Adhesive composition or structure

摘要

An adhesive composition or structure is proposed for use in skin application, e.g. drug delivery wound care, or for attaching devices to collect body waste to the wearer. The composition comprises (a) a polymer or mixture of polymers which act as a pressure-sensitive adhesive present in an amount 20-60 parts by weight of the adhesive composition; and (b) a water-swellable polymer present in an amount 20-80 parts by weight of the adhesive composition. The polymer is one which will absorb from 50 to 500 grams of pure water per 100 grams of water-swellable polymer. Additionally there may be present up to 30 parts by weight (of the adhesive composition) of a water-soluble polymer. The water-swellable polymer may be provided as a coating on non-water-soluble and non-water-swellable fibres which limit swelling of the coating to be radial of the fibres. By arranging or aligning the fibres, the direction of swelling of the composition or structure can be controlled. An adhesive ostomy pad is described which expands substantially in only one direction to avoid blocking the stoma aperture.