Latent-reactive systems with Dispercoll® U

With latent-reactive dispersion adhesives a one-component formulation of an adhesive dispersion becomes possible while at the same time the properties of a crosslinking two-component system can be obtained. Latent-reactive dispersion adhesives consist of a polyurethane dispersion of a Dispercoll® U type in combination with a deactivated solid isocyanate. The deactivated solid isocyanate reacts with the dispersion polymer only after activation of the adhesive film by temperature.

This techology makes it possible to formulate in three ways:

• Application as latent-reactive polyurethane dispersion
  This eliminates the addition of a crosslinker.
  
  
• Application as a pre-coating of a substrate with a storage stable latent-reactive adhesive film
  Substrates can be coated with a storage stable reactive adhesive film. The process of the film-application and the adhesion itself can be separated in time and location. This makes it possible to streamline processes and make them more effective.
  
  
• Application of a latent-reactive adhesive film
  In cases where the substrate can not be furnished with a latent-reactive adhesive coating the solution can be a block-free adhesive film. This film can either be pre-laminated on the substrate or directly applied as a block-free film between the substrates to be joined.

The Dispercoll® U product range for one-component latent-reactive polyurethane dispersions:

	Viscosity mPas at 23°C	Characteristics
Dispercoll® U 53	50-600	Good property profile for thermo-activatable adhesives
Dispercoll® U 54	40-400	Good property profile for thermo-activatable adhesives
Dispercoll® U 56	50-900	Activation at as low as 40-50°C
Dispercoll® BL XP 2514	-	Suitable isocyanate crosslinker for one-component latent-reactive systems
Dispercoll U XP 2578	< 1000	For latent-reactive dispersion adhesives (in combination with deactivated TDI dimer formulations, e.g. Dispercoll® BL XP 2514), considerably reduced release of TDI from the latent reactive films

Have a look at this detailed information on dispersions for latent-reactive adhesives:

Presentation at FEICA, Sept. 11th, 2008	"Modern waterborne adhesives based on Polyurethanes and Polychloroprenes"
Presentation:	"Latent reactive adhesives based on Dispercoll® U"
Presentation:	"Latent-reaktive Polyurethandispersionsklebstoffe Vorbeschichtung von Dekorfolien" (German)
Video:	This video shows the processing of a precoated TPO-film coated with a latent-reactive adhesive in an IMG-tool. (1,14 min., 8 MB)
Brochure:	"Dispercoll® U – Sticks - When you want it to"
Article in Adhesion 6/2007:	"Latent reactive and storable"

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