Polyester-Polycarbonate Resin Composition for Laser Marking and Welding
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Solution Overview
Problem
There is a need for a resin composition that can be laser-marked while maintaining laser weldability, with the transmitting and absorbing resin members being colored similarly to enhance designability, and also considering environmental sustainability by using recycled materials.
Innovation Solution
A resin composition comprising a blend of polyester and polycarbonate resins, with a mass ratio of 10/90 to 90/10, containing recycled polycarbonate with a molecular weight distribution of 2.8 or more, and incorporating aluminum elements, inorganic fillers like glass fibers, and a phosphorus-based stabilizer, which allows for excellent laser marking and welding properties without the need for additional laser-marking agents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a transmitting resin member is colored with a pigment having high laser light absorptance, then the designability is improved, but laser light transmission is inhibited and laser welding becomes impossible
Solution Approach 1:
The patent applies parameter changes by carefully controlling the concentration of aluminum elements (0.50 to 1000.00 ppm) in the polycarbonate resin and optimizing the mass ratio between polyester and polycarbonate resins (10/90 to 90/10). These parameter adjustments enable the resin to achieve both laser marking capability and sufficient laser light transmission for welding, resolving the contradiction between designability and laser transmission.
2Loss of information
If laser marking is performed on a transmitting resin member, then information visibility is improved, but laser light transmission is blocked and welding cannot be performed
Solution Approach 1:
The patent resolves this contradiction by optimizing the aluminum element content (0.50 to 1000.00 ppm) and resin composition ratio (10/90 to 90/10 polyester to polycarbonate). These parameter changes enable the resin to achieve sufficient laser absorption for marking while maintaining adequate laser transmission for subsequent welding operations.
3Object-generated harmful factors
If recycled resins are used, then environmental burden is reduced, but material consistency and performance may be compromised
Solution Approach 1:
The patent applies local quality by specifying particular properties for the recycled polycarbonate resin, including aluminum element content (0.50 to 1000.00 ppm), molecular weight distribution (2.8 or more), and mass ratio with polyester resin (10/90 to 90/10). These localized quality controls ensure that recycled materials meet specific performance requirements for laser marking and welding, maintaining reliability while reducing environmental burden.
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 resin composition achieves excellent laser marking and welding capabilities, is environmentally friendly due to the use of recycled materials, and maintains mechanical strength and heat resistance, making it suitable for various applications.
Implementation Method 1
laser welding, which has little influence on electronic components, has been frequently used... a laser-transmitting resin member including a laser light-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
a laser-transmitting resin member including a laser light-transmissive material... irradiated with laser light from the transmitting resin member side
Implementation Method 3
a resin composition that is for use as a laser-transmitting resin member in laser welding and capable of being laser-marked... containing recycled polycarbonate with a molecular weight distribution of 2.8 or more, and incorporating aluminum elements
Data Source
AI summary
A resin composition contains a polyester resin and a polycarbonate resin, wherein a mass ratio between the polyester resin and the polycarbonate resin is 10/90 to 90/10, wherein a total of the polyester resin and the polycarbonate resin is 100 parts by mass, and a content of aluminum element contained in the polycarbonate resin is 0.50 to 1000.00 ppm by mass per 100 parts by mass of the polycarbonate resin.