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US 2013/0172480 A1Published application
Functional materials having a controllable viscosity or reversible crosslinking via aza diels-alder reactions with bishydrazones or conjugated bis-schiff bases
AssigneeEvonik Roehm GmbH
InventorsFriedrich Georg Schmidt, Stefan Hilf, Christopher Barner-Kowollik, Jiawen Zhou
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Abstract
The present invention relates to innovative materials which are reversibly crosslinkable by means of a thermoreversible mechanism and/or whose viscosity is reversibly adjustable. Through the use of bishydrazones or conjugated bis-Schiff bases as diene components in aza-Diels-Alder reactions, functional materials are generated that feature controllable viscosity and/or reversible crosslinking.
Claims16
A formulation, comprising:
- a component A which comprises at least two dienophilic double bonds, and
- a component B which comprises at least two diene functionalities, with at least one of the diene functionalities comprising two carbon-nitrogen double bonds,
- wherein
- the formulation is crosslinkable via an aza-Diels-Alder reaction, and couplable or crosslinkable at room temperature, and
- a coupling or crosslinking in the formulation is reversible to an extent of at least 50% at a higher temperature.
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A process for reversible crosslinking, the process comprising:
- crosslinking a formulation comprising at least two different components A and B via an aza-Diels-Alder reaction at room temperature to form crosslinks;
- and
- uncrosslinking at least 50% of the crosslinks via a retro-aza-Diels-Alder reaction at a higher temperature,
- wherein a diene partaking in the aza-Diels-Alder reaction comprises two carbon-nitrogen double bonds.
1 more element
Dependencies are inferred from the claim text.