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Induktiv haertbare und wieder loesbare Verbindungen

Curable, polymer-based adhesive composition, e.g. for adhesives and casting resins contains filler particles with chemically-bonded crosslinker units, which can be heated inductively, e.g. by an electromagnetic field.
 
: Hartwig, A.; Born, E.; Kolbe, J.; Kowalik, T.; Popp, M.; Sebald, M.; Schorsch, O.

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Frontpage ()

DE 2001-10155614 A1: 20011113
DE 2002-10210661 A: 20020312
WO 2002-EP12610 A: 20021112
DE 10210661 A1: 20030528
C09J0009
C09J0011
German
Patent, Electronic Publication
Fraunhofer IFAM ()

Abstract
Die Erfindung betrifft eine Klebstoffzusammensetzung zur Herstellung von Duromeren, die mittels eines elektrischen Feldes, magnetischen Feldes, elektromagnetischen Feldes, elektrischen Wechselfeldes, magnetischen Wechselfeldes oder elektromagnetischen Wechselfeldes erwaermbar ist, und die Fuellstoffpartikel, die metallisch, ferromagnetisch, ferrimagnetisch, superparamagnetisch oder paramagnetisch sind, enthaelt. Die Klebstoffzusammensetzung kann durch induktive Erwaermung zu einer bestaendigen adhaesiven Verbindung mit hoher Festigkeit gehaertet werden und die adhaesiven Verbindungen koennen durch induktive Erwaermung auch wieder geloest werden.

 

WO2003042315 A UPAB: 20030716 NOVELTY - Ferromagnetic, ferrimagnetic, super-paramagnetic or paramagnetic filler particles with chemically-bonded crosslinker units are used as crosslinkers in polymer-based adhesive compositions for the production of thermosets, which are heated by means of electric, magnetic or electromagnetic fields. DETAILED DESCRIPTION - An adhesive composition (I) for the production of thermosets, which can be heated by means of an electric or optionally alternating magnetic or electromagnetic field, contains a polymer, a polymer mixture or a reaction resin and crosslinker particles (II) consisting of ferromagnetic, ferrimagnetic, super-paramagnetic or paramagnetic filler particles with chemically-bonded crosslinker units. INDEPENDENT CLAIMS are also included for the following: (1) a method for curing (I) by inductive heating to the crosslinking temperature, using electric/magnetic fields as above; (2) adhesive bonds with at least one layer of adhesive obtained by curing (I); (3) methods for the thermal loosening of such bonds by heating with electric/magnetic fields etc. (as above) to a temperature above the ceiling temperature of the crosslinking points or to a temperature at which the thermally-labile bonds of a thermally-labile compound or groups break. USE - In adhesives, varnish, sealing materials, primers, matrix resins or casting resins (claimed). Also claimed is the use for stripping paint (especially in aircraft and ship construction) of methods for loosening the hardened adhesive bonds by heating with an electric/magnetic field to above the crosslink ceiling temperature or to a temperature at which the thermally-labile bonds break. ADVANTAGE - An adhesive composition which can be cured under mild conditions (by the inductive heating of filler particles) to form stable, high-strength bonds which can be rapidly loosened again by inductive heating without the addition of release agents and without decomposition of the entire polymer.

: http://publica.fraunhofer.de/documents/PX-88464.html