Sealing assembly and method of making such assembly
The disclosure is directed to a sealing assembly. The sealing assembly includes a cap having a top surface and a bottom surface, an adhesive layer adjacent the bottom surface of the cap, and a septum adjacent to the adhesive layer. The adhesive layer includes a self-bonding silicone composition and the septum includes at least one fluoropolymer layer. The disclosure is further directed to methods for making the aforementioned sealing assembly.
1. A sealing assembly comprising:
a cap having a top surface and a bottom surface;
an adhesive layer including a self-bonding silicone composition directly in contact with the bottom surface of the cap, wherein the self-bonding silicone composition is a silicone polymer chemically modified with an adhesion promoter and the self-bonding silicone composition adheres directly to the bottom surface of the cap without a surface treatment or a primer between the self-bonding silicone composition and the bottom surface of the cap to enhance the adhesion between the cap and the adhesive layer; and
a septum adjacent to the adhesive layer, wherein the septum includes at least one fluoropolymer layer.
2. The sealing assembly of claim 1 , wherein the self-bonding silicone composition includes a polyalkylsiloxane and the adhesion promoter.
3. The sealing assembly of claim 2 , wherein the polyalkylsiloxane is liquid silicone rubber (LSR) or high consistency gum rubber (HCR).
4. The sealing assembly of claim 1 , wherein the self-bonding silicone composition is partially-cured.
5. The sealing assembly of claim 1 , wherein the adhesion promoter includes a silsesquioxane, an ester of unsaturated aliphatic carboxylic acid, or mixture thereof.
6. The sealing assembly of claim 1 , wherein the fluoropolymer includes polytetrafluoroethylene (PTFE).
7. The sealing assembly of claim 1 , wherein the septum further includes a silicone layer disposed between the adhesive layer and the fluoropolymer layer.
8. The sealing assembly of claim 7 , wherein the silicone layer includes a high consistency gum rubber (HCR).
9. The sealing assembly of claim 1 , having a bond strength between the bottom surface of the cap and the septum of greater than about 30 psi.
10. A sealing assembly comprising:
a cap having a top surface and a bottom surface; and
a septum, wherein the septum includes an adhesive layer including a self-bonding silicone composition directly in contact with the bottom surface of the cap, wherein the self-bonding silicone composition is a silicone polymer chemically modified with an adhesion promoter and the self-bonding silicone composition adheres directly to the bottom surface of the cap without a surface treatment or a primer between the self-bonding silicone composition and the bottom surface of the cap to enhance the adhesion between the cap and the adhesive layer, and
at least one fluoropolymer layer adjacent to the adhesive layer.
11. The sealing assembly of claim 10 , wherein the self-bonding silicone composition includes a polyalkylsiloxane and the adhesion promoter.
12. The sealing assembly of claim 11 , wherein the polyalkylsiloxane is high consistency gum rubber (HCR).
13. The sealing assembly of claim 12 , wherein the high consistency gum rubber (HCR) is partially-cured.
14. The sealing assembly of claim 10 , wherein the adhesion promoter includes a silsesquioxane, an ester of unsaturated aliphatic carboxylic acid, or mixture thereof.