Cyclic Olefin Copolymer Varnish With High-Solid Solution Stability

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Solution Overview

Problem

Cyclic olefin-based copolymers with crosslinkable groups face issues with solubility and fluidity when a large amount is dissolved in toluene, leading to impaired impregnability into fiber base materials, affecting the stability of varnish and circuit board manufacturing.

Innovation Solution

A method for producing a varnish-like cyclic olefin-based copolymer composition involving copolymerization of olefins, cyclic non-conjugated dienes, and cyclic olefins using a catalyst system comprising transition metal compounds and organic compounds to maintain a solution state for a longer period, even with high solid content.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If a large amount of cyclic olefin-based copolymer is dissolved in toluene to achieve high solid content, then the impregnability into fiber base material is improved, but gelation occurs and fluidity is impaired

Engineering Contradiction:

Improvesolid contentVSAvoidfluidity

Core Design Contradiction:

Quantity of substanceVSEase of operation

Solution Approach 1:

The patent changes the chemical structure parameters of the cyclic olefin-based copolymer by introducing specific repeating units ( Formulae I, III, and V) with controlled molecular weights and compositions. This structural modification allows the polymer to maintain solubility in toluene at high solid contents (30-70 mass%) without gelation, thereby preserving fluidity while increasing the quantity of polymer that can be dissolved.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite system consisting of the cyclic olefin-based copolymer (comprising repeating units from Formulae I, III, and V) and toluene solvent. This composite varnish-like composition maintains a stable solution state at high solid contents, preventing gelation and ensuring both high polymer content and good fluidity for impregnation processes.

Inventive Principle:

Principle #40Composite materials

2Quantity of substance

If the cyclic olefin-based copolymer is dissolved in toluene at high solid content, then the impregnability into fiber base material is improved, but the solution state is not maintained for long periods

Engineering Contradiction:

Improvesolid contentVSAvoidsolution state stability

Core Design Contradiction:

Quantity of substanceVSDuration of action of stationary object

Solution Approach 1:

The patent modifies the molecular weight distribution and chemical structure parameters of the cyclic olefin-based copolymer by incorporating specific repeating units ( Formulae I, III, and V). These parameter changes enable the polymer to maintain a stable solution state in toluene at high solid contents (30-70 mass%) for extended periods without precipitation or gelation, ensuring long-term storage stability.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If crosslinkable groups are introduced to the cyclic olefin-based copolymer, then the dielectric characteristics are improved, but the solubility in toluene at high solid content is reduced

Engineering Contradiction:

Improvedielectric characteristicsVSAvoidsolubility

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The patent carefully controls the structural parameters of the cyclic olefin-based copolymer by incorporating specific repeating units ( Formulae I, III, and V) with appropriate molecular weights and compositions. This controlled structural modification enables the polymer to maintain good solubility in toluene at high solid contents (30-70 mass%) while still providing the necessary crosslinkable groups for achieving excellent dielectric characteristics after crosslinking.

Inventive Principle:

Principle #35Parameter changes

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 method enables the production of a varnish-like composition that maintains stability and solubility, ensuring stable impregnation into fiber base materials and improving circuit board manufacturing processes.

Implementation Method 1

copolymerizing an olefin, a cyclic non-conjugated diene, and a cyclic olefin in a presence of a catalyst for olefin polymerization, containing a transition metal compound (A) and a compound (B)

Methodology Applied

Scientific EffectCatalysis: Catalysis

Data Source

PatentUS20250388767A1Method for producing varnish-like cyclic olefin copolymer composition, cyclic olefin copolymer composition, crosslinked product, film, or sheet, laminate, circuit board, electronic device, and prepreg

Publication Date: 2025.12.25 MITSUI CHEMICALS INC

AI summary

A method for producing a varnish-like cyclic olefin-based copolymer composition including a cyclic olefin-based copolymer and an organic solvent, the cyclic olefin-based copolymer including one or more repeating units derived from an olefin, one or more repeating units derived from a cyclic non-conjugated diene, and one or more repeating units derived from a cyclic olefin, the method includes a step of copolymerizing an olefin, a cyclic non-conjugated diene, and a cyclic olefin in a presence of a catalyst containing a transition metal compound and a compound, the transition metal compound contains one or two or more selected from the group consisting of a transition metal compound and a transition metal compound, and the compound contains one or two or more selected from the group consisting of an organic metal compound, an organic aluminum oxy compound, and a compound that reacts with the transition metal compound to form an ion pair.