Propylene-Based Polymer Composition for Pressure-Sensitive Adhesives
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Solution Overview
Problem
Propylene-based polymers used as pressure-sensitive adhesives often contaminate adherends over long periods and have poor pellet handling properties, leading to blocking issues and reduced adhesion performance.
Innovation Solution
Developing propylene-based polymers with a specific composition of 65-80 mol% propylene, 5-10 mol% ethylene, and 15-25 mol% C4-20 α-olefin units, which exhibit a heat of crystal fusion of 5-45 J/g, high triad tacticity, and suitable crystallinity, along with propylene-based polymer compositions that improve adhesion and prevent contamination when used as pressure-sensitive adhesives.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If propylene-based polymer is used as pressure-sensitive adhesive, then initial adhesion is achieved, but contamination occurs over long term
Solution Approach 1:
The patent changes the compositional parameters of the propylene-based polymer by incorporating specific amounts of ethylene (5-10 mol%) and C4-20 α-olefin (15-25 mol%) units, and controlling the heat of crystal fusion (5-45 J/g). This parameter optimization resolves the contradiction by achieving both good initial adhesion and long-term non-contamination performance.
Solution Approach 2:
The patent creates a composite propylene-based polymer structure containing multiple monomer units (propylene, ethylene, and C4-20 α-olefin) with specific compositional ratios. This composite structure combines the adhesive properties of propylene with the flexibility and stability provided by ethylene and α-olefin copolymer units, resolving the contradiction between initial adhesion and long-term non-contamination.
2Reliability
If propylene-based polymer is used as pressure-sensitive adhesive, then adhesion performance is achieved, but pellet handling properties deteriorate due to blocking
Solution Approach 1:
The patent optimizes the thermal parameters of the polymer by controlling the heat of crystal fusion to 5-45 J/g through specific copolymer composition. This parameter change prevents pellet blocking during storage and handling while maintaining the adhesion performance required for pressure-sensitive adhesive applications.
3Ease of operation
If propylene-based polymer with high crystallinity is used, then handling properties improve, but adhesion performance deteriorates
Solution Approach 1:
The patent precisely controls the heat of crystal fusion parameter to 5-45 J/g through optimized copolymer composition (65-80 mol% propylene, 5-10 mol% ethylene, 15-25 mol% C4-20 α-olefin). This parameter optimization achieves the balance between handling properties and adhesion performance by preventing both pellet blocking and adhesion failure.
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 propylene-based polymers and compositions demonstrate excellent handling properties, preventing blocking and maintaining desired initial adhesion over long periods, making them suitable for surface protection films and enhancing the pressure-sensitive adhesion of other thermoplastic resins or elastomers.
Implementation Method 1
the propylene-based polymer (A) has a heat of crystal fusion of 5 to 45 J/g as measured by DSC
Implementation Method 2
the propylene-based polymer (A) has a heat of crystal fusion of 5 to 45 J/g as measured by DSC
Data Source
AI summary
Propylene-based polymers (A) are provided which, when used as pressure-sensitive adhesives to various adherends, show a desired initial adhesion and will not contaminate the adherends and which have excellent pellet handling properties. Pellets of the invention contain the propylene-based polymers (A). Pressure-sensitive adhesives of the invention contain the propylene-based polymers (A). The propylene-based polymer (A) includes 65 to 80 mol % of a structural unit derived from propylene, 5 to 10 mol % of a structural unit derived from ethylene and 15 to 25 mol % of a structural unit derived from a C4-20 α-olefin (wherein these percentages are calculated based on 100 mol % of the total of the structural unit derived from propylene, the structural unit derived from ethylene and the structural unit derived from a C4-20 α-olefin) and has a heat of crystal fusion of 5 to 45 (J/g) as measured by DSC. Compositions of the invention contain the propylene-based polymers (A).