Metallocene Hot Melt Adhesive for Pressure Sensitive Balance
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Solution Overview
Problem
Existing olefin-based hot melt adhesives are not suitable as pressure sensitive adhesives due to low initial adhesion strength, inadequate holding force, and excessive strength leading to adhesive residue when peeled, making them unsatisfactory for applications requiring balance among initial adhesive strength, holding force, and releasability.
Innovation Solution
A hot melt adhesive comprising a metallocene based propylene homopolymer, a metallocene based ethylene/α-olefin copolymer, a tackifier resin, and a plasticizer, specifically including naphthene oil and polybutene, which balances initial adhesive strength, holding force, and releasability, preventing adhesive residue.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If olefin-based hot melt adhesives are used, then cost and flexibility are improved, but initial adhesive strength and holding force are insufficient
Solution Approach 1:
The patent uses a composite adhesive system combining metallocene-based propylene homopolymer, metallocene-based ethylene/α-olefin copolymer, tackifier resin, and plasticizer. This composite formulation achieves both cost-effectiveness and sufficient initial adhesive strength by leveraging the synergistic effects of multiple components working together.
Solution Approach 2:
The patent optimizes specific parameters including the molecular weight distribution of the propylene homopolymer (Mw/Mn ≤ 3.0), the ratio of copolymer to homopolymer (50:50 to 90:10 by weight), and the type of plasticizer used. These parameter changes enable the adhesive to achieve adequate initial strength while maintaining cost-effectiveness.
2Ease of manufacture
If olefin-based hot melt adhesives are used, then cost and flexibility are improved, but holding force is insufficient
Solution Approach 1:
The composite formulation including metallocene-based propylene homopolymer, metallocene-based ethylene/α-olefin copolymer, tackifier resin, and plasticizer creates a synergistic system that maintains holding force over time while remaining cost-effective. The specific combination of components ensures long-term performance without requiring expensive additives.
Solution Approach 2:
The patent specifies precise parameter ranges including the molecular weight distribution (Mw/Mn ≤ 3.0), copolymer content (50-90 parts by weight), and plasticizer selection to ensure adequate holding force. These controlled parameter changes enable the adhesive to maintain performance over time at reasonable cost.
3Object-affected harmful factors
If olefin-based hot melt adhesives are used, then environmental benefits are improved, but adhesive residue occurs when peeled
Solution Approach 1:
The patent adjusts key parameters including the molecular weight distribution of the propylene homopolymer (Mw/Mn ≤ 3.0), the ratio of copolymer to homopolymer (50:50 to 90:10 by weight), and plasticizer type to achieve optimal peel characteristics. These parameter changes enable clean removal without residue while maintaining environmental benefits of solvent-free formulation.
4Strength
If metallocene based propylene homopolymer with specific molecular weight distribution is used, then initial adhesive strength is improved, but formulation complexity increases
Solution Approach 1:
The patent specifies a clear parameter range for the propylene homopolymer molecular weight distribution (Mw/Mn ≤ 3.0) and establishes defined ratios for copolymer to homopolymer (50:50 to 90:10 by weight). These concrete parameter specifications simplify the formulation process while ensuring adequate initial adhesive strength, avoiding excessive complexity.
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 adhesive achieves excellent initial adhesion, sufficient holding force, and easy peelability without residue, making it suitable for use as a pressure sensitive adhesive in various applications.
Implementation Method 1
The hot melt adhesive comprises (A) a metallocene based propylene homopolymer, (B) a metallocene based ethylene/α-olefin copolymer
Implementation Method 2
metallocene based propylene homopolymer, a metallocene based ethylene/α-olefin copolymer, a tackifier resin, and a plasticizer
Implementation Method 3
a tackifier resin, and a plasticizer, wherein the plasticizer (D) comprises (D1) an oil and (D2) at least one polymer selected from polybutene, polybutadiene, polyisobutylene, and polyisoprene
Implementation Method 4
a plasticizer, specifically including naphthene oil and polybutene, which balances initial adhesive strength, holding force, and releasability
Data Source
AI summary
Disclosed is a hot melt adhesive comprising: (A) a metallocene based propylene homopolymer, (B) a metallocene based ethylene/α-olefin copolymer, (C) a tackifier resin, and (D) a plasticizer, wherein the plasticizer (D) comprises (D1) an oil and (D2) at least one polymer selected from polybutene, polybutadiene, polyisobutylene, and polyisoprene. This hot melt adhesive has an initial adhesive strength enough to enable a pressure sensitive adhesion body to stick easily on a member, thus making it possible to firmly hold the pressure sensitive adhesion body on the member. The hot melt adhesive is also excellent in releasability, thus causing no adhesive residue on the member when the pressure sensitive adhesion body is peeled from the member.