Crosslinked Filled Polyisobutene Adhesives for Shear and Polar Adhesion
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Solution Overview
Problem
Existing polyisobutene-based pressure sensitive adhesives (PSAs) lack sufficient static shear strength, creep resistance, and adhesion to polar surfaces, and do not effectively provide electrical conductivity or moisture barrier properties.
Innovation Solution
The development of filled polyisobutene-based PSAs with a crosslinked structure using surface-treated fillers, such as silane or silazane-treated silica and alumina, and crosslinking agents like SiH, SH, or isocyanate functional agents, to enhance adhesion, static shear strength, and conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional polyisobutene-based PSAs are used, then the adhesive composition is simple and easy to manufacture, but the static shear strength is insufficient
Solution Approach 1:
The patent applies composite materials by combining polyisobutene resin with surface-treated filler particles (silica, alumina, or titania treated with silane or silazane) and crosslinking agents. This composite structure provides enhanced static shear strength while maintaining processability, directly resolving the contradiction between strength improvement and composition complexity.
Solution Approach 2:
The patent changes the chemical parameters of the adhesive system by introducing crosslinking agents (such as polyfunctional silanes, isocyanates, or carboxylic acids) that react with surface-treated fillers to form crosslinked networks. This parameter change transforms the physical adhesive into a chemically crosslinked system, dramatically improving static shear strength without excessive complexity increase.
2Stability of the object's composition
If conventional polyisobutene-based PSAs are used, then the formulation is simple, but the creep resistance is insufficient
Solution Approach 1:
The patent changes the rheological parameters of the adhesive by forming a crosslinked network structure through reactions between crosslinking agents and surface-treated fillers. This crosslinking transforms the viscous adhesive into a more stable, elastic material with significantly improved creep resistance, while the formulation remains practically manageable.
Solution Approach 2:
The composite structure of crosslinked polymer-filler networks provides dimensional stability and creep resistance. The rigid filler particles embedded in the crosslinked polyisobutene matrix resist deformation under sustained load, resolving the contradiction between creep resistance and formulation complexity.
3Strength
If conventional polyisobutene-based PSAs are used, then the adhesive is easy to apply, but the adhesion to polar surfaces is insufficient
Solution Approach 1:
The patent changes the surface energy parameters of the adhesive by incorporating surface-treated fillers with polar groups (from silane or silazane treatment) and crosslinking agents that form polar interactions. These chemical modifications enable strong adhesion to polar surfaces like metals and glasses, overcoming the inherent non-polar nature of polyisobutene without excessive complexity.
Solution Approach 2:
The composite system combines non-polar polyisobutene with polar surface-treated fillers and crosslinked networks. This creates an adhesive that maintains the processability of polyisobutene while gaining polar adhesion capabilities through the filler and crosslinking components, resolving the contradiction between adhesion strength and composition complexity.
4Adaptability or versatility
If conventional polyisobutene-based PSAs are used, then the formulation is simple, but electrical conductivity and moisture barrier properties are not provided
Solution Approach 1:
The patent creates a multi-functional composite material where surface-treated fillers (particularly conductive variants like carbon-black-filled or metal-oxide-filled silicas) and crosslinked networks simultaneously provide structural integrity, moisture barrier properties, and electrical conductivity. This composite approach delivers multiple functions without proportionally increasing formulation complexity.
Solution Approach 2:
The crosslinked adhesive system achieves multi-functionality: the polyisobutene provides baseline adhesion and flexibility, surface-treated fillers provide polarity enhancement and conductivity, and the crosslinked network provides moisture barrier and mechanical stability. This universal formulation satisfies multiple performance requirements simultaneously, resolving the contradiction between functional versatility and formulation complexity.
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 filled PSAs exhibit improved static shear strength, reduced creep, adhesion to polar surfaces, and provide electrical conductivity and moisture barrier properties, making them suitable for adhesive tapes and barrier adhesives.
Implementation Method 1
a crosslinking agent comprising at least two moieties that will react with, at least, the ST filler and/or the NST filler
Implementation Method 2
a crosslinking agent comprising at least two moieties that will react with, at least, the ST filler and/or the NST filler
Implementation Method 3
a crosslinking catalyst; and a catalytic inhibitor
Implementation Method 4
provide electrical conductivity
Implementation Method 5
provide moisture barrier properties
Data Source
AI summary
Filled polyisobutene-based (PIB) pressure sensitive adhesives (PSA) comprising a crosslinked structure therein. Compositions for preparing the PSAs comprise a PIB resin, a surface-treated and/or non-surface treated filler, wherein the surface treatment comprises a silane, a silazane or a combination thereof, and a SiH, SH or isocyanate functional crosslinking agent. Related embodiments include methods for preparing and using the filled PSAs, e.g., barrier adhesives and as a component of an adhesive tape.