Alternating Silicone and Organic Adhesive Stripes for Humidity-Resistant Bonding
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Solution Overview
Problem
Existing stretch-releasable pressure-sensitive adhesive tapes struggle to maintain adhesion and resistance to shear forces, especially when exposed to elevated humidity and bonded to surfaces with polar moieties, such as architectural paints, without leaving residue upon removal.
Innovation Solution
A primary adhesive layer comprising alternating stripes of silicone-based and organic polymeric pressure-sensitive adhesives, with the silicone-based adhesive providing a volume fraction of 11% to 80% and exhibiting an Elevated Humidity / Static Shear Test result of >30000 minutes, is applied on a fluorosilicone release liner, ensuring effective bonding and stretch-releasability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single adhesive composition is used in stretch-releasable tapes, then the adhesive can be easily applied and manufactured, but the adhesion strength and resistance to shear forces under elevated humidity are insufficient
Solution Approach 1:
The adhesive layer is constructed as a composite of multiple adhesive compositions with different properties (silicone-based adhesive for stretch-releasability and organic polymeric adhesive for adhesion strength). This composite structure allows the tape to simultaneously achieve strong bonding, resistance to shear forces under elevated humidity, and easy stretch-releasability, resolving the contradiction between reliability and simplicity by combining materials with complementary characteristics.
Solution Approach 2:
The adhesive layer is divided into multiple discrete adhesive compositions rather than using a single uniform adhesive. This segmentation allows each adhesive type to perform its specialized function (one providing stretch-releasability, another providing adhesion strength), thereby improving overall reliability while managing complexity through functional division.
2Ease of operation
If the adhesive tape is stretched for release, then the tape can be removed from the surface, but maintaining adhesion during stretching and preventing residue upon removal is challenging
Solution Approach 1:
The combination of silicone-based adhesive (providing stretch-releasability) and organic polymeric adhesive (providing adhesion strength) creates a composite system where the silicone component allows easy stretching and clean removal while the organic component maintains strong bonding during the process, preventing residue and ensuring reliable adhesion throughout the stretch-release cycle.
3Strength
If the adhesive is designed for strong bonding to polar surfaces like architectural paints, then adhesion strength improves, but resistance to shear forces under elevated humidity decreases
Solution Approach 1:
The organic polymeric adhesive provides strong bonding to polar surfaces through its chemical affinity, while the silicone-based adhesive component contributes hydrophobic properties that resist moisture penetration and maintain shear force resistance under elevated humidity. This composite approach allows both bonding strength and humidity resistance to coexist.
Solution Approach 2:
Different regions or components of the adhesive layer have specialized properties: the organic polymeric adhesive is optimized for bonding to polar surfaces, while the silicone-based adhesive is optimized for moisture resistance and stretch-releasability. This local specialization allows the overall adhesive system to achieve both strong bonding and reliable shear resistance in humid conditions.
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 solution provides a stretch-releasable adhesive tape that maintains adhesion and resistance to shear forces for extended periods, even under elevated humidity conditions, while allowing easy removal without residue, and can be oriented with stripes perpendicular to the shear force, enhancing bonding to surfaces like architectural paints.
Implementation Method 1
a first release liner comprising a fluorosilicone release surface on at least a first major surface thereof
Implementation Method 2
the first pressure-sensitive adhesive is a silicone-based pressure-sensitive adhesive that comprises a silicone block copolymer elastomer comprising hard segments that each comprise at least one polar moiety
Implementation Method 3
the primary adhesive layer comprises a plurality of stripes of a first pressure-sensitive adhesive and of a second pressure-sensitive adhesive, arranged in an alternating pattern across a lateral extent of the release liner
Implementation Method 4
the tape backing is a highly extensible backing that, when stretched along its long axis, achieves an elongation of at least 150% without rupture or breakage
Implementation Method 5
silicone block copolymer elastomer comprising hard segments that each comprise at least one polar moiety
Data Source
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AI summary
An article including a release liner with an adhesive layer disposed thereon, the adhesive layer including a plurality of stripes of a first pressure-sensitive adhesive and of a second pressure-sensitive adhesive, arranged in a generally alternating pattern. The first pressure-sensitive adhesive is a silicone-based pressure-sensitive adhesive that includes a silicone block copolymer elastomer comprising hard segments that each comprise at least one polar moiety, and the second pressure-sensitive adhesive is an organic polymeric pressure-sensitive adhesive.