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The material selection platform
Adhesives Ingredients
The material selection platform
Adhesives Ingredients

Waterborne Polyurethane Pressure Sensitive Adhesives (A)

Adhesives Formulation

Applicable Type
Applicable Base Polymer
Applicable Industrial Sectors

Applicable Base Polymer Properties

Polyurethane adhesives are often chosen over polychloroprene adhesives when greater resistance to plasticizer migration is required or difficult to bond polymeric substrates are involved. One of the largest applications is in footwear where high bond strengths to PVC compositions are required. However, PUDs have not, as yet, found a large market in pressure sensitive adhesives.

Typical Formulation Ingredients

Ingredient
Parts by weight
Experimental polyurethane dispersion (Dow Chemical) 
xx 
Tackifier (Snowtack 765A, Nobel) 
xx 
Tackifier (Aquatac 6025, Arizona Chemical) 
x 
Surfactant (Surfynol 465, Air Products) 
xxx 
Surfactant (Surfynol SE-F, Air Products) 
x 
Plasticizer (Citroflex 2, Vertelus) 
x 
Thickener (Acrysol, 6038, Rohm & Haas) 
x 
(Source: Cranley, P., et. al., “Polyurethane Dispersion Based Pressure Sensitive Adhesives”, Dow Chemical Co., Freeport, TX) 
 

Typical Properties

Properties
Peel, pli 
xxxx 
Tack, gms 
xx 
Shear, hours 
xxxxxx 

Processing

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Resulting Properties

Polyurethane adhesives also give the formulator more freedom in “engineering” the modulus and elongation required of the adhesive film to meet specific applications. New continuous PU dispersion technology has led to the creation of novel PUDs based upon polyether polyols and methylene diphenyl diisocyanate (MDI). These PU dispersions are solvent free, high solids (50-60 wt), and have submicron sized particles and excellent stability. The PUDs from this process have been found useful for designing PSAs with properties ranging from removable to high shear strength.

Tips and Tricks

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