Bomar Oligomer Product
UV/EB Oligomer

BR-771F

BR-771F: Difunctional Aliphatic Polyester Urethane Acrylate

BR-771F is a low molecular weight oligomer with a good balance of high tensile strength and moderate elongation with an excellent cure speed. BR-771F exhibits excellent adhesion to plastic substrates, particularly polycarbonate. Formulations made with BR-771F can exhibit superior toughness properties with a high Tg. Its inherently low color and aliphatic backbone make BR-771F an excellent candidate for polycarbonate coatings and adhesives.

Neat Properties
Property Value
Viscosity cP (60ºC) 42,000
Pt-Co (APHA) Color 20
Refractive Index (25ºC) 1.50
Density, g/cm3 (25ºC) 1.18
Monomer Dilution Properties
Value
Property I30 I50 TM50 TP50 H50 HE30
Durometer Hardness 82D 83D 90D 82D 82D 82D
Elastic Modulus (GPa [ksi]) 965.3 [140] 1,241.1 [180] 1,654.7 [240] 965.3 [140] 1,103.2 [160] 344.7 [50]
Elongation (%) 10 15 3.2 13 7.5 70
MEK Double Rubs (#) >200 36 >200 >200 >200 56
Tensile Strength (MPa [psi]) 26.2 [3800] 29.0 [4200] 42.1 [6100] 26.2 [3800] 37.9 [5500] 17.9 [2600]
Water Absorption (%) 24hrs 0.32 0.22 0.38 0.49 0.37 1.61
Viscosity (cP) 43,000 @ 25ºC 3,000 @ 25ºC 14,000 @ 25ºC 2,200 @ 25ºC 700 @ 25ºC 6,000 @ 25ºC

Features

  • Fast curing
  • High tensile strength
  • Moderate elongation
  • Increased weatherability
  • Excellent polycarbonate adhesion
  • Hydrolytically stable
  • Low color, non yellowing

Applications

  • Plastic coatings
  • Tough 3D printing resins
  • Structural adhesives
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