EP0722787A2
Expired / Lapsed
EP
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Process for making an acrylate coating
Assignee: 3M Innovative Properties Co
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Filing: 1994-10-04
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Granted: —
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Expires: 2014-10-04
Abstract
Abstract Sheet material is given low oxygen permeability or prepared for winding high voltage capacitors by evaporating polyfunctional acrylate monomer having a molecular rate in the range of from 150 to 600 and condensing the acrylate as a monomer film on a dielectric or thermoplastic substrate. The acrylate is polymerized by irradiation by ultraviolet or electrons. A metallized layer provides an electrode of a capacitor. Electrical contact can be made to the metal layer by Schooping even though the metallized layer is covered by a layer of acrylate. A material selected from the group consisting of silicon oxide, silicon nitride, aluminum nitride, titanium nitride, aluminum oxide and metal may be deposited for forming an oxygen barrier. Adhesion is enhanced by plasma treatment of a surface immediately before deposition. Condensation efficiency is also enhanced by chilling the substrate on which the acrylate is condensed.
Inventors
- 👤 David G. Shaw
- 👤 Eric Dawson
- 👤 Daniel Cline
- 👤 Marc Langlois
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 16:29
CPC Classifications
B; B05; B05D; B05D1/00; B05D1/60; H; H01; H01G; H01G4/00; H01G4/002; H01G4/018; H01G4/06; H01G4/14; H01G4/18; B05D3/00; B05D3/14; B05D3/141; B05D3/142; B05D3/144; B65; B65D; B65D1/00; B65D1/02; B65D1/0207; B65D1/0215; C; C08; C08J; C08J7/00; C08J7/04; H01G2/00; H01G2/12; H01G4/20; H01G4/206; H01G4/32; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1334; Y10T428/1338; Y10T428/1352; Y10T428/1355; Y10T428/1359; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/24967; Y10T428/24975; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265; Y10T428/31504; Y10T428/31652; Y10T428/31667; Y10T428/31678; Y10T428/31692; Y10T428/31699; Y10T428/31725; Y10T428/31739; Y10T428/31743; Y10T428/3175; Y10T428/31786; Y10T428/31797; Y10T428/31855; Y10T428/31909; Y10T428/31928; Y10T428/31935
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
92 words
A method for forming a substrate coated with an acrylate layer comprising the steps of: chilling a substrate to a temperature below ambient temperature outside of a deposition station; passing the chilled substrate through a deposition station while the substrate is still at a temperature below ambient temperature; at the deposition station: evaporating an acrylate monomer having an average molecular weight in the range of from 150 to 600, and condensing the acrylate monomer on the substrate as a acrylate film; and polymerizing the acrylate film for forming a polymerized acrylate layer.
Claim 2
Dependent Claim
42 words
A method according to claim 1 wherein the substrate comprises a flexible sheet and comprising the steps of: engaging a face of the flexible sheet with a chilled roller; and depositing the acrylate on the same face that engaged the chilled roller.
Claim 3
Independent Claim
49 words
A method according to either one of claims 1 or 2 wherein the substrate comprises a plastic film and comprising the steps of: chilling a roll of plastic film, unrolling the plastic film, engaging the plastic film with a chilled drum, and rotating the drum past the deposition station.
Claim 4
Independent Claim
62 words
A method according to either one of claims 1 or 2 wherein the substrate comprises a flexible sheet film and comprising the steps of: engaging a first face of the sheet with a chilled roller; thereafter engaging the other face of the sheet with a chilled drum; and rotating the drum past the deposition station for depositing acrylate on the first face.
Claim 5
Independent Claim
68 words
A method for forming a flexible sheet substrate coated with an acrylate layer comprising the steps of: engaging a face of the flexible sheet with a chilled roller; evaporating an acrylate monomer in a vacuum system; condensing the acrylate as an acrylate film on the same face of the substrate that was engaged by the chilled roller; and polymerizing the acrylate film for forming a polymerized acrylate layer.
Claim 6
Independent Claim
81 words
A method for forming a substrate coated with an acrylate layer comprising the steps of: preheating a polyfunctional acrylate prepolymer to a temperature above ambient temperature and lower than a temperature where the prepolymer polymerizes; atomizing the preheated prepolymer into a heated vaporization chamber in a vacuum system; vaporizing the prepolymer in the vaporization chamber and discharging the vaporised prepolymer into the vacuum system; depositing the prepolymer on a substrate; and polymerizing the acrylate prepolymer for forming a crosslinked acrylate layer.
Claim 7
Independent Claim
47 words
A method according to any one of the preceding claims wherein the acrylate is a blend of acrylate monomers comprising at least one monomer having a molecular weight in the range of from 150 to 400 and an acrylate having a molecular weight of more than 600.
Claim 8
Dependent Claim
58 words
A wound capacitor comprising: at least one thermoplastic dielectric sheet wound into a cylinder; a metallized conductive layer deposited on at least one face of the dielectric sheet; a layer of crosslinked acrylate in direct contact with the entire metallized layer; and an electrical contact made to the conductive layer at an end of the cylinder by Schooping.
Claim 9
Dependent Claim
15 words
A capacitor according to claim 7 wherein the acrylate layer overlies the entire metallized layer.
Claim 10
Dependent Claim
36 words
A capacitor according to either one of claims 7 or 8 wherein the first layer of crosslinked acrylate underlies the conductive layer and further comprising a second layer of crosslinked acrylate deposited over the conductive layer.
References Cited (Backward Citations)
No citation records indexed.
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