Abstract
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. The Tg and degree of crystallinity affect the low‐temperature adhesive properties; the peel strength is relatively low when the Tg is appreciably above the use temperature. The Tg, 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 and trans‐1,4‐cyclohexanedicarboxylic acid.
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