Price: 10.00
Many papers have been written describing metal containing oligomers. (12,3) Little has been reported on metal containing acrylic oligomers. (4, For years, Sartomer Company has produced zinc diacrylate (ZDA) for use in peroxide cured rubber. Polymers crosslinked with ZDA possess ionic crosslinks, which result in different and often enhanced properties when compared to more conventional covalent crosslinks. For example, elastomers crosslinked with ZDA possess low tan 6 values comparable to sulfur crosslinked elastomers. Elastomers covalently crosslinked with standard multifunctional acrylates have a significantly higher tan6. The similarity of metallic and sulfur crosslinks is related to the mobile nature of these bonds compared to crosslinks formed by typical multivalent acrylic monomers. Metal acrylates have not found wide use in UV curing because of their lack of solubility in standard monomer/oligomer formulations. To solve this solubility problem Sartomer has developed a series of organic metal acrylates, which are monomer soluble. These products are soluble in typical monomers such as TPGDA and TMPTA. Because of their hydrophobic nature, these metal-containing oligomers can be used at high levels in standard UV formulations. When formulated with monofunctional acrylates or methacrylates, they produce clear films containing only mobile, reversible ionic crosslinks. These oligomers formulated with monofunctional acrylates permit the production of UV cured hot melt coatings, adhesives and powder coatings that flow at high temperatures and revert to ionically crosslinked films at ambient temperatures.
