Laser-Weldable Resin Composition With Marking and Hydrolysis Resistance
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Solution Overview
Problem
Resin compositions used in laser welding face challenges in maintaining high laser light transmittance for welding while also being capable of laser marking, and they often suffer from hydrolysis resistance issues when dyes are used for coloration.
Innovation Solution
A resin composition incorporating a bismuth compound and an aromatic ring-containing compound, such as those with a benzene or benzo condensed ring, is used, which allows for both laser welding and marking while enhancing hydrolysis resistance by balancing light transmittance and coloration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a transmitting resin member is colored with a pigment having high laser light absorptance to match the absorbing resin member's color, then color consistency is improved, but laser light transmittance decreases and laser welding becomes impossible
Solution Approach 1:
The patent changes the chemical composition parameters of the resin by incorporating specific compounds (carboxylic acid compounds with aromatic rings, hydroxyl compounds with aromatic rings, and metal compounds) to achieve both color consistency and laser light transmittance. This compositional parameter adjustment allows the resin to simultaneously absorb visible light for color matching while transmitting laser light for welding.
Solution Approach 2:
The patent creates a composite resin system by combining multiple functional components: base resin, carboxylic acid compounds, hydroxyl compounds, and metal compounds. This composite approach enables the material to exhibit dual properties of color absorption and laser transmission that cannot be achieved with single compounds alone.
2Use of energy by moving object
If a dye is used to color the transmitting resin member to maintain laser light transmittance, then laser welding capability is preserved, but hydrolysis resistance deteriorates
Solution Approach 1:
The patent introduces metal compounds as intermediary substances that mediate between the dye and the resin matrix. These metal compounds form stable coordination complexes with the dye molecules, protecting them from hydrolysis while maintaining their optical properties for laser transmission.
Solution Approach 2:
The patent modifies the chemical environment parameters by adding metal compounds that alter the stability characteristics of the dye-resin system. This parameter change enhances hydrolysis resistance without compromising laser light transmittance.
3Stability of the object's composition
If the transmitting resin member is colored black to match the absorbing resin member, then designability and appearance are improved, but laser light transmittance decreases and laser marking becomes impossible
Solution Approach 1:
The patent precisely controls the concentration and type of coloring compounds to achieve a specific optical parameter range. By adjusting these parameters, the resin attains color matching capability while maintaining sufficient laser light transmittance for both welding and marking operations.
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 effective laser welding and marking with improved hydrolysis resistance, maintaining sufficient transmittance and color consistency, and can be used to produce molded articles with various colors without significant transmittance loss.
Implementation Method 1
a laser-transmitting resin member including a laser transmissive material... and a laser-absorbing resin member including a laser light-absorptive material... are superposed on each other and irradiated with laser light from the transmitting resin member side to allow the interface thereof with the absorbing resin member to generate heat for welding
Implementation Method 2
the transmitting resin member has laser light transmittance as high as possible... the resin composition being capable of being laser-marked
Data Source
AI summary
The resin composition for laser marking and for laser welding contains 100 parts by mass of a thermoplastic resin, 0.002 to 10.000 parts by mass of a bismuth compound, 0.1 to 5.0 parts by mass of organic dyes, and 0.1 to 18 parts by mass of an aromatic ring-containing compound comprising a benzene ring and/or a benzo condensed ring.