Hypro™ reactive liquid polymers are used as elastomeric modifiers for thermoset adhesives notably of the epoxy and acrylic varieties. For epoxies, CTBN (carboxyl terminated butadiene-acrylonitrile) and ATBN (amine terminated butadiene-acrylonitrile) liquid polymers behave as tougheners for one-and two-part adhesives and for acrylics, methacrylated reactive liquid polymers as VTBNX behave as tougheners or flexibilizers. One specific property provided by an elastomer toughened epoxy or acrylic adhesive is enhanced peel strength compared to an unmodified version. That is achieved through the unique morphology of phase separated rubber (RLP) in a continuous matrix (epoxy or acrylic). Additionally due to the low glass transition temperature of these reactive liquid polymers, structural adhesive properties are maintained at low temperatures. Another chemistry applicable to RLP modification is that associated with epoxy methacrylates or vinyl esters.
HyproTM reactive liquid polymers are typically used at levels of 5-15 phr for toughening a structural adhesive. However greater concentrations may be used in developing lower modulus, non-structural thermoset adhesives.
|Resin matrix:||Recommended RLP:||Typical benefits:|
|Epoxy||CTBN, CTBNX||Enhances toughness/flexibility|
|ATBN||Increases low temperature mechanical properties|
|Acrylic||VTB, VTBNX||Improves adhesion to difficult to bond substrates|
|Increases impact or crack resistance|
|Improves durability/fatigue resistance|
For more specific information pertaining to the use of the RLP materials in structural adhesives please contact your local Emerald Performance Materials Sales Representative or contact our Customer Service Group 888.889.9150.
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