from the group consisting of bismuth, antimony, molybdenum, copper, iron, nickel, chromium, zirconium, and neodymium, in which a proportion of structural units derived from an acrylic acid alkyl ester containing an alkyl group having 1 to 4 carbon atoms with respect to all structural units of the (meth)acrylic resin is 55% by mass or more.