The peel strength and tensile shear strength of polyester hobmelt adhesives on metals coated with epoxy resins are affected by four characteristics of the polyester: (I) inherent viscosity, (2) glass transition temperature (T,), (3) degree of crystallinity, and (4) melting point. The inherent viscosity affects the strength, toughness, and crystallinity of the adhesive. The T, and degree of crystallinity affect the low-temperature adhesive properties; the peel strength is relatively low when the T, is appreciably above the use temperature. The T,, degree of crystallinity, and melting point affect the hightemperature adhesive properties. A hobmelt adhesive with high peel and tensile shear strengths from 0' to 120°C is the polyester of 1,4butanediol and trans-l,4cyclohexanedicarboxylic acid.
The peel strength and tensile shear strength of polyester hobmelt adhesives on metals coated with epoxy resins are affected by four characteristics of the polyester: (I) inherent viscosity, (2) glass transition temperature (T,), (3) degree of crystallinity, and (4) melting point. The inherent viscosity affects the strength, toughness, and crystallinity of the adhesive. The T, and degree of crystallinity affect the low-temperature adhesive properties; the peel strength is relatively low when the T, is appreciably above the use temperature. The T,, degree of crystallinity, and melting point affect the hightemperature adhesive properties. A hobmelt adhesive with high peel and tensile shear strengths from 0' to 120°C is the polyester of 1,4butanediol and trans-l,4cyclohexanedicarboxylic acid.<br>
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