Thermoplastic Resin Composition for Laser Marking and Soft Grip
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Solution Overview
Problem
Conventional thermoplastic resin compositions for laser marking fail to achieve a balance between excellent laser marking properties, flexibility, good tactile feel, high grip performance, and slip resistance, while maintaining optical properties.
Innovation Solution
A thermoplastic resin composition comprising an acrylic component-containing reinforced resin and a soft elastomer at a specific ratio, where the content of methyl methacrylate units (X) and the soft elastomer (Y) satisfy the formula 0.1 < Y/(X+Y) < 0.9, with the reinforced resin having a Duro hardness of 90 or more and the elastomer having a Duro hardness of less than 90.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional thermoplastic resin compositions are used for laser marking, then excellent laser marking properties and colored appearance can be achieved, but cushioning properties, touch, and tactile feel are insufficient
Solution Approach 1:
The patent uses a composite material system consisting of a diene-based rubber-reinforced resin (providing cushioning and tactile properties) combined with specific additives (carbon black, laser marking agents) to achieve both excellent laser marking properties and improved tactile feel. The composite structure allows the rubber phase to provide softness while the resin matrix maintains laser responsiveness.
Solution Approach 2:
The patent optimizes specific parameters including the hardness of the diene-based rubber (50-90 A-type Durometer), the content of carbon black (1-50 parts by mass per 100 parts of resin), and the molecular weight of the reinforced resin to balance laser marking performance with tactile properties. By adjusting these parameters, the composition achieves both sharp color development during laser marking and comfortable cushioning properties.
2Manufacturing precision
If marking composition is applied to surface before laser irradiation, then clear marking can be achieved, but productivity decreases due to additional processing steps
Solution Approach 1:
The patent incorporates laser marking agents and carbon black directly into the resin composition during the molding process, so that the material is pre-prepared for laser marking. This eliminates the need for separate marking composition application steps, allowing clear markings to be achieved directly through laser irradiation of the molded article, thereby improving productivity.
Solution Approach 2:
The patent combines the functions of the base resin, reinforcing agents, coloring agents, and laser marking agents into a single integrated thermoplastic composition. This merging of multiple functional components into one material system eliminates separate processing steps for applying marking compositions, enabling direct laser marking on the molded article.
3Ease of operation
If rubber content is increased to improve cushioning properties, then tactile feel improves, but laser marking properties and optical properties deteriorate
Solution Approach 1:
The patent precisely controls the hardness parameter of the diene-based rubber within the range of 50-90 A-type Durometer and limits the rubber content to achieve optimal balance. This parameter optimization ensures sufficient cushioning properties while maintaining the optical clarity and laser marking responsiveness of the overall composition.
Solution Approach 2:
The patent creates a composite where the diene-based rubber provides cushioning properties while the thermoplastic resin matrix maintains optical clarity and laser marking capability. The synergistic combination allows the rubber phase to contribute to tactile feel without compromising the overall laser marking properties of the molded article.
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 achieves a molded article with excellent laser marking properties, flexibility, good tactile feel, high grip performance, and slip resistance, while maintaining optical properties.
Implementation Method 1
irradiating a resin molded article that is dark in color due to a black substance with a laser, and using the energy of the laser to induce chemical changes in the resin and chemical changes in the black substance
Implementation Method 2
using the energy of the laser to induce chemical changes in the resin and chemical changes in the black substance, and the like at the irradiated area, and causing the irradiated area to develop a color derived from the resin
Data Source
AI summary
A thermoplastic resin composition including a component (A) and a component (B) identified below, wherein, when a content of methyl methacrylate units is expressed as X % by mass and a content of the component (B) is expressed as Y % by mass, based on 100% by mass of a total of the component (A) and the component (B), a formula (1) identified below is satisfied.0.1<Y/(X+Y)<0.9(1)Component (A): An acrylic component-containing reinforced resin comprising a rubber-containing graft copolymer (a1) having a Dureau hardness (A type) of 90 or more; or an acrylic component-containing reinforced resin comprising the rubber-containing graft copolymer (a1) and a (co)polymer (a2) not containing a rubbery polymer, wherein a methyl methacrylate unit is contained in the rubber-containing graft copolymer (a1) and/or the (co)polymer (a2) Component (B): A soft elastomer having a Dureau hardness (A type) of less than 90.