Water-based hybrid pressure sensitive adhesive

The organosilicon PSA composition exhibits both good high-temperature and low-temperature properties, with excellent chemical inertness, electrical insulation, and the ability to bond to substrates with low surface energy. However, the disadvantage of organosilicon PSA compositions is their high cost compared to other technologies. Other limitations compared to acrylic Psas include low viscosity and limited adhesion build-up (where necessary).

At the same time, acrylic PSA compositions are relatively low-cost compared to other Psas, bond well to a variety of different surfaces, and can be formulated to accumulate bonds to surfaces if needed. However, the disadvantages of acrylic PSA compositions include poor high-temperature performance, poor low-temperature performance, and inability to bond to the surface with low surface energy.

Therefore, hybrid PSA compositions, such as organosilica-modified acrylate-like PSA compositions, have been studied. For example, US Patent Application Publication No. Us 2012/0095159 A1 discloses an organosilicon acrylate hybrid pressure-sensitive adhesive composition that chemically reacts together an organosilicon polymer component, an organosilicon resin component, and an acrylic polymer component to form a hybrid organosilicon acrylate polymer.

The acrylic polymer component is covalent self-crosslinked and covalently bonded to the silicone polymer component and/or the silicone resin component. However, the hybrid organosilicon acrylate polymers tend to form gels, allowing the chemical reactions to form the polymers to take place in organic solvents.

In addition, due to safety and environmental advantages, water-based PSA compositions are required but are difficult to prepare because such water-based compositions are too hard to emulsify or disperse the hybrid organosilicon acrylate polymer into water.

US Patent Application Publication No. Us 2015/0284612A1 discloses an acryloyl-organosilica-based hybrid emulsion binder composition comprising an acrylic emulsion resin prepared by emulsion polymerization of a mixture of acrylic monomers and crystals formed by reactive organosilicon resins having reactive groups, such as vinyl groups. However, due to the poor reactivity of acrylic monomers and reactive organosilicon resins with vinyl groups in water, such organosilicon migration problems have been observed from cured acrylic organosilica-based hybrid Psas. In addition, the peel adhesion of cured acrylic organosilica-based hybrid PSA is insufficient.