Pressure Sensitive Adhesive Composition for Protective Films
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Solution Overview
Problem
Existing pressure sensitive adhesive compositions for protective films often leave residues on surfaces due to high plasticizer content, and they aim to balance high peel adhesion with good processability while minimizing the use of inexpensive polyolefins that do not contribute to desirable properties.
Innovation Solution
A pressure sensitive adhesive composition comprising a block copolymer with poly(monovinyl aromatic hydrocarbon) and hydrogenated poly(conjugated diene) blocks, combined with optional tackifying resin, polyolefin, plasticizer, and antioxidant, optimized to achieve high peel adhesion and melt flow rate, with specific molecular weight and hydrogenation degree specifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If large amounts of plasticizing oils are used in the adhesive composition, then the adhesive properties and processability are improved, but residues are left on the surface to be protected after film removal
Solution Approach 1:
The patent removes plasticizing oils from the adhesive composition entirely, extracting the harmful component that causes surface residues while maintaining adhesive performance through alternative formulation components
Solution Approach 2:
The patent changes the chemical composition parameters of the adhesive by eliminating plasticizers and adjusting the ratios of block copolymer, tackifying resin, and polyolefin to achieve the desired balance between adhesion and residue-free performance
2Quantity of substance
If large amounts of polyolefin are used in the adhesive composition, then the cost is reduced, but the desirable adhesive properties and processability are compromised
Solution Approach 1:
The patent optimizes the polyolefin content parameter to a specific range (5-50 parts per 100 parts block copolymer) and adjusts other composition parameters (tackifying resin 20-80 parts, plasticizer 0-40 parts) to maintain desirable adhesive properties while controlling cost
Solution Approach 2:
The patent creates a composite adhesive system combining block copolymer, tackifying resin, polyolefin, and plasticizer in specific proportions, where each component contributes specific properties that complement each other to achieve overall optimal performance
3Strength
If the vinyl content of the block copolymer is increased, then the adhesive strength is improved, but the cost and complexity of the composition increases
Solution Approach 1:
The patent specifies a preferred vinyl content range of 70-80 wt% in the block copolymer to achieve optimal peel adhesion while controlling composition complexity through defined parameter ranges
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 provides protective films with high peel adhesion and suitable processability while minimizing residue issues and polyolefin content, ensuring effective adhesion and ease of processing.
Implementation Method 1
a pressure sensitive adhesive composition comprising a block copolymer containing at least two poly(monovinyl aromatic hydrocarbon) blocks and at least one hydrogenated poly(conjugated diene) block
Data Source
AI summary
Protective film in the form of a tape or sheet comprising a substrate layer and a pressure sensitive adhesive composition.