Hot Melt Adhesive Composition High Temperature Cohesion
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Solution Overview
Problem
Existing hot melt adhesive compositions for disposable hygiene products face challenges in maintaining adequate peel strength and cohesion performance at high temperatures, particularly in regions with daily temperatures above 50°C, and over extended periods, such as during transport and storage.
Innovation Solution
A hot melt adhesive composition comprising a blend of copolymers with specific needle penetration and enthalpy of crystallization values, along with optional tackifying resins and antioxidants, to enhance initial and long-term peel strength and cohesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional hot melt adhesive compositions are used to achieve strong initial peel strength, then adhesion performance is improved, but cohesion performance deteriorates at high temperatures
Solution Approach 1:
The patent uses a composite adhesive composition combining polyolefin resin (providing adhesion) with polyalphaolefin resin (providing heat-resistant cohesion). This composite approach allows the adhesive to achieve strong initial peel strength while maintaining cohesion performance at high temperatures, resolving the contradiction between adhesion and heat-stable cohesion.
Solution Approach 2:
The patent modifies the chemical composition parameters of the adhesive by incorporating specific ratios of polyolefin resin (30-80 wt%) and polyalphaolefin resin (20-70 wt%), along with controlling molecular weight and crystallinity parameters. This parameter optimization enables simultaneous achievement of strong adhesion and heat-resistant cohesion.
2Strength
If adhesive formulation is optimized for strong bond strength, then adhesion is improved, but processability deteriorates
Solution Approach 1:
The patent optimizes processability by controlling the molecular weight and crystallinity parameters of the polyolefin and polyalphaolefin resins. By adjusting these parameters, the adhesive achieves strong bond strength while maintaining adequate processability for application and bonding operations.
3Object-generated harmful factors
If adhesive composition is optimized for low odor, then odor performance is improved, but cohesion and adhesion balance deteriorates
Solution Approach 1:
The patent achieves low odor performance by selecting polyolefin and polyalphaolefin resins with specific compositional parameters and molecular structures. This parameter selection enables the adhesive to maintain low odor levels while preserving a good balance between cohesion and adhesion properties.
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 composition provides laminates with strong initial peel strength and maintains good cohesion performance over time, even at high temperatures, meeting the demands of disposable hygiene products in various climatic conditions.
Implementation Method 1
hot melt adhesives are typically used because they can be easily applied to substrates (at the molten state) and rapidly develop strong bond upon cooling
Implementation Method 2
hot melt adhesives are typically used because they can be easily applied to substrates (at the molten state)
Data Source
AI summary
The present invention relates to a hot melt adhesive composition having an enthalpy of crystallization below 5 J/g and comprising: a) at least 60% by weight of a composition a) comprising : - at least one copolymer A having a needle penetration higher than 15 dmm; - at least (co)polymer B having a needle penetration lower than 15 dmm; b) from 0% to 30% by weight of at least one tackifying resin.