Bomar Resins
LumiSet™ Resin


LSR-241P: Polyether Urethane Methacrylate Resin

LumiSet™ LSR-241P 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-241P is a solvent-borne film-forming resin that can offer nail lacquer formulators the benefits of impact resistance and durability from nail gels while also achieving a tack-free finish without the need for UV or LED lamps. The combination of toughness and hydrophobicity offers formulators an alternative to leachable plasticizers or potentially toxic gloss enhancers. Top coats formulated with LSR-241P should be paired with an adhesion-promoting base coat or base/color coat combo to ensure proper adhesion to the nail bed. LSR-241P is INCI registered and can be formulated to cure with sunlight exposure using appropriate INCI-registered photoinitiators. Adding cellulosic film formers to this neat polyurethane resin increases the tack-free dry time to acceptable nail lacquer dry times of two minutes or less.

Uncured Properties
Viscosity, cP (25°C)13,000
Yellowness Index (b*) ǂ0.01
Density, g/cm3 (25°C)0.99
MEHQ Content (ppm)Undetectable
% Solids50% in butyl acetate
Tack Free Time (min.) ǂǂ18

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
PropertyAir DriedSunlight Cured
Tensile Strength, psi**1,5005,800
Elongation, %**700460
Elastic Modulus, ksi**3.715
Toughness (J)2.75.0
Sward Hardness - 30 minutes13
Sward Hardness - 24 hours23
Contact Angle9488

** Per ASTM D882. Air-dried and cured in Q-Sun for 1 hour at 0.19 W/m2


  • Excellent hydrophobicity in the polymer backbone
  • Can be formulated to yield fast dry times
  • Dries to a tack-free film
  • Polymer is flexible without plasticizers
  • Inherent toughness improves chip resistance
  • Reactive to cure with sunlight exposure
  • Can be formulated to develop a high gloss finish


  • Hybrid nail lacquer top coats
Back to top