Energy savings plus mechanical reinforcement and rheology control

Repulpable Polyester Hot Melt for PSA Medical Tape

Adhesives Formulation

Applicable Type

Hot-melt Adhesives

Applicable Industrial Sectors

Tapes

Applicable Base Polymer Properties

The water-dispersible polyester in this formulation is a branched, amorphous material comprised of difunctional acid and glycol. Their water-dispersibility is due to the presence of pendent sodiosulfo groups randomly distributed along the polymer backbone, and this characteristic makes the adhesive highly suitable for paper repulping processes. The unique properties of the polyester are derived from a branched architecture and a specific combination of monomers resulting in a low Tg and enhanced compatibility with other resins. The low Tg provides, in part, the means by which water-dispersibility is readily obtained at or below room temperature. The branched structure of the polyester results in low melt viscosity profiles that are required for hot-melt adhesive formulations.

Typical Formulation Ingredients

Phase

Ingredient

Parts by weight

Polyester resin (WDP-35, Eastman Chemical)

Plasticizer

Typical Properties

Properties

Viscosity @ 177°C, cps

xxxxxxx

90° Quick tack, g/mm

Room temperature holding power, hrs

Ring and ball softening point, °C

Peel adhesion, g/mm

xxx

Processing

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Resulting Properties

A starting point formulation using the WDP-35 polyester as the base polymer is described in formulation of Repulpable Polyester Hot Melt for PSA Medical Tape. The water-dispersible polyester based formulation compared favorably to the performance characteristics of conventional hygienic adhesives. Due to the unique feature of the polyester not being dispersible in ionic solutions, such as bodily fluids, it should enhance the performance of the product in medical applications. The source of this formulation is Miller, R.A. and Althen, G., “Optimization of Hot Melt Adhesives Using Water Dispersible Polyesters”, Proceedings of the TAPPI Hot Melt Adhesive Seminar 1996.)