Abstract: A purpose of the disclosed method is to impart gathers and elasticity to a relatively inelastic film, membrane, or web substrate, through elastic banding with a viscoelastic hot melt pressure-sensitive adhesive (PSA). Typically, the resulting elastic-banded substrate product (e.g. 40) will be cut into discrete units and formed into garments or body-encircling members such as disposable diapers. One step of the preferred method involves extruding a ribbon or band (13 or 113) comprising a viscoelastic hot melt PSA, which PSA has unusually high cohesion, stretchiness, and elasticity without excessive loss of adhesive bonding strength. (The viscoelastic behavior of the PSA is believed to be determined, at least in part, by the relative size of its crystalline domains and its rubbery domains and the glass transition temperatures and softening points of its components.

Abstract: A purpose of the disclosed method is to impart gathers and elasticity to a relatively inelastic film, membrane, or web substrate, through elastic banding with a viscoelastic hot melt pressure-sensitive adhesive (PSA). Typically, the resulting elastic-banded substrate product (e.g. 40) will be cut into discrete units and formed in to garments or body-encircling members such as disposable diapers. One step of the preferred method involves extruding a ribbon or band (13 or 113) comprising a viscoelastic hot melt PSA, which PSA has unusually high cohesion, stretchiness, and elasticity without excessive loss of adhesive bonding strength. (The viscoelastic behavior of the PSA is believed to be determined, at least in part, by the relative size of its crystalline domains and its rubbery domains and the glass transition temperatures and softening point of its components.

Abstract: It has been found that a layered recording disc having an inexpensive core layer and high quality recording groove-accepting outer layers can be made in a relatively simple manner through an application of the technique known as coextrusion, wherein a common die, e.g. a coextrusion die (10) having a die orifice (11) for a plurality of streams (13, 23, and 33) provides a multilayer coextrudate (60) having a plurality of layers (64, 74, and 84). The coextrudate (60) can be cut into segments (60a) with a suitable cutting means (20). The coextrudate segments can be substantially of record thickness with a circular periphery. Alternatively, coextrudate segments (60b) can be much thicker than a record and much smaller in surface area. In either case, segments can be compression molded into discs (100) having the desired profile and/or grooves.

Abstract: A viscoelastic hot melt pressure-sensitive adhesive consisting essentially of:(a) about 35 to about 55% by weight of a rubbery block copolymer which comprises a rubbery polyisoprene midblock portion and a plurality of end blocks comprising a crystalline poly(vinylarene);(b) about 25 to 45% by weight of a terpene tackifying resin generally compatible with and generally associated with said midblock portion;(c) about 10 to about 30% by weight of an aromatic, essentially hydrocarbon resin having a glass transition temperature and a softening point above about 115.degree. C., said essentially hydrocarbon resin being generally compatible with said end blocks of said rubbery block copolymer;the proportions of said components (a), (b), and (c) being selected to provide the following pressure-sensitive adhesive and rheological properties:(i) a tensile strength at 500% elongation, determined at 20.degree.-25.degree. C., of at least 50 pounds per square inch;(ii) a 180.degree.