Olefin Copolymer Adhesive for Absorbent Articles
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Solution Overview
Problem
Existing hot melt adhesive compositions for absorbent and textile articles face challenges with high costs, processing difficulties, and equipment damage due to cured adhesive residuals, which require frequent maintenance and are not cost-effective or easily processable.
Innovation Solution
A copolymer-based adhesive composition comprising 30-70 wt.% propene and 30-70 wt.% 1-butene monomer units, with specific viscosity, storage modulus, and yield stress properties, minimizing the use of tackifiers and heterophase polymers to improve processability and reduce costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If olefin-based hot melt adhesives are formulated with good bonding properties, then bonding reliability is improved, but processing difficulty increases and equipment damage occurs due to cured adhesive residuals
Solution Approach 1:
The patent modifies the chemical composition parameters of the adhesive by incorporating specific copolymers with controlled monomer ratios (ethylene 10-40%, propylene 30-60%, 1-butene 10-40%) and limiting tackifier content to 0-20 wt%. This parameter optimization allows the adhesive to maintain strong bonding properties while reducing cured residual accumulation on equipment, thereby resolving the contradiction between bonding reliability and processing ease
Solution Approach 2:
The invention creates a composite adhesive system combining multiple polymer components (ethylene/propylene/1-butene copolymers) with controlled amounts of tackifiers and plasticizers. This composite formulation achieves synergistic effects where the copolymer matrix provides reliable bonding while the specific composition ratio prevents excessive curing on equipment surfaces, simultaneously improving both bonding reliability and manufacturability
2Strength
If tackifiers are increased to improve adhesive performance, then bonding strength is improved, but cost increases and sourcing difficulty increases
Solution Approach 1:
The patent optimizes the tackifier content parameter within a specific range (0-20 wt%) rather than using high concentrations. This controlled parameter approach achieves sufficient bonding strength through the synergistic interaction of copolymer components while significantly reducing dependency on expensive and difficult-to-source tackifier materials, thereby improving both bonding strength and sourcing ease
3Quantity of substance
If adhesive composition is simplified to reduce cost, then material cost is reduced, but bonding performance and processability may be compromised
Solution Approach 1:
The invention develops a multi-component composite adhesive system where ethylene/propylene/1-butene copolymers work synergistically with controlled tackifier and plasticizer content. This composite formulation achieves high bonding performance and reliable adhesion while optimizing material usage efficiency, demonstrating that cost reduction through simplified composition does not necessarily compromise performance when proper composite design is implemented
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 composition offers improved bonding performance, reduced equipment maintenance, and lower costs by providing robust bonds with lower adhesive mass usage, enhancing the mechanical properties and durability of laminates while maintaining compatibility with application equipment.
Implementation Method 1
Adhesive compositions such as hot melt adhesive compositions are a type of adhesive that is applied in molten form onto parts to be adhesively bonded, before setting and solidifying upon cooling
Implementation Method 2
adhesive compositions such as hot melt adhesive compositions are a type of adhesive that is applied in molten form
Implementation Method 3
applied in molten form onto parts to be adhesively bonded, before setting and solidifying upon cooling
Data Source
AI summary
Described herein is an adhesive composition including a copolymer. The adhesive composition has a viscosity of from about 2,000 mPa⋅s to about 11,500 mPa⋅s at 150 °C. The adhesive composition has a Storage Modulus at 37 °C of from about 3 MPa to 9.5 MPa. The adhesive composition has a Yield Stress at 37 °C of from about 0.8 MPa to about 1.45 MPa.