- STRUCTURAL ADHESIVES HAVING IMPROVED WASH-OFF RESISTANCE AND METHOD FOR DISPENSING SAME

摘要

The uncured adhesive preferably comprises particles of semi-crystalline organic material of 2 to 10% by weight, preferably a number average molecular weight of 2000 to 10,000, a hydroxyl of 10 to 60, and a polyester having a melting temperature of 50 to 125 & do. The adhesive is applied by heating just before application to melt the particles. After application, the adhesive is cooled to below the melting temperature of the semi-crystalline organic material and then cured. This process causes the adhesive to be stored and pumped at ambient temperature due to the normal viscosity of the material. In the melting and re-cooling of semi-crystalline organic materials, the adhesive exhibits a high yield stress giving very good wash-off resistance. In a preferred embodiment, the adhesive composition comprises an epoxy resin and an epoxy curing agent.