Acrylate Skin-Adhesive Composition for Absorbent Articles
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Solution Overview
Problem
Current skin-adhesive compositions for absorbent articles lack sufficient adhesion strength while being gentle on the skin, and they fail to provide effective skin care benefits, particularly in areas with high sweat and fluid exposure.
Innovation Solution
A skin-adhesive composition combining an acrylate-based adhesive with an adhesion modifier, such as Polytrap or Poly-Pore, which enhances bonding strength to substrates while remaining gentle on the skin and allows for the delivery of skin benefit agents like antiperspirants and moisturizers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional skin-adhesive compositions are used, then the adhesive can be applied to the substrate, but the adhesion strength is insufficient and the bonding is not durable
Solution Approach 1:
The patent uses a composite adhesive system combining acrylate-based adhesive with adhesion promoters (silane-modified polymers) and optional rubber particles. This multi-component composite formulation achieves both high adhesion strength through chemical bonding mechanisms and durable reliability through the synergistic effects of different material phases, resolving the contradiction between initial bond strength and long-term bonding durability.
Solution Approach 2:
The patent modifies the adhesive parameters by adjusting the acrylate monomer composition, crosslinking density, and adhesion promoter concentration. These parameter changes optimize the balance between adhesion strength (through increased chemical bonding) and bonding durability (through controlled flexibility and moisture resistance), allowing the adhesive to perform reliably under varying physiological conditions.
2Strength
If stronger adhesive formulations are used to improve bonding, then adhesion strength increases, but skin irritation and gentleness deteriorate
Solution Approach 1:
The patent introduces adhesion promoters (silane-modified polymers) as intermediary substances between the acrylate adhesive and the skin substrate. These intermediaries provide strong chemical bonding to achieve high adhesion strength while being biocompatible and non-irritating to skin, thus resolving the contradiction between bond strength and skin gentleness by mediating the interaction through a third component.
Solution Approach 2:
The adhesive formulation exhibits local quality differentiation where the acrylate-based component provides strong bonding at the interface, while the adhesion promoter and optional softening agents provide skin-friendly properties at the skin-contact surface. This spatial and functional differentiation allows strong adhesion without skin irritation.
3Strength
If the adhesive provides strong bonding to substrate, then attachment strength is improved, but bonding to skin becomes too strong and difficult to remove
Solution Approach 1:
The adhesive system is designed with local quality differentiation where the acrylate component provides strong, durable bonding to the substrate (diaper/underwear) while the adhesion promoter and plasticizer components create a softer, more compliant interface with the skin that allows for gentle removal. This spatial differentiation of bonding characteristics resolves the contradiction between strong substrate attachment and easy skin removal.
Solution Approach 2:
The adhesive formulation incorporates plasticizers and flexible polymer chains that provide dynamic characteristics - maintaining strong bond strength under normal wear conditions while allowing the adhesive to deform and release gently during removal. This dynamic behavior enables the adhesive to adapt between strong bonding and easy removal states.
4Ease of operation
If the adhesive is designed for personal care applications with lower bonding strength, then ease of removal is improved, but adhesion strength and reliability deteriorate
Solution Approach 1:
The patent employs a composite adhesive system where the acrylate-based adhesive provides reliable adhesion strength, while the adhesion promoter and plasticizer components ensure ease of removal. This composite formulation achieves both adhesion reliability and ease of operation through the synergistic combination of multiple functional components, resolving the contradiction between strong reliable bonding and easy removal.
Solution Approach 2:
The adhesive parameters are precisely controlled - the acrylate monomer composition and crosslinking density are optimized to provide sufficient adhesion reliability, while the adhesion promoter concentration and plasticizer content are adjusted to ensure easy removal. These parameter optimizations resolve the contradiction by finding the precise balance point where both adhesion reliability and ease of operation are satisfied.
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 improved adhesion to both skin and substrates, maintaining strength without causing skin irritation and offering additional skin care benefits, ensuring effective fluid management and comfort during use.
Implementation Method 1
The skin-adhesive composition comprises an acrylate-based adhesive and an adhesion modifier
Implementation Method 2
the adhesion modifier can allow the adhesive to maintain its bonding strength with the substrate and have improved bonding strength with the skin
Data Source
AI summary
Improved skin-adhesive compositions for bonding a substrate, such as an absorbent article, to skin are disclosed. More particularly, the skin-adhesive composition has an improved, yet gentle, adhesion to the skin of a user, while maintaining strong, effective bonding to various inanimate, non-skin substrates. In one embodiment, the skin-adhesive composition can provide one or more skin benefit agents to the user. The skin-adhesive composition may applied to an absorbent article, such as a panty-liner, sanitary napkin, or an incontinence article, for directly adhering the article to the skin of a user.