Processes for producing viscous epoxy syrups
AssigneeTesa SE
InventorsChristian Schuh, Klaus Keite-Telgenbüscher, Yao Shu
Life of this patent
Estimating the term…
Abstract
A process for producing a viscous epoxy syrup from at least one liquid multifunctional epoxy, comprising the steps of: adding an initiator selected from the group consisting of electron-poor monoisocyanate, photoinitiator and thermal initiator to at least one liquid multifunctional epoxy; mixing the components; polymerizing the multifunctional epoxy such that the viscosity of the resulting epoxy syrup is at least twice as high, preferably at least four times as high and in particular at least ten times as high as the viscosity of the employed epoxy in the unreacted state makes it possible to produce epoxy adhesives having pressure-sensitive properties.
Claims16
Process for producing an epoxy adhesive comprising:
- providing an at least one liquid multifunctional epoxy;
- adding to the at least one liquid multifunctional epoxy an initiator selected from the group consisting of an electron-poor monoisocyanate, a photoinitiator, and a thermal initiator;
- mixing the at least one liquid multifunctional epoxy and the initiator;
- cationically polymerizing the at least one liquid multifunctional epoxy, thereby forming an epoxy syrup comprising an at least one uncrosslinked polyepoxy;
- and
- mixing the epoxy syrup with further components to form an epoxy adhesive,
- wherein:
- a viscosity of the epoxy syrup is at least twice as high as a viscosity of the at least one liquid multifunctional epoxy before the addition of the initiator;
- and
- the cationic polymerization is stopped upon reaching a desired viscosity by the addition of an initiator scavenger.
Dependencies are inferred from the claim text.