β-1,3-Glucan Derivative Adhesive Composition for Low-Temperature Adhesion
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Solution Overview
Problem
Pressure-sensitive adhesive sheets formed from β-1,3-glucan derivatives exhibit insufficient adhesiveness in low-temperature environments.
Innovation Solution
A pressure-sensitive adhesive composition comprising a β-1,3-glucan derivative with two acyl groups, each having a carbon number of 8 or more, and different carbon numbers, is used to form a pressure-sensitive adhesive sheet with a low glass transition temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a β-1,3-glucan derivative with acyl groups is used as a pressure-sensitive adhesive, then adhesive properties are improved, but the glass transition temperature becomes too high for low-temperature adhesion
Solution Approach 1:
The invention changes the chemical parameters of the acyl groups by introducing two different types (acyl group a with 10-18 carbons and acyl group b with 3-7 carbons) with specific carbon number ranges. This parameter optimization allows the adhesive to maintain reliability while achieving a glass transition temperature of -50°C or higher, solving the contradiction between adhesive performance and temperature adaptability.
Solution Approach 2:
The invention creates a composite molecular structure by combining two different acyl group types on the β-1,3-glucan backbone. This composite approach with heterogeneous acyl groups (different carbon numbers) provides synergistic effects that simultaneously improve adhesive strength and control glass transition temperature, resolving the technical contradiction.
2Strength
If the carbon number of acyl groups is increased to improve adhesiveness, then adhesive strength is enhanced, but the glass transition temperature increases making low-temperature application difficult
Solution Approach 1:
The invention applies local quality by creating heterogeneous acyl group distribution on the β-1,3-glucan molecules. Different regions (acyl group a and acyl group b) have different carbon numbers and properties, with acyl group b (shorter chain) helping to maintain flexibility and lower glass transition temperature while acyl group a (longer chain) provides adhesive strength. This local differentiation resolves the contradiction between strength and temperature adaptability.
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 enables the production of a pressure-sensitive adhesive sheet with enhanced adhesiveness in low-temperature conditions.
Implementation Method 1
the pressure-sensitive adhesive sheet having a low glass transition temperature
Data Source
AI summary
The present invention provides a pressure-sensitive adhesive composition suitable for producing a pressure-sensitive adhesive sheet having a low glass transition temperature. The pressure-sensitive adhesive composition according to the present invention includes a β-1,3-glucan derivative G. The β-1,3-glucan derivative G has an acyl group a having a carbon number of 8 or more and an acyl group b having a carbon number different from the carbon number of the acyl group a, and the carbon number of the acyl group b is 8 or more. A pressure-sensitive adhesive sheet 1 according to the present invention is formed from the pressure-sensitive adhesive composition. A laminate 10 according to the present invention includes the pressure-sensitive adhesive sheet 1 and a substrate sheet 2.