PRESSURE-SENSITIVE ADHESIVE

摘要

This invention relates to a novel pressure-sensitive adhesive formed of a liquid and solid rubber which is substantially resin free. Preferably the adhesive is formed of a weight ratio of solid rubber to liquid rubber of about 1:0.5 to about 1:7. When a thermoplastic rubber is used, an endblock associating resin can also be used with the block copolymer solid rubber composition for improving adhesion and hold properties of the composition. A minor amount of tackifier can be added without affecting the improved properties of the present invention. The adhesive can preferably be cross-linked with a sulfur, sulfur-bearing agents, peroxide, isocyanate or an aluminum isopropylate composition. These adhesives exhibit improved adhesion in cold weather and oily surface applications and other properties. The pressure-sensitive adhesives can be used in health care, industrial and drug delivery systems. The adhesives can be processed by a hot melt process for providing improved ecological benefits.