Urethane Acrylate Oligomers
Urethane acrylate oligomers offer improved performance properties in adhesives, electronics, coatings, inks, elastomers, photopolymers, polymer concrete, flooring and flexible packaging, to name a few. A number of urethane acrylate products have been developed to meet the requirements of these diverse applications.
These oligomers are high molecular weight, reactive materials that play a significant role in cure-in-place technology. Urethane acrylate oligomers can be cured (polymerized) using any of several free radical mechanisms, including electron beam (EB), ultraviolet radiation (UV), and peroxide decomposition or Michael Addition reaction chemistry.
Urethane Acrylate Oligomer Overview
Sartomer’s urethane acrylate oligomers are developed with performance in mind. Urethane acrylate oligomers are a desired ingredient in free radically cured formulations as they provide chemical resistance, heat resistance, water resistance and adhesion to name a few. The chemical nature and structure of these oligomers determine the physical properties obtained upon curing or polymerization. The physical properties imparted are generally the key factor in choosing which urethane acrylate oligomer to use in a particular application.
Physical properties of urethane acrylate oligomers in the liquid or uncured state are as important in determining which urethane acrylate to choose as the physical properties of the cured film. Therefore, the viscosity and refractive index of the aliphatic and aromatic oligomers in the liquid state have been analyzed in addition to the solid film properties.
Types of Urethane Acrylate Structures
Key determinants of urethane acrylate oligomer performance lie in the structural elements of the molecule. Urethane acrylate oligomers are synthesized by reacting a diisocyanate with a polyester or polyether polyol to yield an isocyanate terminated urethane. Subsequently, hydroxy terminated acrylates are reacted with the terminal isocyanate groups. This acrylation provides the unsaturation or the (C=C) group to the ends of the oligomer.
Sartomer offers the following urethane acrylate oligomer structures:
Sepciality Urethane Acrylate Properties
- Elongation and flexibility
- Excellent outdoor resistance
- High chemical resistance
- Superior mechanical properties
- Very good pigment wetting