Methods and apparatus for vacuum thin film deposition
First Claim
1. A method of forming a polymer coating on a surface of a substrate in a vacuum chamber evacuated to a pressure of less than about 10−
- 2 Torr, wherein the method comprises;
(a) providing in the vacuum chamber an evaporation chamber, wherein the evaporation chamber comprises a reservoir of a liquid monomer, wherein the monomer has two or more olefinic groups per molecule and a vapor pressure in the range of 10−
6 to 10−
1 Torr at standard temperature and pressure, and wherein the reservoir of liquid monomer is heated at a temperature below that at which thermal polymerization of liquid monomer is initiated, thereby forming a vapor of the monomer;
(b) allowing the vapor formed by heating the reservoir of liquid monomer to flow to the surface of the substrate, the surface at a temperature below the temperature of the liquid monomer reservoir or vapor;
(c) condensing the vapor on the surface of the substrate to deposit a monomer layer on the surface of the substrate; and
(d) polymerizing the monomer layer formed in step (c) to form the polymer coating on the surface of the substrate.
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Abstract
The present invention provides a polymer coating method. In the method, in a vacuum chamber, a low temperature monomer evaporation chamber is used to heat a liquid monomer and a cooled substrate at a temperature lower than the liquid monomer reservoir or vapor. The liquid monomer is allowed to condense on the cooled substrate surface where it is polymerized by a radiation source. The process depends on the vapor pressure difference between liquid in the monomer source and liquid condensed on the surface of the cooled substrate. The film thickness is dependent on the temperature difference between the monomer reservoir and the substrate, and the time that is required to move the coated substrate from the evaporation chamber to the cure station. The method is suitable for forming very thin, uniform, pinhole-free, polymer coatings from a variety of monomers, having at least two olefinic groups per molecule, on a variety of substrates.
46 Citations
19 Claims
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1. A method of forming a polymer coating on a surface of a substrate in a vacuum chamber evacuated to a pressure of less than about 10−
- 2 Torr, wherein the method comprises;
(a) providing in the vacuum chamber an evaporation chamber, wherein the evaporation chamber comprises a reservoir of a liquid monomer, wherein the monomer has two or more olefinic groups per molecule and a vapor pressure in the range of 10−
6 to 10−
1 Torr at standard temperature and pressure, and wherein the reservoir of liquid monomer is heated at a temperature below that at which thermal polymerization of liquid monomer is initiated, thereby forming a vapor of the monomer;(b) allowing the vapor formed by heating the reservoir of liquid monomer to flow to the surface of the substrate, the surface at a temperature below the temperature of the liquid monomer reservoir or vapor; (c) condensing the vapor on the surface of the substrate to deposit a monomer layer on the surface of the substrate; and (d) polymerizing the monomer layer formed in step (c) to form the polymer coating on the surface of the substrate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
- 2 Torr, wherein the method comprises;
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17. A method of forming a two-part coating on a substrate in a vacuum chamber:
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(a) sputtering a first layer onto the substrate; (b) forming a second layer by; (i) exposing the substrate to a vapor of monomer, wherein the vapor is formed by heating a reservoir of liquid monomer in an evaporation chamber, wherein the evaporation chamber is positioned in the vacuum chamber, at a temperature below that at which thermal polymerization of the monomer is initiated, wherein the liquid monomer has two or more olefinic groups per molecule, and a vapor pressure in the range of 10−
6 to 10−
1 Torr at standard temperature and pressure;(ii) allowing the vapor formed by heating the reservoir of liquid monomer to flow to the surface of the substrate, the surface at a temperature below the temperature of the liquid monomer reservoir or vapor; (iii) condensing the vapor on the surface of the substrate to deposit a monomer layer on the surface of the substrate; and (iv) polymerizing the monomer layer formed in step (c) to form the polymer coating on the surface of the substrate. - View Dependent Claims (18, 19)
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Specification