Polyolefin Wax Hot Melt Adhesive for Clean Lyocell Removal
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Solution Overview
Problem
There is a need for a hot melt adhesive composition that exhibits good adhesion properties on a variety of substrate materials, particularly fabrics made from Lyocell fibers, while minimizing residue left on the fabric after removal of hygiene disposable articles.
Innovation Solution
A hot melt adhesive composition comprising 5 to 35% styrene block polymeric component, 40 to 65% tackifying resin, 15 to 40% plasticizer, 3 to 15% polyolefin wax with an enthalpy of crystallization of at least 45 J/g, and optionally 0 to 5% stabilizer, which includes a polyolefin wax grafted with maleic anhydride, provides high peel performance on Lyocell fibers with minimal residue.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional styrene block copolymer hot melt adhesives are used, then adhesion to conventional fabrics is achieved, but adhesion to Lyocell fibers is insufficient and residues remain after removal
Solution Approach 1:
The patent modifies the chemical composition parameters of the hot melt adhesive by incorporating specific components: polyolefin wax (3-15%, particularly polyethylene wax with molecular weight 2000-5000), carboxylic acid-modified polyester resin (40-65%), and styrene block copolymer (5-35%). This parameter optimization enables effective adhesion to Lyocell fibers while preventing residue formation, resolving the contradiction between adhesion reliability and residue generation.
Solution Approach 2:
The patent creates a composite adhesive system combining multiple materials with complementary properties: polyolefin wax provides low-temperature crystallization and flexibility, carboxylic acid-modified polyester resin provides strong bonding to cellulose fibers, and styrene block copolymer provides structural integrity. This composite approach achieves both strong adhesion to Lyocell and clean removal without residues.
2Strength
If hot melt adhesive is applied to ensure strong adhesion during use, then adhesion strength is improved, but residue formation increases after removal
Solution Approach 1:
The patent utilizes the phase transition properties of polyolefin wax, which crystallizes at low temperatures (melting point 50-100°C). During application, the adhesive is heated above the melting point to achieve fluidity and strong bonding. Upon cooling, the wax crystallizes to provide structural support while maintaining the ability to be reheated and removed cleanly, thus achieving both strong adhesion and minimal residue.
Solution Approach 2:
The patent designs the adhesive with polyolefin wax as a key component that can be easily removed after serving its purpose. The wax's low melting point and clean phase transition allow the adhesive to be effectively disposable - it performs its adhesion function reliably during use, then can be completely removed without leaving harmful residues on the fabric.
3Reliability
If adhesive composition is optimized for Lyocell adhesion, then adhesion performance improves, but compatibility with other fabric types may be reduced
Solution Approach 1:
The patent creates a multi-functional adhesive system where each component serves multiple purposes: polyolefin wax provides both flexibility and adhesion to cellulose fibers, carboxylic acid-modified polyester resin provides bonding to both natural and synthetic fibers through its amorphous structure and chemical groups, and styrene block copolymer provides structural integrity across different substrates. This universal formulation achieves effective adhesion to Lyocell, cotton, polyester, and other fabric types.
Solution Approach 2:
The patent employs carboxylic acid-modified polyester resin with specific functional groups that can interact with different fiber types through various mechanisms (hydrogen bonding, dipole interactions, etc.). The amorphous structure of the resin allows it to adapt its local properties to match different substrate characteristics, enabling versatile adhesion while maintaining optimal performance on Lyocell fibers.
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 achieves strong adhesion to Lyocell fibers with minimal residue, suitable for hygiene disposable articles such as adult incontinent products and feminine care products, maintaining adhesion during use and easy removal without leaving residue.
Implementation Method 1
They are applied in the molten state after heating to a temperature generally of between 120 and 250° C., most often between 130 and 180° C., and solidify during cooling, thus forming a seal
Implementation Method 2
They are applied in the molten state after heating to a temperature generally of between 120 and 250° C.
Data Source
AI summary
The invention relates to a hot melt adhesive composition comprising from 5 to 35% by weight of at least one styrene block polymeric component, from 40 to 65% by weight of at least one tackifying resin, from 15 to 40% by weight of at least one plasticizer, from 3 to 15% by weight of at least one polyolefin wax having an enthalpy of crystallization of at least 45 J/g, and from 0 to 5% by weight of at least one stabilizer, based on the total weight of the hot melt adhesive composition. The invention also relates to a process for preparing such a hot melt adhesive composition, to an article comprising such a hot melt adhesive composition and to the use of such a hot melt adhesive composition for adhering a hygiene disposable article on a fabric.