Polyether Polycarbonate Adhesive Solubility and Selective Bonding
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Solution Overview
Problem
Existing selective adhesives have low solubility in solvents, limiting their blending and processing flexibility and causing difficulties in cleaning off adhesive residue from surfaces like fingers.
Innovation Solution
Development of polyether polycarbonate with a specific alkyleneoxy chain structure that dissolves in water or alcohols, allowing for high blending and processing freedom and easy removal, along with a method involving transesterification between carbonate esters and polyether diols to produce the adhesive.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional selective adhesives (natural rubber/synthetic rubber blends) are used, then selective adhesive properties are achieved, but solubility in common solvents is low and cleaning is difficult
Solution Approach 1:
The patent changes the chemical composition parameters by using polyether diols with specific molecular weights (200-50,000) and controlling the polyol content (5-50 mass%), which fundamentally alters the solubility parameters of the adhesive. This enables the adhesive to dissolve in water and alcohols while maintaining selective adhesive properties, resolving the contradiction between ease of cleaning and processing freedom.
Solution Approach 2:
The patent creates a composite adhesive system combining polyether polycarbonate (main component) with optional tackifiers and softening agents. This composite structure allows the adhesive to inherit the solubility benefits of polyether polycarbonate while maintaining the adhesive performance characteristics of traditional formulations, achieving both improved solubility and blending freedom.
2Ease of operation
If polyether polycarbonate with specific structure is used, then solubility in water and alcohols is improved, but adhesive strength may be compromised
Solution Approach 1:
The patent optimizes specific parameters including polyether diol molecular weight (200-50,000), polyol content (5-50 mass%), and polyether polycarbonate molecular weight (50,000-1,000,000). These parameter adjustments ensure the adhesive has sufficient strength while maintaining solubility in water and alcohols, resolving the contradiction between solubility and adhesive strength.
3Ease of manufacture
If aromatic hydrocarbon solvents or acetone are used for conventional adhesives, then processing is possible, but the degree of freedom in blending is limited and cleaning is difficult
Solution Approach 1:
The patent makes the adhesive universally soluble in multiple types of solvents including water, alcohols, and other common solvents. This multi-functionality in solubility allows the adhesive to be processed with various solvent systems and easily cleaned from surfaces, significantly increasing blending freedom while maintaining processing capability.
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 polyether polycarbonate adhesive exhibits selective adhesive properties, adhering to itself while minimizing adhesion to other surfaces, offering improved solubility and ease of cleaning.
Implementation Method 1
dissolving the polyether polycarbonate in a solvent selected from water and alcohols having 1 to 4 carbon atoms
Implementation Method 2
coating the solution on an adherend, and volatilizing the solvent
Data Source
AI summary
The present invention provides polyether polycarbonate having a constituent unit represented by the formula (I), a method for producing the same, an adhesive composed of the same, an adhesive composition containing the same, an adhesive sheet having a layer of the adhesive composition, a method for producing an adhesive article by dissolving the polyether polycarbonate in a solvent selected from water and alcohols having 1 to 4 carbon atoms, coating the solution on an adherend, and volatilizing the solvent, and an alcohol solution containing the polyether polycarbonate.where A represents an alkylene group having 2 to 6 carbon atoms; n represents an average number ranging from 5 to 1,000; and p represents an average number ranging from 5 to 100, wherein (n×p) A's may be the same as or different from one another.