Stabilized foam for medical PSA substrate

a technology of stabilizing foam and psa, applied in the direction of film/foil adhesives, bandages, drug compositions, etc., to achieve the effect of maintaining cleanliness of operation incision sites, and maintaining acceptable conformability properties

a technology of stabilizing foam and psa, applied in the direction of film/foil adhesives, bandages, drug compositions, etc., to achieve the effect of maintaining cleanliness of operation incision sites, and maintaining acceptable conformability properties

US20050276965A1Inactive Publication Date: 2005-12-15ETCHELLS MARC D
7 Cites 28 Cited by

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0104] A cross-linked closed cell polyolefin foam sourced from Voltek, a div. of Sekisui America Corporation. The foam is a 6-lb / cubic foot density foam that is extrusion coated with a linear low density polyolefin (LLDPE) stabilizing layer on one side. The color is a medium tan or “flesh” color and the total foam thickness is 0.023 inch. This extrusion coating is 0.002 inch thick and is corona treated to assist in firm anchorage of the adhesive layer. Following extrusion coating, the combined thickness is approximately 0.025 inch. The release liner is a 42-lb / ream bleached Kraft paper, available from SilTech division of Technicote, which has been coated with a silicone release coating on one side. The adhesive is a conventional block copolymer synthetic rubber hot melt from HB Fuller and is applied via a melter and gear pump that delivers the adhesive to a slot coating die. The die is from May Coating and it is set up for direct contact or proximity coating against the silicone lin...

example 2

[0107] Cross-linked PO foam is manufactured at 0.016 inches thick with a density of 8-lbs / cubic foot and is extrusion coated with an ultra low density polyolefin film layer at 0.0015 inch thickness. A 0.003 inch polyester film that has been coated with a fluorosilicone release coating for use with silicone adhesives is proximity coated with a Dow Corning hot melt adhesive formulated with silicone.

[0108] The stabilized foam, adhesive layer and silicone release liner are all brought together in a nip between two rollers and the adhesive transfers to the stabilized foam. The assembly is rotary die cut and is useful for EKG grounding pads.

[0109] If required for a grounding pad application, a conductive material such as carbon black, carbon film or carbon fibers can be added to the foam, stabilizing layer and / or adhesive layer. The stabilizing layer allows the production of a thin and soft foam pad with the integrity required for die cutting and converting.

[0110] If the silicone adhes...

example 3

[0111] Cross-linked PO foam is manufactured at 0.031 inches thick with a density of 6-lbs / cubic foot and is extrusion coated with a LLDPE film layer at 0.002 inch thickness. A liquid acrylic adhesive in a solvent, Gelva 2999 from Solutia, is reverse roll coated onto 53-lb Kraft release liner supplied by SilTech. The solvent is driven off as the coated liner travels through a heated oven. As the coated liner exits the oven, it is married to the stabilized foam with a set of rollers. Following slitting to width and perforation via the hot needle system, the laminate is converted into finger bandages and tape.

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Abstract

The present invention provides a stabilized foam having a crosslinked closed cell polyolefin foam having a top and a bottom surface; a stabilizing layer disposed onto at least one of the top and the bottom surfaces of the crosslinked closed cell polyolefin foam; and an adhesive layer disposed onto at least one of the top or the bottom surfaces. Also provided is a method of preparing the stabilized foam, a method of treating a wound, scrape, abrasion or skin puncture, a method of maintaining cleanliness of an operation incision site, suture site, catheter insertion site, or an intentional skin breach site, a method of monitoring electrical impulses during EKG or delivering electrical impulses in a TENS or biofeedback therapy, and a method of softening the collagen deposits on a scar and reducing the raised or keloid portion of the scar over time.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a stabilized foam. More particularly, the present invention relates to a stabilized foam suitable for use in medical and skin contact applications, having a crosslinked closed cell polyolefin foam, at least one stabilizing layer and at least one adhesive layer. [0003] 2. Description of the Related Art [0004] For a variety of medical and skin contact products including first-aid bandages, tapes, absorbent dressings, wound covers and closures, scar reduction therapy pads, electrode grounding pads and drug delivery patches, foam is used as the exterior layer away from the skin. A skin contact adhesive is applied to this foam to provide adhesion to the skin. Many adhesives are in use and include acrylics in hot melt, solvent solution or aqueous suspension, synthetic block copolymer and other hot melts, silicone gels and silicone from solvent or hot melt systems. Often such foam films are...

Claims

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Application Information

Patent Timeline
15 Dec 2005
Publication
US20050276965A1
IPC
A61L15/42; A61L15/58; B32B3/00; B32B3/26; B32B5/18; C08K3/00; C09J7/26
CPC
A61L15/425; A61L15/58; B32B5/18; C08J2205/052; C09J7/0289; C09J2201/28; C09J2483/003; C09J2423/006
Inventors
ETCHELLS, MARC D.