Method for accelerating the curing of adhesives
First Claim
1. A process for curing a thermoplastic or reactive adhesive composition containing a binder and nanoscale particles having superparamagnetic or piezoelectric properties, comprising applying to the adhesive composition an electrical, magnetic or electromagnetic alternating field to effect heating of the composition wherein:
- in the case of thermoplastic adhesives, the adhesive composition is heated beyond the softening point of the thermoplastic binder, orin the case of reactive adhesives, the adhesive composition is heated to a temperature at which the binder matrix is crosslinked via the reactive groups of the binder;
wherein the nanoscale particles have a mean particle size of 3 to 50 nm and the electrical, magnetic or electromagnetic alternating field has a frequency of between 50 kHz and 300 MHz.
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Abstract
A process for heating particle filled adhesive compositions by using an electrical, magnetic or electromagnetic alternating field. Nanoscale particles are employed having ferromagnetic, ferrimagnetic, superparamagnetic or piezoelectric properties. These particles more efficiently convert the electrical, magnetic or electromagnetic input into heat to cure the adhesive composition. With this process not only is the rate of cure accelerated but the various properties of the adhesive are less likely to be adversely affected.
78 Citations
15 Claims
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1. A process for curing a thermoplastic or reactive adhesive composition containing a binder and nanoscale particles having superparamagnetic or piezoelectric properties, comprising applying to the adhesive composition an electrical, magnetic or electromagnetic alternating field to effect heating of the composition wherein:
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in the case of thermoplastic adhesives, the adhesive composition is heated beyond the softening point of the thermoplastic binder, or in the case of reactive adhesives, the adhesive composition is heated to a temperature at which the binder matrix is crosslinked via the reactive groups of the binder;
wherein the nanoscale particles have a mean particle size of 3 to 50 nm and the electrical, magnetic or electromagnetic alternating field has a frequency of between 50 kHz and 300 MHz. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification