Styrene-butadiene rubbers or SBRs are widely used in the manufacture of pressure sensitive tapes. They are synthetic elastomers derived from styrene and butadiene. SBRs, whether solventborne or waterborne, are found in many PSAs and are tailored for variety of applications.
Their properties depend on the percent of bound styrene, the average molecular weight and its distribution, and the presence of functional groups introduced during polymerization. In general, styrene-butadiene based PSAs have better heat-aging properties then NR based PSAs, whereas their physical strength, resilience and low temperature properties are usually inferior to natural rubber based PSAs. SBRs are sometimes blended with natural rubber to achieve the optimal properties.
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