Silane Polymer Adhesion to PVC Without Primer
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Solution Overview
Problem
Existing silane-functional polymer compositions, such as those described in EP2098548B1, face limitations in adhesion to plastics like PVC without the use of a primer, necessitating an improvement in their bonding capabilities.
Innovation Solution
A composition combining a silane-functional polymer with an ethoxymercaptosilane, a specific catalyst (organotitanate, organozirconate, or organoaluminate), and a base, which enhances adhesion to plastics, particularly PVC, without the need for a primer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a silane-functional polymer composition is used without a primer, then the application process is simplified and productivity is improved, but the adhesion to plastics such as PVC is insufficient
Solution Approach 1:
The patent changes the chemical parameters of the composition by introducing ethoxymercaptosilane (specifically 3-mercaptopropyldiethoxymethylsilane) alongside the organotitanate catalyst. This chemical parameter change enables the composition to achieve strong adhesion to plastics without requiring a primer, thus resolving the contradiction between application efficiency and adhesion strength.
Solution Approach 2:
The patent creates a composite chemical system combining silane-functional polymer, ethoxymercaptosilane, and organotitanate catalyst. This composite material approach synergistically improves adhesion to plastic substrates while maintaining the primerless application advantage, effectively resolving the technical contradiction.
2Strength
If an organotitanate catalyst is used for crosslinking, then the adhesion to plastics is improved, but the composition requires additional components increasing complexity
Solution Approach 1:
The patent merges multiple functions into a single integrated system where the organotitanate catalyst serves both as a crosslinking catalyst and an adhesion promoter. The ethoxymercaptosilane component simultaneously provides crosslinking functionality and enhances plastic adhesion. This merging reduces the need for separate adhesion promoters, thereby limiting the increase in composition complexity while achieving improved adhesion strength.
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 combination significantly improves the adhesion of the silane-functional polymer composition to plastics, including PVC, by crosslinking and promoting primerless bonding, thereby enhancing the composition's adhesive properties.
Implementation Method 1
at least one catalyst for the crosslinking of silane-functional polymers selected from the group consisting of an organotitanate, organozirconate and organoaluminate
Implementation Method 2
Silanes, or rather their silane groups, have the property of hydrolyzing upon contact with moisture. This process forms organosilanols, that is, organosilicon compounds containing one or more silanol groups (Si-OH groups), and, through subsequent condensation reactions, organosiloxanes
Implementation Method 3
through subsequent condensation reactions, organosiloxanes, that is, organosilicon compounds containing one or more siloxane groups (Si-O-Si groups)
Implementation Method 4
By combining an ethoxymercaptosilane with a specific catalyst and a base in a composition based on a silane-functional polymer, the adhesion of such a composition, particularly to plastics and especially to PVC, can be improved
Data Source
AI summary
The present invention relates to a composition comprising - at least one silane-functional polymer P. - at least one catalyst for the cross-linking of silane-functional polymers, selected from the group consisting of an organotitanate, organozirconate and organoaluminate; - at least one base; and - at least one ethoxy mercaptosilane. Such compositions are suitable as adhesives, sealants or as coatings, in particular for plastics, preferably for PVC.as