Pressure-Sensitive Raw Materials

Flame-Retardant Pressure-Sensitive Adhesives Derived from Epoxidized Soybean Oil and Phosphorus-Containing Dicarboxylic Acids

“…When the level of ESO is increased 40%, the peel strength of E40-P1 (2.3 N/cm) slightly decreased, as previously observed in Figure , and the high bonding modulus that compensated for the high dissipation or flow made the bonding marginal. It was generally agreed that the transition from cohesive to interfacial failure was associated with the transition from liquid-like behavior to rubber-like behavior. ,, With a further increase in the ESO ratio to 50%, the adhesives became rubberlike with the lowest adhesion level. E60-P1 exhibited a cross-linking density lower than that of E50-P1, suggesting the chain mobility and wettability were better, which resulted a greater adhesion force (1.6 N/cm vs 0.5 N/cm).…”

“…Pressure-sensitive adhesives (PSAs) are special types of adhesives that form a bond when external pressure is applied to make the adhesive cling to the adherend. Because of their soft nature and liquid viscoelasticity, they can form a contact with rough and nonwetting surfaces. − According to the required technical specifications, such as permanent or removable applications, PSAs must bond materials efficiently in a fast and safe way. − Except for natural rubbers, PSA categories are still based on petroleum. − Polymers derived from renewable resources have recently experienced a remarkable resurgence because of long-term environmental and availability concerns associated with petroleum derivatives. , Among the different kinds of renewable raw materials, plant oils are currently one of the most abundant, most biodegradable, least toxic, and cheapest renewable raw materials, which have been widely used as promising monomers of thermosetting composites in various applications such as foams, elastomers, coatings, and paints. − In addition, the long aliphatic chains of the fatty acids impart unique properties to the resulting polymeric materials such as elasticity, flexibility, hydrolytic stability, hydrophobicity, and low glass transition temperatures ( T g ), making them suitable for PSAs. − Li and co-workers , obtained PSAs by reacting ESO with at least one dibasic acid (e.g., sebacic acid) or anhydride at molar ratios ranging from 3:1 to 1:3. The subsequent curing led to a tacky coating that had good adhesive properties for various substrates.…”

Preparation and Characterization of a Renewable Pressure-Sensitive Adhesive System Derived from ε-Decalactone, l-Lactide, Epoxidized Soybean Oil, and Rosin Ester

“…Pressure-sensitive adhesives (PSAs) are a special category of viscoelastic materials that firmly adhere to various dissimilar surfaces upon a mere finger or hand contact, showing ubiquitous applications in numerous industries, especially in the electric, automotive, packing, and medical industries . PSAs should possess both liquid-like viscosity to wet quickly surfaces for good sticky contact and solid-like elasticity for resistance to flow during a separation or debonding process. , The conflicting properties of PSA are difficult to achieve within a single material. Viscoelastic fine-tuning in PSAs is known to control adhesive properties.…”

New Waterborne Polyurethane-Urea Synthesized with Ether-Carbonate Copolymer and Amino-Alcohol Chain Extenders with Tailored Pressure-Sensitive Adhesion Properties

“…PSAs are used in general in labels and tapes, post-its, packaging tapes, diapers, masking tapes, and medical bandages, etc. The requirements of the PSAs for these applications are good tack, adequate peel resistance, and high-shear resistance [7]. During bonding of a substrate by a PSA, good wetting and adequate adhesion are needed, but the PSA also needs to resist de-bonding forces by high cohesion and energy dissipation without leaving residues on the substrate, i.e., high cohesion is necessary.…”