BREATHABLE SELF-ADHESIVE ARTICLES

• US 20150030848A1
• Filed: 03/12/2012
• Published: 01/29/2015
• Est. Priority Date: 03/12/2012
• Status: Active Grant

• Current Assignee: Bostik SA (Arkema)
• Original Assignee: Bostik SA (Arkema)
• Inventors: Goubard, David
• Granted Patent: US 10,898,389 B2
• Time in Patent Office: Days
• US Class Current: 428/341
• CPC Class Codes: A61F 13/0253 characterized by the adhesive material
• CPC Class Codes: A61F 2013/00268 impervious, i.e. occlusive bandage
• CPC Class Codes: A61L 15/42 Use of materials characterised by their function or physical properties liquid bandages A61L26/00
• CPC Class Codes: A61L 15/58 Adhesives
• CPC Class Codes: A61L 15/585 Mixtures of macromolecular compounds
• CPC Class Codes: C08G 18/10 Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step
• CPC Class Codes: C08G 18/12 using two or more compounds having active hydrogen in the first polymerisation step
• CPC Class Codes: C08G 18/42 Polycondensates having carboxylic or carbonic ester groups in the main chain
• CPC Class Codes: C08G 18/48 Polyethers
• CPC Class Codes: C08G 18/4825 Polyethers containing two hydroxy groups C08G18/4833 - C08G18/5096 take precedence
• CPC Class Codes: C08G 18/4866 having a low unsaturation value
• CPC Class Codes: C08G 18/718 containing silicon
• CPC Class Codes: C08G 18/755 and at least one isocyanate or isothiocyanate group linked to a secondary carbon atom of the cycloaliphatic ring, e.g. isophorone diisocyanate
• CPC Class Codes: C08G 65/336 containing silicon
• CPC Class Codes: C09J 171/00 Adhesives based on polyethers obtained by reactions forming an ether link in the main chain based on polyacetals C09J159/00; based on epoxy resins C09J163/00; based on polythioether-ethers C09J181/02; based on polyethersulfones C09J181/06; Adhesives based on derivatives of such polymers
• CPC Class Codes: C09J 171/02 Polyalkylene oxides
• CPC Class Codes: C09J 175/04 Polyurethanes
• CPC Class Codes: C09J 175/08 from polyethers
• CPC Class Codes: C09J 2301/312 parameters being the characterizing feature
• CPC Class Codes: C09J 2400/263 in the substrate
• CPC Class Codes: C09J 2453/003 : in the primer coating
• CPC Class Codes: C09J 2471/003 : in the primer coating
• CPC Class Codes: C09J 2475/00 : Presence of polyurethane
• CPC Class Codes: C09J 2475/003 : in the primer coating
• CPC Class Codes: C09J 7/21 : Paper; Textile fabrics
• CPC Class Codes: C09J 7/38 : Pressure-sensitive adhesives [PSA]
• CPC Class Codes: Y10T 428/273 : of coating
• CPC Class Codes: Y10T 428/2852 : Adhesive compositions

Abstract

The invention relates to the use of an adhesive composition comprising at least one silyl-containing polymer, at least one compatible tackifying resin and at least one catalyst, to make a breathable self-adhesive article. The invention also relates to a breathable self-adhesive article comprising at least one breathable substrate coated with a breathable adhesive layer. The invention also relates to a pressure-sensitive adhesive composition.

Claims

1. Method for making a breathable self-adhesive article, comprising a step of using an adhesive composition comprising at least one silyl-containing polymer, at least one compatible tackifying resin and at least one catalyst.

2. Method according to claim 1, wherein the adhesive article comprises a substrate and an adhesive layer.

3. Method according to claim 1, wherein the adhesive composition comprises:

a) from 20 to 85% by weight of at least one silyl-containing polymer,

b) from 15 to 80% by weight of at least one tackifying resin,

c) from 0.01 to 3% by weight of at least one catalyst.

4. Method according to claim 1, wherein the tackifying resin has a Softening Point inferior or equal to 150°

C.

5. Method according to claim 1, wherein the silyl-containing polymer is selected from a silyl-containing polyether, a silyl-containing polyurethane, a silyl-containing polyurethane having polyurethane-polyether and polyurethane-polyester blocks, and mixtures thereof.

6. Method according to claim 1, wherein the tackifying resin is selected from phenol modified terpene resins, hydrocarbon resins, rosin ester resins, acrylic resins and mixtures thereof.

7. Method according to claim 1, wherein the adhesive layer having a coating weight below 50 g/m² has a Moisture-Vapour Transmission Rate superior or equal to 300 g/m²/24 h.

8. Method according to claim 1, wherein the adhesive layer having a coating weight below or equal to 30 g/m² has a Moisture-Vapour Transmission Rate superior or equal to 500 g/m²/24 h.

9. Method according to claim 1, wherein the adhesive layer having a coating weight superior or equal to 50 g/m² has a Moisture-Vapour Transmission Rate superior or equal to 100 g/m²/24 h.

10. Method according to claim 1, wherein the substrate has a Moisture-Vapour Transmission Rate superior or equal to the Moisture-Vapour Transmission Rate of the adhesive layer.

11. Self-adhesive article comprising a substrate having a Moisture-Vapour Transmission Rate superior or equal to 1000 g/m²/24 h,

wherein at least one face of said substrate is coated with an adhesive layer obtained by curing an adhesive composition as disclosed in claim 1,

said adhesive layer having a Moisture-Vapour Transmission Rate superior or equal to 300 g/m²/24 h for a coating weight below 50 g/m² and a Moisture-Vapour Transmission Rate superior or equal to 100 g/m²/24 h for a coating weight superior or equal to 50 g/m².

12. Self-adhesive article according to claim 11, wherein the adhesive layer having a coating weight below 50 g/m² has a Moisture-Vapour Transmission Rate superior or equal to 500 g/m²/24 h.

13. Self-adhesive article according to claim 11 wherein the adhesive layer having a coating weight superior or equal to 50 g/m² has a Moisture-Vapour Transmission Rate superior or equal to 200 g/m²/24 h.

14. Process for manufacturing the self-adhesive article according to claim 11, comprising the steps of:

a) Conditioning an adhesive composition as disclosed in any one of claim 1 to 10 at a temperature from 20°

C. to 160°

C., then

b) Coating the adhesive composition obtained at step a) onto a carrying surface;

then

c) Curing the coated adhesive composition by heating the coated substrate at a temperature from 20°

C. to 200°

C.

15. Process according to claim 14 wherein the curing is carried out in an atmosphere in which from 5 to 100% of the molecules are water molecules.

19. Process according to claim 14, further comprising a step of laminating the cured adhesive layer onto a substrate having a Moisture-Vapour Transmission Rate superior or equal to 1000 g/m²/24 h.

16. (canceled)

17. (canceled)

18. (canceled)