Permeable pressure sensitive adhesive

• US 8,710,130 B2
• Filed: 06/17/2008
• Issued: 04/29/2014
• Est. Priority Date: 07/06/2007
• Status: Active Grant

• Current Assignee: Coloplast A/S
• Original Assignee: Coloplast A/S
• Inventors: Lykke, Mads, Toftkaer, Astrid, Buus, Hasse, Kongebo, Tom
• Primary Examiner(s): Harlan, Robert D.
• Application Number:
  US12/452,513
• Publication Number:
  US 20100204632A1
• Time in Patent Office: 2,142 Days
• Field of Search: 524/582, 524/563, 524/556, 524/270, 524/284, 524/424, 524/428
• US Class Current: 524/284
• CPC Class Codes: A61L 15/58 Adhesives
• CPC Class Codes: A61L 24/06 obtained by reactions only involving carbon-to-carbon unsaturated bonds A61L24/043, A61L24/046 take precedence
• CPC Class Codes: C08L 23/0853 Vinylacetate
• CPC Class Codes: C08L 23/0869 Acids or derivatives thereof
• CPC Class Codes: C08L 2666/02 Organic macromolecular compounds, natural resins, waxes or and bituminous materials
• CPC Class Codes: C08L 29/04 Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
• CPC Class Codes: C08L 91/06 Waxes
• CPC Class Codes: C09J 123/0853 Vinylacetate
• CPC Class Codes: C09J 123/0869 Acids or derivatives thereof
• CPC Class Codes: C09J 2301/414 presence of a copolymer
• CPC Class Codes: C09J 2423/00 Presence of polyolefin
• 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 428/2822 Wax containing
• CPC Class Codes: Y10T 428/2826 Synthetic resin or polymer
• CPC Class Codes: Y10T 428/2848 Three or more layers

Abstract

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

Claims

1. A layered adhesive construct comprising a backing layer and at least one layer of a pressure sensitive, hot melt processable adhesive composition comprising polypropyleneoxide in the content of above 10% (w/w) of the final adhesive, and at least one polar polyethylene copolymer, wherein the content of the polyethylene copolymer is 10-50% (w/w) of the final adhesive, the polyethylene copolymer has a melt flow index below 2 g/10min (190°

C/21.1 N), wherein the at least one 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 monoxide, and combinations thereof,

provided that when the polar polyethylene copolymer is ethylene vinyl acetate, the ethylene vinyl acetate has a content of at least 40% (w/w) vinyl acetate.

2. The layered adhesive construct according to claim 1, wherein the final adhesive in continuous form exhibits a moisture vapour transmission rate of at least 100 g/m²/day for a 150 m adhesive sheet when measured according to MVTR Test Method.

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

4. The layered adhesive construct according to claim 3, wherein the ethylene vinyl acetate has a content of 40-80% (w/w) vinyl acetate.

5. The layered adhesive construct according to claim 1, wherein the content of the polar polyethylene copolymer is 10-45% (w/w) of the final adhesive.

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

7. The layered adhesive construct according to claim 1, wherein the composition further includes an additional plasticizer selected from the group consisting of of liquid rosin derivatives, aromatic olefin oligomers, vegetable and animal oils and derivatives, esters, ethers and glycols, and alpha-butoxy-polyoxypropylene.

8. The layered adhesive construct according to claim 7, wherein the content of the polypropylene oxide plus the additional plasticizer is 20-70% (w/w) of the final adhesive.

9. The layered adhesive construct according to claim 1, wherein the composition further comprises a polymer with MFI >

2(190°

C/21.1N).

10. The layered adhesive construct according to claim 1, wherein the composition further comprises a tackifying resin.

11. The layered adhesive construct according to claim 10, wherein the content of the tackifying resin is 0.1-40% (w/w) of the final adhesive.

12. The layered adhesive construct according to claim 1, wherein the 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 and solid resin.

13. The layered adhesive construct according to claim 1, wherein the composition further comprises a polyethylene wax.

14. The layered adhesive construct according to claim 1, wherein the composition further comprises other ingredients selected from the group consisting of antioxidants, stabilisers, fillers, pigments, flow modifiers, and active ingredients.

15. The layered adhesive construct according to claim 14, wherein the other ingredients are polar active ingredients.

16. The layered adhesive construct according to claim 1, wherein the composition further comprises absorbing particles.

17. The layered adhesive construct according to claim 16, wherein the absorbing particles comprise hydrocolloid and the amount of hydrocolloid is below 50% w/w of the total composition.

18. The layered adhesive construct according to claim 1, wherein the composition further comprises a salt.

19. The layered adhesive construct according to claim 18, wherein the salt is a water soluble inorganic salt selected from the group consisting of NaCl, CaCl₂, K₂SO₄ , NaHC0₃, Na₂CO₃, KCl, NaBr, NaI, KI, NH₄Cl, AlCl₃, and mixtures thereof.

20. The layered adhesive construct according to claim 18, wherein the salt is a water soluble organic salt selected from the group consisting of CH₃COONa, CH₃COOK, HCOONa, HCOOK and mixtures thereof.

21. A beta-sterilised layered adhesive construct according to claim 1.

22. The layered adhesive construct according to claim 1, wherein the construct further comprises at least one layer of a water absorbing adhesive.

23. The layered adhesive construct according to claim 22, wherein the layer of a pressure sensitive adhesive composition is between said layer of a water absorbing adhesive and the skin.

29. The layered adhesive construct according to claim 1, wherein the content of the polar polyethylene copolymer is 15-30% (w/w) of the final adhesive.

30. The layered adhesive construct according to claim 7, wherein the content of the polypropylene oxide plus the additional plasticizer is 40-60% (w/w) of the final adhesive.

31. The layered adhesive construct according to claim 10, wherein the tackifying resin is selected from the group consisting of natural, modified and synthetic resins, polar resins, rosin esters and derivatives thereof, and pure aromatic monomer resins.

32. The layered adhesive construct according to claim 10, wherein the content of the tackifying resin is 10-20% (w/w) of the final adhesive.

24. A medical device comprising (a) a pressure sensitive hot melt processible adhesive composition containing polypropyleneoxide in the content of above 10% (w/w) of the final adhesive, and at least one polar polyethylene copolymer, wherein the content of the polyethylene copolymer is 10-50% (w/w) of the final adhesive, the polyethylene copolymer has a melt flow index below 2 g/10min (190°

C/21.1N), wherein the at least one 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 monoxide, and combinations thereof, and (b) a backing layer.

25. The medical device according to claim 24, wherein the backing layer is non-vapour permeable.

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

27. The medical device according to claim 24, wherein the medical device is a dressing, an ostomy appliance, a prosthesis, a breast prosthesis, a urine collecting device, a faecal management device, a measuring instrument or a therapeutic instrument, a medical tape, or a dressing or bandage for sealing around a medical device on the skin.

28. The medical device according to claim 24, wherein the medical device is a beta-sterilised medical device.