LSR-241
LSR-241: Hydrophobic Urethane Methacrylate Resin
LumiSet™ LSR-241 is a hydrophobic urethane methacrylate resin designed for use in top coat applications for hybrid and long-wear nail lacquers. Synthesized using building blocks from nail gel chemistries, LSR-241 is a solvent-borne film-forming resin that can offer nail lacquer formulators the benefits of impact resistance, gloss, and durability from nail gels while also achieving a tack-free finish without the need for UV or LED lamps. The combination of toughness, gloss, and hydrophobicity offers formulators an alternative to leachable plasticizers or potentially toxic gloss enhancers. Top coats formulated with LSR-241 should be paired with an adhesion-promoting base coat or base/color coat combo to ensure proper adhesion to the nail bed. LSR-241 is INCI registered and can be formulated to cure with sunlight exposure using appropriate INCI-registered photoinitiators.
| Uncured Properties | |
|---|---|
| Property | Value |
| Viscosity, cP (25°C) | 400 |
| Yellowness Index (b*) ǂ | 0.14 |
| Density, g/cm3 (25°C) | 0.95 |
| MEHQ Content (ppm) | Undetectable |
| % Solids | 24% in butyl/ethyl acetate blend |
| Tack Free Time (min.) ǂǂ | 1.3 |
ǂ Per ASTM E313
ǂ Per ASTM D5895 5 mil wet film, reduced to 30% solid with butyl acetate
| Film Properties Reduced To 30% Solids With Butyl Acetate | ||
|---|---|---|
| Property | Air Dried | Sunlight Cured |
| Tensile Strength, psi** | 4,500 | 5,200 |
| Elongation, %** | 6 | 6 |
| Elastic Modulus, ksi** | 190 | 205 |
| Toughness (J) | 0.070 | 0.083 |
| Sward Hardness - 30 minutes | 10 | 15 |
| Sward Hardness - 24 hours | 12 | 15 |
| Contact Angle | 94 | 99 |
| Gloss on glass plate 20° | 63 | 63 |
| Gloss on glass plate 60° | 85 | 85 |
| Gloss on glass plate 85° | 95 | 95 |
** Per ASTM D882. Air-dried and cured in Q-Sun for 1 hour at 0.19 W/m2