EP0460796A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Barrier materials useful for packaging
Assignee: EIDP Inc
•
Filing: 1991-04-19
•
Granted: —
•
Expires: 2011-04-19
Abstract
Abstract Improvements to silicon oxide coatings on polymeric substrates are disclosed, which provide improved barrier properties. One improvement involves doping an SiO₂ coating with one or more of certain metals. Another improvement involves first, forming an SiO coating on the substrate, followed by an SiO₂ coating. Another improvement involves the combination of the SiO/SiO₂ coatings plus the incorporation of certain metal dopant into the SiO₂ layer.
Inventors
- 👤 Gedeon Imre Deak
- 👤 Scott Christopher Jackson
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 04:31
CPC Classifications
B; B32; B32B; B32B37/00; B32B37/12; B32B38/00; C; C23; C23C; C23C14/00; C23C14/06; C23C14/10; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31507; Y10T428/31511; Y10T428/31525; Y10T428/31678; Y10T428/31681; Y10T428/31725; Y10T428/31786
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
78 words
A structure having superior barrier properties, comprising: (a) a polymeric substrate, and (b) a glassy coating of silicon dioxide doped with at least one metal selected from the group consisting of antimony, aluminum, chromium, cobalt, copper, indium, iron, lead, manganese, tin, titanium, tungsten, zinc, and zirconium, or lithium borate, said coating and metal dopant contained therein being present in an amount suitable to provide an oxygen transmission value through the coated structure of at most about 5 mL/day-m²-atm.
Claim 2
Dependent Claim
31 words
The structure of claim 1 wherein the amount of metal dopant is suitable to provide an oxygen permeation value for said glassy coating of at most about 3000 X 10⁻⁶ mL-mm/day-m²-atm.
Claim 3
Dependent Claim
21 words
The structure of claim 1 or 2 wherein the thickness of the glassy coating is about 20 to about 500 nm.
Claim 4
Dependent Claim
32 words
The structure of claim 1, 2 or 3 wherein the glassy coating of silicon dioxide is doped with a metal selected from the group consisting of copper, chromium, manganese, tin, and zinc.
Claim 5
Dependent Claim
10 words
The structure of claim 4 wherein the metal is copper.
Claim 6
Dependent Claim
10 words
The structure of claim 4 wherein the metal is tin.
Claim 7
Dependent Claim
37 words
The structure of any one of claims 1 to 6 wherein the amount of dopant metal is sufficiently low that the optical density of said glassy coating retains at least about 70% optical transmission at 550 nm.
Claim 8
Dependent Claim
32 words
The structure of any one of claims 1 to 7 wherein the amount of dopant metal calculated as elemental metal is about 0.5 to about 30 weight percent of the glassy coating.
Claim 9
Dependent Claim
31 words
The structure of any one of claims 1 to 8 wherein the polymeric substrate has a surface smoothness such that the average height of roughness is less than about 50 nanometers.
Claim 10
Dependent Claim
21 words
The structure of any one of claims 1 to 9 wherein the polymeric substrate is a film of polyester or polyamide.
Claim 11
Dependent Claim
12 words
The structure of claim 10 wherein the polyester is oriented polyethylene terephthalate.
Claim 12
Dependent Claim
27 words
The structure of any one of Claims 1 to 11 wherein a layer of SiO is present between said polymeric substrate and said coating of silicon dioxide.
Claim 13
Dependent Claim
43 words
A structure having superior barrier properties, comprising: (a) a polymeric substrate, and (b) a glassy coating of silicon dioxide doped with lithium borate in an amount suitable to provide an oxygen transmission value through the coated structure of at most about 5 mL/day-m²-atm.
Claim 14
Dependent Claim
91 words
A process for imparting barrier properties to a polymeric substrate, comprising the steps of: (a) selecting a polymeric substrate; and (b) vacuum depositing directly or indirectly onto said polymeric substrate a glassy coating derived from silicon dioxide and at least one metal selected from the group consisting of antimony, aluminum, chromium, cobalt, copper, indium, iron, lead, manganese, tin, titanium, tungsten, zinc, and zirconium; wherein the amount of said glassy coating and the amount of metal contained therein is suitable to provide an oxygen transmission value of at most about 5 mL/day-m²-atm.
Claim 15
Dependent Claim
45 words
A multilayer structure comprising a polymeric substrate of polyester or polyamide, a vacuum deposited layer of SiO of about 10 to 75 nm thickness on said substrate, and a vacuum deposited layer of SiO₂ of at least about 20 nm thickness on said SiO layer.
Claim 16
Dependent Claim
26 words
The multilayer structure of Claim 15 wherein said SiO layer has an atomic ratio of oxygen to silicon in said layer of from 0.6:1 to 1.4:1.
Claim 17
Dependent Claim
29 words
The multilayer structure of Claim 15 or 16 wherein said SiO₂ layer contains an effective amount of dopant to improve its barrier properties upon retorting of said multilayer structure.
Claim 18
Dependent Claim
61 words
The multilayer structure of Claim 17 wherein said dopant is a metallic material selected from the group consisting of Ti, Zr, Zn, Al, In, Pb, W, Cu, Sn, Cr, Fe, Mn, Sb, Co, Ba, and Mg, and mixtures thereof, and the amount thereof present in said SiO₂ layer is about 0.5 to 30% based on the total weight of the layer.
Claim 19
Dependent Claim
25 words
The multilayer structure of any one of Claims 15 to 18 having an oxygen transmission rate (OTR) of less than about 7 cc/m² Day Atm.
Claim 20
Dependent Claim
18 words
The multilayer structure of Claim 19 wherein said oxygen transmission rate is present both before and after retorting.
Claim 21
Dependent Claim
17 words
The multilayer structure of any one of Claims 15 to 20 in the form of a film.
Claim 22
Dependent Claim
17 words
The multilayer structure of any one of Claims 15 to 20 in the form of a container.
Claim 23
Dependent Claim
69 words
A process for forming a barrier structure from a resin substrate of polyester or polyamide polymer comprising vacuum depositing a layer of SiO of about 10 to 75 nm thickness on said container and vacuum depositing a layer of SiO₂ of at least about 20 nm thickness on said SiO layer, the resultant multilayer structure having an oxygen transmission rate (OTR) of less than about 7 cc/m² Day Atm.
Claim 24
Dependent Claim
44 words
The process of Claim 23 wherein metal dopant is vacuum deposited along with the vacuum deposition of said layer of SiO₂ so that said metal dopant is incorporated in said SiO₂ layer in effective amount to provide said OTR after retorting of said structure.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.