Cyclic Olefin Copolymer Composition for Copper-Foil Laminate Adhesion

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Solution Overview

Problem

The molecular weight of cyclic olefin resin is difficult to control, leading to poor processability and adhesion issues between the insulating layer and copper foil in carrier boards, resulting in separation and poor yield.

Innovation Solution

A cyclic olefin copolymer with specific structural units and a controlled number average molecular weight of 500 g/mol to 11,000 g/mol, combined with a curable composition, improves solubility and adhesion, forming a laminate with excellent yield.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If cyclic olefin resin is used to form insulating layer, then dielectric properties are improved, but adhesion to copper foil deteriorates

Engineering Contradiction:

Improvedielectric propertiesVSAvoidadhesion

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The patent modifies the molecular weight parameter of cyclic olefin resin to 500-11,000 g/mol and introduces specific structural units (Formula I and Formula II) with controlled ratios to improve adhesion while maintaining dielectric properties

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite cyclic olefin copolymer combining different structural units (Formula I and Formula II) to achieve both good adhesion and dielectric properties, effectively resolving the contradiction between these two requirements

Inventive Principle:

Principle #40Composite materials

2Ease of manufacture

If cyclic olefin resin molecular weight is not controlled, then polymerization is simplified, but processability deteriorates

Engineering Contradiction:

Improvepolymerization simplicityVSAvoidprocessability

Core Design Contradiction:

Ease of manufactureVSEase of operation

Solution Approach 1:

The patent specifies a controlled molecular weight range (500-11,000 g/mol) and structural unit ratios to achieve optimal processability while maintaining manufacturing feasibility through controlled polymerization

Inventive Principle:

Principle #35Parameter changes

3Productivity

If insulating layer is applied to copper foil substrate, then carrier board functionality is achieved, but separation occurs due to poor adhesion

Engineering Contradiction:

Improvecarrier board functionalityVSAvoidadhesion

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent optimizes molecular weight (500-11,000 g/mol) and structural composition to ensure strong adhesion between insulating layer and copper foil, preventing separation and improving yield

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS20250304737A1Cyclic olefin copolymer, curable composition, composite product and laminate

Publication Date: 2025.10.02 CPC CORPORATION

AI summary

A cyclic olefin copolymer comprises a structural unit represented by Formula (I) and a structural unit represented by Formula (II)In the structural unit represented by Formula (II), R1 and R2 independently represent hydrogen, acryloyloxy [CH2═CH—C(O)—O—] or (methacryloyloxy)ethyleneoxy [CHCH3═CH—C(O)—O—C2H5—O—], with the proviso that R1 and R2 are not both hydrogen. The present invention also provides a curable composition comprising the cyclic olefin copolymer described above, a composite product comprising a substrate and a cured product formed from the curable composition, and a laminate comprising the cured product or the composite product.