Bomar Oligomer Product
UV/EB Oligomer

BR-3741AJ

BR-3741AJ: 1.3 Functional Aliphatic Polyether Urethane Acrylate Oligomer

BR-3741AJ is an aliphatic 1.3 acrylate functional polyether urethane. The extremely elongative nature of BR-3741AJ makes it an excellent candidate for consideration in UV light curable PSAs as a reactive tackifier. It is also used as a co-oligomer for adhesion promotion in coatings. Films formulated with BR-3741AJ are highly flexible, elastomeric, and tacky. This oligomer is an excellent adhesion promoter, and compared to other reactive tackifiers it results in relatively tougher films. It is a perfect choice for optically clear UV pressure-sensitive adhesives (PSAs).

Neat Properties
Property Value
Viscosity cP (60ºC) 23,000
Pt-Co (APHA) Color 15
Refractive Index (25ºC) 1.46
Density, g/cm3 (25ºC) 1.01
Monomer Dilution Properties
Value
Property I30 I50 TM50 TP50 H50 HE30
Durometer Hardness 20A 26D 63D 38D 41D ?
Elastic Modulus (GPa [ksi]) 0.3 [0.05] 42.1 [6.1] 275.8 [40] 68.9 [10] 103.4 [15] ?
Elongation (%) 300 900 4.2 20 13 ?
MEK Double Rubs (#) 100 54 >200 32 8 ?
Tensile Strength (MPa [psi]) 0.4 [55] 4.8 [700] 9.0 [1300] 4.8 [700] 6.9 [1000] ?
Water Absorption (%) 24hrs 1.18 0.77 1.57 1.38 1.19 ?
Viscosity (cP) 20,000 @ 25ºC 3,500 @ 25ºC 16,000 @ 25ºC 4,200 @ 25ºC 2,300 @ 25ºC 14,000 @ 25ºC

Features

  • Enhances flexibility
  • Non-yellowing
  • Optically clear
  • Oil and chemical resistant
  • Provides softness
  • Adheres to a wide range of substrates
  • Exhibits hydrolytic stability

Applications

  • Pressure-sensitive adhesives
  • Reactive tackifier
  • Adhesion promoter
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