Several low-temprature Pur Hot Melt Adhesive were formulated appliance SBS copolymers* to analyze their viscoelastic achievement with adhesives formulated appliance altered abject polymers. Samples were characterized by DMA. In addition, adhesives were evaluated for rolling brawl tack at bargain temperatures appliance accessories accurately advised for this evaluation, in an attack to accretion if the tack acknowledgment at those temperatures can be activated to the adhering Tg.
Dahlquist accustomed belief based on the Tg of the adhering and its viscoelastic backdrop to ascertain a achievement window for PSA applications. As adhering use has developed to awning new applications, these belief accept been continued to awning them. Aggregate 1 graphs Dahlquist belief and added low-temperature applications. Clearly, it is capital to actuate the Tg for the adhering and its accumulator modulus at mentioned temperature to adumbrate if the adhering is traveling to accomplish according to the requirements for anniversary application, including those at arctic temperatures.

Beneath this temperature, the adhering becomes breakable and loses its accommodation to transform activity in deformation; as a result, the band can be torn easily. Above this temperature, the adhering starts to accomplish as viscoelastic material, and this achievement is maintained all over the temperature breadth articular as adaptable plateau. Finally, in the endure zone, the adhering performs mainly as a adhering actual and trends to flow.

Table 2 presents the capital characteristics of two of the SBS copolymers acclimated in this evaluation. An SIS copolymer was acclimated as reference. Table 3 compares Solprene 4302 and an SIS advertence copolymer appliance a accepted PSA formula. The after-effects appearance that both Pur Hot Melt Manufacturer apparent agnate viscosity, but the SBS-based adhering developed a lower abatement point and bargain Tg.