Resin Film Thermal Size Stability via Crystallinity Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Resin films made from alicyclic structure-containing polymers with crystallizability tend to have high coefficients of friction, leading to blocking and deformation issues when heated, especially when subjected to knurling treatments like laser irradiation, resulting in uneven winding and potential cracks.
Innovation Solution
A resin film with a thermal size change ratio of 1% or less at 150°C, formed from a hydrogenated product of a ring-opened dicyclopentadiene polymer, is produced by setting the film temperature above the glass transition temperature and below the melting point in a strained state, followed by relaxation, to achieve size stability and prevent deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a film is formed from a resin containing an alicyclic structure-containing polymer having crystallizability, then heat resistance is improved, but the coefficient of friction between films increases causing blocking
Solution Approach 1:
The patent applies parameter changes by controlling the crystallinity degree of the alicyclic structure-containing polymer within a specific range (5% to 80%). By optimizing this parameter, the invention achieves a balance between heat resistance (improved by crystallinity) and blocking prevention (maintained by limiting excessive crystallinity that would increase friction). This parameter optimization resolves the contradiction between the two opposing requirements.
2Manufacturing precision
If knurling treatment is applied to suppress gauge band and scratch, then film surface stability is improved, but deformation such as waviness occurs due to thermal shrinkage
Solution Approach 1:
The patent applies preliminary action by performing knurling treatment on the film surface before the film is subjected to high-temperature processing or winding. This pre-treatment creates the protrusions needed to suppress gauge bands and scratches, while the film's controlled crystallinity ensures minimal thermal shrinkage during subsequent processing, preventing deformation. The sequence of operations and material property control work together to resolve the contradiction.
Solution Approach 2:
The invention controls the crystallinity degree parameter to limit thermal shrinkage ratio to 1.5% or less. This parameter control allows the film to withstand knurling treatment and subsequent high-temperature processing without excessive shrinkage that would cause waviness or deformation, while still maintaining the surface protrusions needed to prevent gauge bands and scratches.
3Ease of manufacture
If laser beam irradiation is used for knurling treatment, then protrusion formation is achieved, but film deformation occurs due to temperature increase
Solution Approach 1:
The patent applies parameter changes by controlling the film's crystallinity degree and resulting thermal shrinkage ratio to 1.5% or less. This material parameter optimization allows the film to undergo laser beam irradiation for efficient knurling treatment without excessive thermal shrinkage that would cause deformation. The controlled crystallinity provides thermal stability during the high-energy processing.
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 film exhibits excellent size stability in high-temperature environments, reducing the occurrence of blocking and deformation, and allows for stable winding without cracks, even when subjected to knurling treatments.
Implementation Method 1
an absolute value of a thermal size change ratio when the film is heated at 150° C. for 1 hour is 1% or less in any in-plane direction of the film
Implementation Method 2
a technology of crystallizing an alicyclic structure-containing polymer in a film formed from a resin containing an alicyclic structure-containing polymer having crystallizability by heating the film
Implementation Method 3
the film is irradiated with a laser beam to form a protrusion at a position which is irradiated with the laser beam
Implementation Method 4
the resin containing an alicyclic structure-containing polymer having crystallizability is likely to be largely changed in size (usually, thermally shrunk) in a high-temperature environment
Data Source
AI summary
Provided is a barrier film including a resin film and a barrier layer provided on the resin film. Also provided is an electroconductive film including a resin film and an electroconductive layer provided on the resin film. The resin film is formed of a resin containing an alicyclic structure-containing polymer having crystallizability. An absolute value of a thermal size change ratio when the resin film is heated at 150° C. for 1 hour is 1% or less in any in-plane direction of the resin film.