Permeable pressure sensitive adhesive

• US 9,249,343 B2
• Filed: 12/02/2013
• Issued: 02/02/2016
• Est. Priority Date: 12/18/2008
• Status: Active Grant

• Current Assignee: Coloplast A/S
• Original Assignee: Coloplast A/S
• Inventors: Buus, Hasse, Lykke, Mads, Kongebo, Tom
• Primary Examiner(s): BROWN, MICHAEL A
• Application Number:
  US14/093,757
• Publication Number:
  US 20140087183A1
• Time in Patent Office: 792 Days
• Field of Search: 602 41- 54
• US Class Current: 1/1
• CPC Class Codes: A61L 15/585 Mixtures of macromolecular compounds
• CPC Class Codes: A61L 24/043 Mixtures of macromolecular materials
• CPC Class Codes: A61L 2400/14 Adhesives for ostomy devices
• CPC Class Codes: C08K 5/0008 Organic ingredients according to more than one of the "one dot" groups of C08K5/01 - C08K5/59
• CPC Class Codes: C08L 23/08 Copolymers of ethene C08L23/16 takes precedence
• CPC Class Codes: C08L 23/0853 Vinylacetate
• CPC Class Codes: C08L 23/22 Copolymers of isobutene; Butyl rubber ; Homo- or copolymers of other iso-olefins
• CPC Class Codes: C08L 2666/06 Homopolymers or copolymers of unsaturated hydrocarbons; Derivatives thereof
• CPC Class Codes: C08L 71/02 Polyalkylene oxides
• CPC Class Codes: C09J 123/0853 Vinylacetate
• CPC Class Codes: C09J 123/20 having four to nine carbon atoms
• CPC Class Codes: C09J 123/22 Copolymers of isobutene; Butyl rubber ; Homo- or copolymers of other iso-olefines
• CPC Class Codes: C09J 2301/414 presence of a copolymer
• CPC Class Codes: C09J 2423/04 Presence of homo or copolymers of ethene
• CPC Class Codes: C09J 2423/10 Presence of homo or copolymers of propene
• CPC Class Codes: C09J 2431/00 Presence of polyvinyl acetate
• CPC Class Codes: C09J 7/381 based on macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
• CPC Class Codes: Y10T 428/2848 Three or more layers
• CPC Class Codes: Y10T 428/2878 including addition polymer from unsaturated monomer
• CPC Class Codes: Y10T 428/2883 including addition polymer of diene monomer [e.g., SBR, SIS, etc.]

Abstract

The present invention relates to a pressure sensitive, hot melt processable adhesive composition comprising a polar plasticizing oil, a polar polyethylene copolymer and polyisobutylene and a layered adhesive construction and a medical device comprising the adhesive composition according to the invention.

Claims

1. A layered adhesive construction comprising:

a backing layer;

a first layer of a pressure sensitive adhesive composition comprising a polar plasticising oil or a combination of polar plasticising oils in the content of 30-60% (w/w), at least one polar polyethylene copolymer in a content of 10-45% (w/w), and 1-30% (w/w) of polyisobutylene, the at least one polyethylene copolymer having a melt flow index below 2 g/10 min (190°

C./21.1N); and

a second layer of a water absorbing adhesive.

2. The layered adhesive construction according to claim 1, wherein the first layer of a pressure sensitive adhesive composition exhibits a moisture vapour transmission rate of at least 100 g/m²/day for a 150 micrometers thick adhesive sheet when measured according to MVTR Test Method.

3. The layered adhesive construction according to claim 1, wherein the polar polyethylene copolymer is selected from the group consisting of ethylene vinyl acetate, ethylene vinyl acetate carbon monoxide, ethylene butyl acetate, ethylene vinyl alcohol, ethylene butyl acrylate, ethylene butyl acrylate carbon monoxide, and combinations thereof.

4. The layered adhesive construction according to claim 1, wherein the polar polyethylene copolymer is ethylene vinyl acetate.

5. The layered adhesive construction according to claim 4, wherein the ethylene vinyl acetate has a content of 40-80% (w/w) vinyl acetate.

6. The layered adhesive construction according to claim 1, wherein the polar polyethylene copolymer has a molecular weight of above 250,000 g/mol.

7. The layered adhesive construction according to claim 1, wherein the polar plasticising oil is selected from the group of liquid rosin derivatives, aromatic olefin oligomers, vegetable and animal oils and derivatives, preferable polar oils are esters, ethers and glycols and particularly preferred is poly propylene oxide such as alpha-butoxy-polyoxypropylene.

8. The layered adhesive construction according to claim 1, wherein the polyisobutylene has a molecular weight of below 100,000 g/mol.

9. The layered adhesive construction according to claim 1, wherein the first layer of the pressure sensitive adhesive composition further comprises a tackifier resin.

10. The layered adhesive construction according to claim 9, wherein a content of the tackifier resin is 10-20%.

11. The layered adhesive construction according to claim 1, wherein the first layer of the pressure sensitive adhesive composition further comprises an additional plasticiser selected from the group consisting of mineral oil, citrate oil, paraffin oil, phatalic acid esters, adepic acid esters, and liquid or solid resin.

12. The layered adhesive construction according to claim 1, wherein the first layer of the pressure sensitive adhesive composition further comprises a polyethylene wax.

13. The layered adhesive construction according to claim 1, wherein the first layer of the pressure sensitive adhesive composition further comprises at least one of an antioxidant, a stabiliser, a filler, a pigment, a flow modifier, and an active ingredient.

14. A medical device comprising a layered adhesive construction according to claim 1.

15. The medical device according to claim 14, wherein the backing layer is non-vapour permeable.

16. The medical device according to claim 14, wherein the backing layer is water vapour permeable and has a moisture vapour transmission rate above 500 g/m²/24 h.

17. The medical device according to claim 14, wherein the medical device is selected from the group consisting of a dressing, an ostomy appliance, a prosthesis, a urine collecting device, a faecal management device, a measuring instrument, a therapeutic instrument, a medical tape, and a dressing or bandage for sealing around a medical device on the skin.