Silylated Polymer Adhesive Accelerates Crosslinking
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Solution Overview
Problem
Current hot-melt pressure-sensitive adhesive compositions require longer crosslinking times, limiting production line speeds and industrial production rates, and can result in self-adhesive articles with optical and physical defects.
Innovation Solution
A multi-component adhesive composition comprising a silylated polymer with hydrolyzable alkoxysilane groups, a tackifying resin, and a catalyst, with specific molecular mass ratios and viscosities, which accelerates crosslinking and improves adhesion properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional hot-melt pressure-sensitive adhesive compositions are used, then the adhesive provides immediate tack and bonding capability, but the crosslinking time is prolonged, limiting production line speeds
Solution Approach 1:
The patent modifies the chemical composition parameters of the adhesive by incorporating silylated polymers with specific alkoxysilane groups and catalyst systems that enable faster crosslinking reactions. This changes the reaction kinetics parameters to achieve quicker curing times while maintaining bonding reliability
Solution Approach 2:
The invention creates a composite adhesive system combining silylated polymers, tackifying resins, and catalyst components that work synergistically. This composite formulation achieves both immediate tack properties and accelerated crosslinking, resolving the contradiction between bonding reliability and production speed
2Reliability
If conventional adhesive compositions with extended crosslinking times are used, then adequate crosslinking is achieved, but self-adhesive articles exhibit optical and physical defects
Solution Approach 1:
The patent employs a fast-acting catalyst system that rushes through the crosslinking reaction quickly, completing the crosslinking process in a short time window. This prevents the formation of defects that would occur with prolonged exposure to crosslinking conditions, thereby improving article quality while maintaining crosslinking completeness
3Productivity
If higher catalyst concentrations are used to accelerate crosslinking, then production rates increase, but the composition stability and adhesion properties may be compromised
Solution Approach 1:
The patent optimizes the catalyst concentration parameter to a specific range that balances reaction speed with composition stability. This parameter optimization ensures rapid crosslinking for high productivity while maintaining stable adhesion properties and preventing degradation from excessive catalyst levels
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 enables faster crosslinking, higher production rates, and reduces defects in self-adhesive articles, enhancing mechanical resistance and adhesion at room and high temperatures.
Implementation Method 1
silylated polymer comprising at least one hydrolyzable alkoxysilane group
Implementation Method 2
hydrolysis and condensation of reactive silane groups advantageously allow the formation of siloxane-type bridges
Implementation Method 3
composition B comprising: at least one catalyst; the mass ratio composition A : composition B ranging from 99.98:0.02 to 60:40
Data Source
Figure 1~2
Figure 3~5
AI summary
The present invention concerns an adhesive multicomponent composition comprising: a composition A comprising: o at least one silylated polymer comprising at least one hydrolysable alkoxysilane group; o at least one tackifying resin; a composition B comprising: o at least one catalyst; o at least one compound C chosen from among: a compound C1 having a number average molecular mass ranging from 300 g/mol to 500,000 g/mol; and a compound C2 having a vapour pressure at 20°C greater than or equal to 0.08 kPa; and mixtures thereof; the mass ratio of composition A:composition B ranging from 99.98:0.02 to 60:40, the total catalyst content ranging from 0.01% to 10% with respect to the total weight of said adhesive composition.