Different pressure sensitive adhesives need to be developed for each particular application to meet damping requirements

Pressure-sensitive adhesives (PSA) are known to provide adhesion or stickiness to a variety of substrates when applied at room temperature (in the temperature range of about 20 ° C to about 25 ° C). This adhesion provides instantaneous adhesion to the substrate when subjected to pressure. Psas are generally easy to handle in solid form and have a long service life, so they are widely used in the manufacture of many products.

PSA, for example, provides a convenient and economical way to label a variety of goods, such as glass, metal, and plastic parts of consumer and industrial products. PSA can also be used in the manufacture of car parts. In some applications, PSA is used to bond parts to each other.

PSA can also provide other functional features, such as damping. Damping may include damping to mitigate resonances or other vibrations caused by a variety of sources, for example, in the engine compartment, cab walls, housing, floor and ceiling systems, door panels, and brake systems.

Damping can also include muffling to reduce noise. Vibration can occur in many applications, including but not limited to transportation (e.g., ships and other vessels, railcars, cars, trucks, buses, motorcycles, aircraft, and spacecraft), electronics, building materials, and appliances. However, frequency and temperature ranges may vary from application to application, and certain methods or techniques are required to reduce vibration.

For this wide range of applications, damping characteristics can be adjusted according to the frequency and temperature of the application. In particular applications, braking systems in transportation applications are generally known to experience vibration. The vibration occurs both in the brake system as a whole and between its components, such as between the brake pad layer and the brake calipers. Vibration leads to undesirable performance characteristics, such as sound production, such as crunch/squeak, or poor vehicle driving, such as rocking. When used in braking applications, PSA attenuates vibration and causes the brake assembly layers to adhere to each other. In another use, electronic devices are also known to vibrate. For example, a computer or other electronic system may vibrate while it is working. PSA performance may also be affected by climate and temperature. Unfortunately, conventional PSA has been found to have damping properties only over a limited range of temperatures and/or frequencies. As a result, different Psas need to be developed for each particular application to meet damping requirements (temperature and frequency).