Composite material with adhesion promoter layer based on Si, C and O

Patent metadata

Field	Value
Publication number	US-11897208-B2
Application number	US-202016737946-A
Country	US
Kind code	B2
Filing date	Jan 9, 2020
Priority date	Jan 11, 2019
Publication date	Feb 13, 2024
Grant date	Feb 13, 2024

Abstract

A composite material includes: a substrate and a polymer layer which are interconnected by an adhesion promoter layer. The adhesion promoter layer is obtainable by plasma-enhanced chemical vapor deposition (PE-CVD) at least partially using a mixture of precursor compounds containing an unsaturated hydrocarbon and an organosilicon compound. In an embodiment, the substrate includes a metal substrate or a polymer substrate.

First claim

What is claimed is:

1. A composite material, comprising:
a substrate and a polymer layer which are directly interconnected by an adhesion promoter layer,
wherein the substrate comprises a molded body and a surface of the substrate that directly contacts the adhesion promoter layer comprises a material selected from the group consisting of steel, stainless steel, iron, brass, elemental aluminum, elemental silicon, thermoplastic polymer, and thermoset polymer,
wherein the adhesion promoter layer is obtained by plasma-enhanced chemical vapor deposition (PE-CVD) at least partially using a mixture of precursor compounds containing an unsaturated hydrocarbon and an organosilicon compound,
wherein a surface of the adhesion promoter layer to which the polymer layer is directly connected has a proportion of C which is >50 at. %, as determined by X-ray photoelectron spectroscopy, and
wherein the polymer layer is obtained by applying a polymer compound to the adhesion promoter layer and crosslinking the polymer compound to form the polymer layer.

2. The composite material according to claim 1 , wherein the organosilicon compound comprises a siloxane, silane, or silicate.

3. The composite material according to claim 2 , wherein the siloxane comprises hexamethyldisiloxane, and/or wherein the silane comprises tetramethylsilane.

4. The composite material according to claim 1 , wherein the unsaturated hydrocarbon comprises ethylene or acetylene.

5. The composite material according to claim 1 , wherein the adhesion promoter layer is formed as a gradient layer, and
wherein in the gradient layer, a proportion of carbon increases toward the polymer layer and a proportion of Si decreases toward the polymer layer.

6. The composite material according to claim 1 , wherein the adhesion promoter layer is covalently bonded to the polymer layer.

7. The composite material according to claim 1 , wherein the surface of the adhesion promoter layer and/or the adhesion promoter layer as a whole comprises:
Si: 3 at. % to 25 at. %,
C: 50 at. % to 90 at. %,
O: 5 at. % to 25 at. %.

8. The composite material according to claim 1 , wherein the polymer layer comprises a polymer selected from fluorine rubber; ethylene propylene copolymers comprising ethylene propylene diene rubber, polyacrylate rubber, or ethylene acrylate rubber; butadiene rubber comprising acrylonitrile butadiene rubber, hydrated acrylonitrile butadiene rubber, styrene-butadiene rubber, silicone rubbers, natural rubber, chloroprene rubber, or epichlorohydrin rubber; polyurethane; or epoxy polymers.

9. The composite material according to claim 1 , wherein the substrate is not a fluoropolymer.

10. The composite material according to claim 1 , wherein the adhesion promoter layer has a thickness of 30 nm to 10 μm.

11. A sealing article, comprising:
the composite material according to claim 1 .

12. A method for producing the composite material according to claim 1 , comprising the steps of:
(a) providing the substrate;
(b) coating the substrate with the adhesion promoter layer by plasma-enhanced chemical vapor deposition (PE-CVD);
(c) applying a polymer compound to the adhesion promoter layer; and
(d) crosslinking the polymer compound,
wherein the adhesion promoter layer is covalently bonded to the polymer layer.

13. The method according to claim 12 , wherein when the polymer compound is crosslinked in step (d), unsaturated carbon bonds at a surface of the adhesion promoter layer react with the polymer compound.

14. A method of using the composite material according to claim 1 , comprising:
providing the composite material as a sealing article, or using the composite material to produce a sealing article.

15. The composite material according to claim 7 , wherein the surface of the adhesion promoter layer and/or the adhesion promoter layer as a whole comprises:
Si: 4 at. % to 20 at. %,
C: 60 at. % to 85 at. %,
O: 10 at. % to 20 at. %.

16. The composite material according to claim 15 , wherein a sum of Si+C+0 in at least one of the surface of the adhesion promoter layer and the adhesion promotor layer as a whole is >90%, and
wherein a remainder is H, N, and additional elements from the substrate.

17. The composite material according to claim 7 , wherein a sum of Si+C+0 in at least one of the surface of the adhesion promoter layer and the adhesion promotor layer as a whole is >90%, and
wherein a remainder is H, N, and additional elements from the substrate.

18. The composite material according to claim 1 , wherein the adhesion promoter layer as a whole has a proportion of C which is >50 at. %.

Assignees

• Freudenberg Carl Kg

Inventors

• Von Fragstein Friederike
• Marksteiner Albin
• Christopher Roman
• Rutz Stephan
• Hallstein Katharina
• Feller Kai
• Fetsch Yvonne
• Adler Matthias

Classifications

• B29C65/528 Primary

  by CVD or by PVD, i.e. by chemical vapour deposition or by physical vapour deposition · CPC title

• B29C35/02

  Heating or curing, e.g. crosslinking or vulcanizing {during moulding, e.g. in a mould}(cold vulcanisation B29C35/18 {; vulcanising tyres, presses therefor B29D30/0601}) · CPC title

• B29C65/483

  Reactive adhesives, e.g. chemically curing adhesives · CPC title

• B29C66/74283

  Iron or alloys of iron, e.g. steel · CPC title

• B32B27/283

  comprising polysiloxanes · CPC title