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A-6280 is a proprietary non-halogenated additive designed to reduce resin bleed out on a variety of surfaces (especially difficult to control gold surfaces) with minimal or no affect on the adhesion properties of the formulation. It shows excellent results when used in non-metal filled systems. It is co-curable in free-radical polymerization. It can also enhance the rheological properties of various filled adhesives.
A-6280 anti bleed additive is co-curable in free radical polymerization and is recommended for use as an additive to reduce resin bleed out specifically on metal surfaces. The recommended addition of the A-6280 to a formulation is between 0.5% - 1% weight percent of resin. It shows superior bleed control in formulations that contain non-metal fillers such as silica.
Flash point considerationsWe've used anti-bleeds in die attach pastes for years. We did not see nor did we get reports of the die attach pastes (or the components thereof) causing voids during curing. Additionally, the fact that the DMI products will cure into the matrix also reduces volatility concerns.Can I use this as a preapplied/non mix product to reduce bleeding in die attach?
Right now the materials are 100% product, but, if you diluted them with a volatile solvent to aid in the application it might be possible. The process might be:
This could potentially work better than the mixed version as the resin would hit a roadblock when it encountered the relatively concentrated antibleed. If you get too much under the die attach you will likely destroy the adhesion. The tricky part would be how to prepare the solution and how to apply the antibleed mixture and keep it contained.
You can do some simple experiments to see if the concept holds promise: