LDS Resin Composition Balancing Permittivity, Loss, and Strength
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Solution Overview
Problem
The challenge is to develop a resin composition that achieves high relative permittivity while maintaining low loss tangent and excellent mechanical strength, as existing solutions with high relative permittivity additives often degrade the mechanical properties of thermoplastic resins.
Innovation Solution
A resin composition comprising 100 parts by mass of a thermoplastic resin, 0.3 to 10 parts by mass of an acid-modified polymer, and 5 to 150 parts by mass of a laser direct structuring additive, which includes a conductive oxide with a resistivity of 5×10^3 Ω·cm or smaller, and reinforcing fibers, specifically designed to enhance mechanical strength and permittivity without increasing loss tangent.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a laser direct structuring additive with high relative permittivity is added to the resin composition, then the relative permittivity of the molded article is improved, but the mechanical strength of the thermoplastic resin deteriorates due to decomposition
Solution Approach 1:
An acid-modified polymer is introduced as an intermediary substance between the LDS additive and the thermoplastic resin. This intermediary component suppresses the decomposition reaction between the LDS additive and the thermoplastic resin, thereby preventing mechanical strength deterioration while maintaining high relative permittivity properties
Solution Approach 2:
The patent specifies precise compositional parameters: 0.3 to 10 parts by mass of acid-modified polymer per 100 parts by mass of thermoplastic resin, and 5 to 150 parts by mass of LDS additive. By controlling these parameter ranges, the patent achieves optimal balance between relative permittivity enhancement and mechanical strength preservation
2Quantity of substance
If the content of laser direct structuring additive is increased to achieve high relative permittivity, then the permittivity performance is improved, but the loss tangent increases
Solution Approach 1:
The patent creates a composite resin composition incorporating multiple components with complementary properties: thermoplastic resin base, acid-modified polymer for compatibility and decomposition suppression, specific LDS additives (conductive oxides or calcium copper titanate) for permittivity enhancement, and reinforcing fibers. This composite approach achieves high relative permittivity while controlling loss tangent through synergistic material interactions
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 effectively achieves high relative permittivity and low loss tangent, along with improved mechanical strength, making it suitable for applications such as antenna fabrication in electronic devices.
Implementation Method 1
LDS is a technology by which laser light is irradiated on a surface of a molded article (resin molded article) that contains an LDS additive for activation, and a metal is then applied to the activated area to form a plating layer
Implementation Method 2
the laser direct structuring additive being a compound being a conductive oxide having a resistivity of 5×10³ Ω·cm or smaller
Implementation Method 3
Addition of the LDS additive having high relative permittivity was, however, occasionally found to induce decomposition of a thermoplastic resin, and to degrade the mechanical strength
Data Source
AI summary
To provide a resin composition having high relative permittivity, while keeping low loss tangent, and excellent mechanical strength; a molded article; and a method for manufacturing a plated molded article. A resin composition comprising: per 100 parts by mass of a thermoplastic resin, 0.3 to 10 parts by mass an acid-modified polymer; 5 to 150 parts by mass of a laser direct structuring additive; and 10 to 150 parts by mass of a reinforcing fiber, the laser direct structuring additive being a compound being a conductive oxide having a resistivity of 5×103 Ω·cm or smaller, and containing at least one type selected from a Group n (n represents an integer of 3 to 16) metal in the periodic table and a Group n+1 metal, or, calcium copper titanate.