Transfer Sheet Hard Coat Primer Polyurethane Weather Resistance
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Solution Overview
Problem
Conventional transfer sheets fail to provide sufficient weather resistance to resin molded articles, despite offering some hard coat properties, particularly in exterior or semi-exterior applications exposed to direct sunlight and weather.
Innovation Solution
A transfer sheet with a specific layer structure comprising a base material film, a hard coat layer formed from a cured product of a curable resin, and a primer layer made of a binder resin with polyurethane having a mass average molecular weight of 40,000 to 100,000 and 1 to 30% acrylic component, enhancing weather-resistant adhesion between the hard coat and primer layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a conventional transfer sheet with a hard coat layer is used, then hard coat properties (scratch resistance) are imparted to the resin molded article, but weather resistance is insufficient
Solution Approach 1:
The transfer sheet is divided into multiple functional layers: a base material film, a hard coat layer formed from curable resin, and a primer layer made of binder resin with polyurethane. This segmentation allows each layer to perform its specific function - the hard coat layer provides scratch resistance while the primer layer with specific polyurethane composition (mass average molecular weight of 40,000 to 100,000 and 1 to 30% acrylic component) provides weather-resistant adhesion, collectively resolving the contradiction between hard coat properties and weather resistance
Solution Approach 2:
The invention uses composite material structures where the hard coat layer (curable resin) is combined with a primer layer containing specific polyurethane binder resin. This composite approach integrates the scratch resistance of the hard coat layer with the weather-resistant adhesion properties of the polyurethane-based primer layer, achieving both hard coat properties and improved weather resistance simultaneously
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 solution effectively imparts excellent weather resistance and hard coat properties to resin molded articles, ensuring the hard coated article meets the performance requirements for exterior or semi-exterior applications.
Implementation Method 1
a hard coat layer formed of a cured product of a curable resin
Implementation Method 2
an adhesive layer in this order... capable of imparting excellent weather resistance together with hard coat properties
Data Source
AI summary
The purpose of the present invention is to provide a transfer sheet capable of providing hard coat properties and excellent weather resistance to a resin molded article such as organic glass. The transfer sheet has, in order, a base material film for mold release, a hard coat layer, a primer layer, and an adhesive layer. The weather resistance and adhesiveness of the hard coat layer and the primer layer are improved and hard coat properties and excellent weather resistance can be provided to a resin molded article being the transfer object, as a result of: the hard coat layer being formed from a cured product of a resin composition including a curable resin; and the primer layer being formed from a binder resin including a polyurethane having a mass-average molecular weight of 40,000-100,000 and including 1-30% by mass of an acrylic component.