Patent ID: 6928794

Claim:
A method of producing a pressure sensitive adhesive, comprising the steps of: (a) providing a continuously moving, unsupported, elongate, thermoplastic, heat sealable web, the web including opposed sheets each having first and second side edges; (b) longitudinally sealing the web along at least one side edge, thereby forming an elongate tube with sealed side edges; (c) providing first and second jaw carrying members defining a sealing path therebetween, the jaw carrying members including a plurality of cooperating pairs of mating jaws traveling at substantially the same velocity as the web along the sealing path, wherein at least one of the jaw carrying members comprises a flexible non-circular conveyor; (d) forming a first transverse seal in the web as the web travels along the sealing path by clamping the web between a pair of mating jaws and bonding the sheets by heating the web, thereby forming a partially formed pouch having sealed side edges, a sealed bottom, and an open top; (e) filling the partially formed pouch with a polymerizable liquid monomer mixture; (f) forming a second transverse seal in the web as the web travels along the sealing path by clamping the web between a pair of mating jaws and bonding the sheets by heating the web, thereby scaling the top of the partially formed pouch; (g) polymerizing the liquid monomer mixture; and (h) blending the polymerized liquid with the web material, thereby to form the pressure sensitive adhesive.