Product

VESTAGON® BF

VESTAGON® BF grades are internally blocked IPDI based polyisocyanates enabling the formulation of coatings with considerably low emission values.

Our VESTAGON® BF grades bear isocyanate groups reversibly reacted with each other. During synthesis the reactive isocyanate groups are rendered inert through the formation of a relatively weak uretdione ring. This bond can be cleaved upon heating starting from 30 min. at 120°C.

Although the total isocyanate content of these products is similar to e-caprolactam blocked grades, their functionality is somewhat lower. The use of polyesters with a higher hydroxyl content can compensate for this.

Product
Supply Form  
NCO Content
TG
Remarks
VESTAGON® BF 1320
Coarsely ground
13.5-15.0 % bwt
~75 ˚C   
Higher functionality than VESTAGON® BF 1540
VESTAGON® BF 1321
Coarsely ground
14.0-15.5 % bwt
~77 ˚C
Lower melt viscosity compared to BF 1320. Particularly suitable for heat transfer printing application using one shot matte PUR powder coatings
VESTAGON® EP-BF 1350
Coarsely ground
12.5-14.0 % bwt
~61 ˚C
For polyurethane coatings with Class A surfaces
VESTAGON® BF 1540
Granules
15.2-17.0 % bwt
~84 ˚C
Uretdione with high isocyanate content; good choice for standard, non-emissive polyurethanes