Sealing device with improved adhesion

Patent metadata

Field	Value
Publication number	US-9708513-B2
Application number	US-201314399228-A
Country	US
Kind code	B2
Filing date	May 6, 2013
Priority date	May 7, 2012
Publication date	Jul 18, 2017
Grant date	Jul 18, 2017

Abstract

The present invention relates to a sealing device ( 1 ) which comprises a barrier layer ( 2 ) with a thermoplastic polymer P1, and an adhesive layer ( 3 ) with at least one ethylene-vinyl acetate copolymer (EVA) P2 and azo-dicarbonamide A, and which is suitable for sealing bases in the building sector. The invention further relates to a method for sealing said bases. The method according to the invention allows structures of civil engineering to be sealed rapidly and efficiently and ensures good adhesion of the sealing device on the base.

First claim

The invention claimed is:

1. A sealing device comprising:
a sealing layer comprising a thermoplastic polymer;
and an adhesive layer comprising:
at least one ethylene-vinyl acetate copolymer; and
an azodicarbonamide;

wherein the adhesive layer comprises from 0 to 0.5 wt. % of an epoxy resin, based on the total weight of the adhesive layer.

2. The sealing device according to claim 1 , wherein the ethylene-vinyl acetate copolymer comprises from about 25 wt. % to about 30 wt. % vinyl acetate.

3. The sealing device of claim 1 , wherein the azodicarbonamide is present from about 0.5 wt. % to about 2 wt. %, based upon a total weight of the ethylene-vinyl acetate copolymer and the azodicarbonamide.

4. The sealing device of claim 1 , wherein the azodicarbonamide is present from about 4 wt. % to about 8 wt. % based upon a total weight of the ethylene-vinyl acetate copolymer and the azodicarbonamide.

5. The sealing device of claim 1 , wherein the ethylene-vinyl acetate copolymer comprises about 7 wt. % to about 30 wt. % vinyl acetate.

6. The sealing device of claim 1 , wherein the azodicarbonamide is present from about 0.1 wt. % to about 15 wt. % based upon a total weight of the ethylene-vinyl acetate copolymer and the azodicarbonamide.

7. The sealing device of claim 1 , wherein the azodicarbonamide is present from about 2 wt. % to about 10 wt. % based upon a total weight of the ethylene-vinyl acetate copolymer and the azodicarbonamide.

8. The sealing of claim 1 , wherein the adhesive layer further comprises a polymer selected from the group consisting of a maleic acid anhydride-functionalized polyethylene and a maleic acid anhydride-functionalized copolymer made of ethylene and vinyl acetate.

9. The sealing device of claim 8 , wherein the polymer is present from about 4 wt. % to about 17 wt. %, and the azodicarbonamide is present from about 2 wt. % to about 6 wt. % based upon a total weight of ethylene-vinyl acetate copolymer, polymer, and azodicarbonamide.

10. The sealing of claim 8 , wherein the polymer is a maleic acid anhydride-functionalized polyethylene that comprises maleic acid anhydride-functionalized low density polyethylene or maleic acid anhydride-functionalized high density polyethylene.

11. The sealing of claim 8 , wherein the polymer is a maleic acid anhydride-functionalized copolymer comprising ethylene and vinyl acetate.

12. The sealing device of claim 1 , wherein the adhesive layer is free of epoxy resin.

13. The sealing device of claim 1 , wherein the sealing layer comprises a foamed portion on a side facing the adhesive layer.

14. The sealing device of claim 1 , wherein the adhesive layer is tack-free at 23° C.

15. A method for sealing a substrate, the method comprising:
applying the sealing device of claim 1 to the substrate, wherein the adhesive layer faces the substrate; and
heating the adhesive layer.

16. The method of claim 15 , wherein the heating comprises heating to a temperature of about 80° C. to about 600° C.

17. The method of claim 15 further comprising applying a second substrate to the sealing layer after heating the adhesive layer.

18. The method according to claim 17 , wherein the second substrate is asphalt.

Assignees

• Sika Tech Ag

Inventors

• Ackermann Herbert
• Gössi Matthias
• Hoefflin Frank
• Keiser Stefan
• Rohrer Roman
• Rudolf Jean-Claude

Classifications

• Y10T428/31938

  Polymer of monoethylenically unsaturated hydrocarbon · CPC title

• B32B2266/025

  Polyolefin · CPC title

• C09J7/0264

  Chemistry & Metallurgy · mapped topic

• B32B2260/046

  Synthetic resin · CPC title

• B32B5/18

  characterised by features of a layer {of} foamed material · CPC title