The reactive hot-melt adhesives on the basis of polyurethane and polyolefin are becoming increasingly important.
They enable constructive bonds to be achieved.
The principle behind these moisture-curing hot-melt adhesives is a two-stage setting mechanism. After the reactive PUR hot melt has been applied, it first sets physically, giving the bond a handling strength.
In the second step, the adhesive reacts chemically with the available humidity to form high molecular weight polymers with high cohesion. The speed of the reaction depends on the available humidity.
In this way, exceptionally high temperature resistance can be achieved, with good flexibility at low temperatures and resistance to a large number of chemicals. Standard PUR hot melts with an MDI content > 0.1 % are subject to labelling.
Another group in the field of reactive hot-melt adhesives are the formulations based on silane-modified polyolefins. These are distinguished from PUR hot melts in particular by the fact that a bonding of non-pretreated polypropylene is possible. In addition, they do not contain any isocyanates and are therefore not subject to labelling. The cohesive properties, on the other hand, are below those of polyurethane-based adhesives.
Your advantages when using reactive PUR / POR products:
High cohesion enables constructive bonds
High temperature resistance in the cold as well as in the heat enable, for example, use in the automotive industry
Resistance to plasticizers, oils and solvents enables the bonding of soft PVC and demanding filter applications
High level of ageing stability of the bond
PUR have a very wide adhesion spectrum to many plastics, for instance ABS
POR offer a very good adhesion spectrum to low-energy surfaces, for example PP
Our product range
Further adhesives on request.
Particularly suitable for surface lamination and light assembly bonds. Due to the reduced MDI content < 1%, the H351 labelling is no longer required.
- Low MDI < 1 %
- Good sprayability
- FDA guidelines 175.105
- Very long open time
For assembly and constructional bonds that are exposed to high temperatures. Available in black and white.
- Low processing viscosity
- Moisture curing
- UV marked
- Fast cohesion build up
- Good solvent resistance