Bomar Oligomer Product
UV/EB Oligomer

BR-742M

BR-742M: Difunctional Aliphatic Polyester Urethane Methacrylate Oligomer

BR-742M is a medium molecular weight, difunctional, aliphatic polyester urethane methacrylate offering excellent adhesion, flexibility, and hardness balance. BR-742M offers an excellent balance of gloss, low heat generation, low color, and low MeHQ for nail coating applications. It can also be effectively formulated for adhesion to steel, aluminum, and glass. Due to its low solvent resistance, it can be formulated into solvent strippable temporary coatings. This material has low skin sensitivity for dental and cosmetic applications.

Neat Properties
Property Value
Viscosity cP (60ºC) 28,000
Pt-Co (APHA) Color 15
Refractive Index (25ºC) 1.484
Density, g/cm3 (25ºC) 1.11
Monomer Dilution Properties
Value
Property I30 I50 TM50 TP50 H50 HE30
Durometer Hardness 79D 80D 88D 78D 81D 79D
Elastic Modulus (GPa [ksi]) 620.5 [90] 1,379.0 [200] 1,654.7 [240] 965.3 [140] 1,034.2 [150] 448.2 [65]
Elongation (%) 70 7.6 2.3 13.1 5.7 70
MEK Double Rubs (#) 66 12 >200 42 160 65
Tensile Strength (MPa [psi]) 20.0 [2900] 24.8 [3600] 33.1 [4800] 25.5 [3700] 30.3 [4400] 14.5 [2100]
Water Absorption (%) 24hrs 0.27 0.20 0.40 0.45 0.35 1.33
Viscosity (cP) 17,000 @ 25ºC 1,200 @ 25ºC 8,600 @ 25ºC 1,200 @ 25ºC 400 @ 25ºC 3,200 @ 25ºC

Features

  • Improves adhesion
  • Balance of hardness and flexibility
  • Low heat generation during cure
  • Low MeHQ
  • Low skin irritation
  • Non-yellowing
  • Glossy finish

Applications

  • Nail gel polish
  • Coatings for glass
  • Coatings for metals
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