Description
UVACRIL A 26 is a UV-curing solvent-free acrylate copolymer.
Application
UVACRIL A 26 is used for pressure-sensitive adhesives that are applied in molten form and then crosslinked by exposure to UV light. Suggested applications: labels (filmic and paper permanent labels), tapes (double-sided, medical, insulating and speciality tapes).
The degree of crosslinking and thus the adhesive properties can be modified by varying the UV exposure: high exposures give greater shear strength, while low exposures gives higher tack and lower shear strenth. Small deviations in the chosen radiation dosage have little effect on the adhesive properties.
Technical Specifications
| Method of analysis | MU | Standard |
|---|---|---|
| 1 Total Solids | % | > 99 |
| 119 Viscosity (130°) | Pa.s | 30 - 70 1 |
| 1 EN ISO 3219,app B, cone and plate, shear rate 100 s-1) | ||
| Method of analysis | MU | Standard |
|---|
Handling
UVACRIL A 26 can be processed in conventional hot melt adhesive coating machines at 110-140°C. After application, the product must be exposed to UV light (conventional medium-pressure mercury vapour lamps or microwave-excited UV lamps are suitable). The most effective wavelength range is between 220 and 280 nm. Since irradiation is usually carried out from one side only, a slight gradient in crosslinking density in the coating sets in (obviously depending on the coating weight); therefore coatings produced under identical conditions, except direct and transfer process, can exhibit different adhesive properties. To avoid crosslinking gradient, a coating weight of maximum 100 g/m2 should not be exceeded.
Packaging
The product is supplied in fiber drums (190 kg).
Storing
Use within 12 months from production date (unopened and in the original packaging).
Notes
Glass transition temperature Tg (DSC) : -39°C