Layered adhesive construction with adhesive layers having different hydrocolloid composition

• US 8,951,237 B2
• Filed: 02/08/2012
• Issued: 02/10/2015
• Est. Priority Date: 01/18/2006
• Status: Active Grant

• Current Assignee: Coloplast A/S
• Original Assignee: Coloplast A/S
• Inventors: Nordby, Bolette, Ciok, Danuta
• Primary Examiner(s): Su, Susan
• Assistant Examiner(s): Townsend, Guy K
• Application Number:
  US13/369,121
• Publication Number:
  US 20120209229A1
• Time in Patent Office: 1,098 Days
• Field of Search: 604/336
• US Class Current: 604/336
• CPC Class Codes: A61L 24/0031 Hydrogels or hydrocolloids
• CPC Class Codes: A61L 24/043 Mixtures of macromolecular materials
• CPC Class Codes: C08L 1/286 substituted with acid radicals, e.g. carboxymethyl cellulose [CMC] C08L1/282 takes precedence
• CPC Class Codes: C08L 2666/26 Natural polymers, natural resins or derivatives thereof according to C08L1/00 - C08L5/00, C08L89/00, C08L93/00, C08L97/00 or C08L99/00
• CPC Class Codes: C08L 5/00 Compositions of polysaccharides or of their derivatives not provided for in groups C08L1/00 or C08L3/00
• CPC Class Codes: C08L 5/06 Pectin; Derivatives thereof
• CPC Class Codes: C08L 53/02 of vinyl-aromatic monomers and conjugated dienes
• CPC Class Codes: C08L 89/06 derived from leather or skin , e.g. gelatin
• CPC Class Codes: C09J 101/286 substituted with acid radicals C09J101/282 takes precedence
• CPC Class Codes: C09J 105/00 Adhesives based on polysaccharides or on their derivatives, not provided for in groups C09J101/00 or C09J103/00
• CPC Class Codes: C09J 189/06 derived from leather or skin
• CPC Class Codes: Y10T 428/24959 of adhesive layers
• CPC Class Codes: Y10T 428/2848 Three or more layers

Abstract

A layered adhesive construction comprising a backing layer and a first and second layer of hydrocolloid adhesive, where the first and second layer of hydrocolloid adhesive have different composition, and the second layer of hydrocolloid adhesive is at least partly interposed between the first layer of hydrocolloid adhesive and the backing layer, the first and second adhesive layers consisting of a continuous phase and a discontinuous phase where the discontinuous phase of the first adhesive layer comprises a hydrocolloids providing a higher moisture absorption capacity and higher initial rate of absorption to the adhesive layer than the hydrocolloids in the discontinuous phase of the second adhesive layer, and the discontinuous phase of second layer of adhesive comprises hydrocolloids providing a higher cohesion following moisture absorption to the adhesive compared to the hydrocolloid in the discontinuous phase of the first adhesive layer.

Claims

1. A layered adhesive construction comprising a backing layer and a first and second layer of hydrocolloid adhesive, where the first and second layer of hydrocolloid adhesive have different composition such that the hydrocolloids or mixture of hydrocolloids of the first and the second adhesive layer are different, and further where the second layer of hydrocolloid adhesive is at least partly interposed between the first layer of hydrocolloid adhesive and the backing layer, the first and second adhesive layers each having a continuous phase and a discontinuous phase, wherein

a) the discontinuous phase of the first adhesive layer comprises a hydrocolloid providing a higher moisture absorption capacity and higher initial rate of absorption to the adhesive layer than the hydrocolloids in the discontinuous phase of the second adhesive layer,

b) the discontinuous phase of the second layer of adhesive comprises a hydrocolloid providing a higher cohesion following moisture absorption to the adhesive compared to the hydrocolloid in the discontinuous phase of the first adhesive layer, and

c) the composition of the continuous phase of the first adhesive layer and of the continuous phase of the second adhesive layer are identical or essentially identical.

2. The layered adhesive construction according to claim 1, wherein the discontinuous phase of the first adhesive layer comprises 40-50% w/w of carboxymethylcellulose, and the discontinuous phase of the second adhesive layer comprises 35-45% w/w guar gum.

3. The layered construction according to claim 2 wherein the discontinuous phase of the first adhesive layer comprises between 40 and 50% w/w of carboxymethylcellulose.

4. The layered construction according to claim 3, wherein the discontinuous phase of the first adhesive layer comprises 45% w/w of carboxymethyl cellulose.

5. The layered adhesive construction according to claim 2 wherein the discontinuous phase of the second adhesive layer comprises between 35 and 45% w/w of guar gum, and 15-25% w/w of carboxymethylcellulose.

6. The layered adhesive construction according to claim 5, wherein the discontinuous phase of the second adhesive layer comprises 40% w/w of guar gum, and 20% w/w carboxymethyl cellulose.

7. The layered construction according to claim 1, wherein the discontinuous phase in the first adhesive layer comprises pectin, gelatine and sodium carboxymethyl-cellulose and the discontinuous phase in the second adhesive layer comprises guar gum, gelatine and sodium carboxymethyl cellulose.

8. The layered adhesive construction according to claim 7, wherein the first adhesive layer comprises a mixture of:

40-50% w/w of carboxymethyl cellulose,

15-25% w/w of pectin, and

30-40% w/w of gelatine,

based on the weight of the discontinuous phase,

and the second adhesive layer comprises a mixture of;

35-45% w/w of guar gum,

15-25% w/w, of carboxymethyl cellulose, and

35-45% w/w of gelatine,

based on the weight of the discontinuous phase.

9. The layered adhesive construction according to claim 8, wherein the first adhesive layer comprises a mixture of:

45% w/w of carboxymethyl cellulose,

20% w/w of pectin, and

33-35% w/w of gelatine,

based on the weight of the discontinuous phase,

and the second adhesive layer comprises a mixture of;

40% w/w of guar gum,

20% w/w of carboxymethyl cellulose and

40% w/w of gelatine,

based on the weight of the discontinuous phase.

10. The layered construction according to claim 1, wherein the firstadhesive layer comprises 45-55% by weight of the discontinuous phase.

11. The layered construction according to claim 10, wherein the first adhesive layer comprises 50% by weight of the discontinuous phase.

12. The layered construction according to claim 1, wherein the second adhesive layer comprises 45-55% by weight of the discontinuous phase.

13. The layered construction according to claim 1, wherein the first adhesive layer is thinner than the second adhesive layer at least in the area where the second adhesive layer is interposed between the backing layer and the first adhesive layer.

14. The layered construction according to claim 13, wherein the second adhesive layer is extending beyond the peripheral edge of the first adhesive layer.

15. The layered adhesive construction according to claim 14, wherein the first adhesive is thinner than the second adhesive layer and is embedded in the second adhesive layer.

16. The layered adhesive construction according to claim 15, wherein the second adhesive layer is placed on top of the first adhesive layer.

17. The layered construction according to claim 13, wherein the first and second adhesive layer have the same area and shape and are aligned on top of each other.

18. An ostomy appliance comprising an adhesive construction according to claim 1.

19. The layered construction according to claim 1, wherein the second adhesive layer comprises 50% by weight of the discontinuous phase.