US 4,367,732 A · Skin barrier

Abstract

A skin barrier consisting of an elastic film (16), secured to the film a layer (18) of at least weakly elastic adhesive material, these two components together having low resistance to quick deformation and rapid recovery to substantially the original shape after deformation, the plastic properties of the adhesive thereby being compensated by the elasticity of the film. Optionally there may be a releasable protective cover (20,22) on the other side of the adhesive layer. The adhesive material consists of a hydrocolloid, preferably sodium carboxymethylcellulose, dispersed in a continuous phase consisting of a mixture of (a) a physically cross-linked elastomer which is a styrene-olefin-styrene block copolymer, (b) a hydrocarbon resin tackifier which is a polymer or copolymer of cyclopentadiene, dicyclopentadiene or .alpha.- or .beta.-pinene, (c) a plasticizer for the elastomer which is compatible at least with the styrene blocks thereof and decreases the upper glass transition temperature thereof, preferably dioctyl adipate, (d) an antioxidant, and (e) optionally an oily extender compatible with the olefin blocks of the elastomer.

Claims10

Dependent claims

A skin barrier, essentially consisting of the following elements in combination:

(A) a non-adhesive, substantially water-impervious, elastic film, secured to one of the faces of an adhesive layer of
(B) an adhesive material which is a gel-like, at least weakly elastic mixture consisting of
(I) a continuous phase consisting of
(a) at least one physically cross-linked elastomer selected from the group consisting of styrene-olefin-styrene block copolymers,
(b) at least one hydrocarbon tackifier resin selected from the group consisting of polymers and copolymers of cyclopentadiene, dicyclopentadiene, .alpha.-pinene and .beta.-pinene,
(c) a polar plasticizer for the elastomer, being compatible at least with its styrene blocks and decreasing the upper glass transition temperature of the styrene blocks of the elastomer,
(d) an antioxidant, and
(e) 0-25%, based on the weight of the adhesive material, of an oily extender,
(II) dispersed in the continuous phase (I) a discontinuous phase consisting of at least one hydrocolloid which is swellable in water,
the aggregate of said water-impervious elastic film (A) and the adhesive material (B) adhering thereto having a low resistance to quick deformation and after deformation a rapid recovery to substantially its original shape.

7 more elements

Dependencies are inferred from the claim text.

Skin barrier

Life of this patent

Skin barrier

Life of this patent

Abstract

Claims10