Design of nanostructured waterborne adhesives with improved shear resistance
Patent - The mechanical and adhesive properties of a series of model nanostructured waterborne PSA films have been characterized. The base polymer composition of the latex has been kept constant but systematic modifications have been carried out: the introduction of nanoparticles localized at the interfaces between particles, and the incorporation of a crosslinking agent. The mechanical properties have been characterized and show that the most effective modifications result in an increase in the low-frequency modulus in the small-strain regime and in a more pronounced softening and strain-rate-dependent behavior in the large-strain regime. In industrial standard tests, this combination gives a dramatically increased resistance to shear while maintaining a high value of peel resistance. Novel waterborne pressure-sensitive adhesives with hard and soft particles were specifically designed to improve their shear resistance without reducing their peel force. Depending on whether the small hard particles are connected or not to the matrix, two different optimal shapes of the stress/strain curve are found giving nearly the same excellent application properties with a different material structure. Copyright (c) 2011 WILEY-VCH Verlag GmbH amp Co. KGaA, Weinheim.
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