ADHESIVE COMPOSITION AND METHOD

摘要

An adhesive composition contains a block copolymer hot melt adhesive and a vapor releasing vapor corrosion inhibitor mixed with the block copolymer hot melt adhesive, the vapor corrosion inhibitor being in the form of particles suspended in the adhesive composition, the particles preferably having a maximum dimension of less than about 30 microns. One improvement results from inclusion in the adhesive mixture of a titanium and/or zirconium containing coupling agent, either separately or as part of the VCI particles. Another improvement results from blending the adhesive mixture in a continuous process using for example a twin screw extruder. As a result, the adhesive mixture has better uniformity and superior viscosity properties during use.

主权项

1. A method of manufacturing a corrosion inhibiting hot melt adhesive composition in multiple stages, the method comprising
in a first stage at a first shear rate, melting an adhesive at a first temperature above 120° C.; in a second stage, increasing the shear to a second shear rate and reducing the temperature below 120° C.; in a third stage, adding a vapor corrosion inhibiting powder to the adhesive while maintaining a sufficient shear to maintain the temperature below 120° C. while providing melt flow for a sufficient time to disperse the powder in the adhesive, wherein the powder comprises a carrier and a vapor phase corrosion inhibitor.