Polyester hot‐melt adhesives. I. Factors affecting adhesion to epoxy resin coatings

摘要

AbstractThe peel strength and tensile shear strength of polyester hot‐melt adhesives on metals coated with epoxy resins are affected by four characteristics of the polyester: (1) inherent viscosity, (2) glass transition temperature (Tg), (3) degree of crystallinity, and (4) melting point. The inherent viscosity affects the strength, toughness, and crystallinity of the adhesive. TheTgand degree of crystallinity affect the low‐temperature adhesive properties; the peel strength is relatively low when theTgis appreciably above the use temperature. TheTg, degree of crystallinity, and melting point affect the high‐temperature adhesive properties. A hot‐melt adhesive with high peel and tensile shear strengths from 0° to 120°C is the polyester of 1,4‐butanediol andtrans‐1,4‐cyclohexanedi