US3632386A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treated silicone surface
Assignee: ARBCO Inc
•
Filing: 1969-04-28
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Granted: 1972-01-04
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Expires: 1989-04-28
Abstract
Abstract A silicone polymer release surface is corona treated to decrease its release properties. The corona treatment results in change of the molecular structure of the silicone polymer at the surface and the surface can then be coated with a pressure sensitive adhesive before the silicone molecules are permitted to completely realign to their original structure. The adhesive blocks realignment and can be applied immediately after corona treatment by in line processing or after the lapse of a sufficient period of time to permit the molecules to realign to the extent providing the particular desired release properties. Alternatively, the corona treatment can be controlled to give the desired release properties and the adhesive can be immediately applied.
Inventors
- 👤 Alan R Hurst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:53
CPC Classifications
D; D21; D21H; D21H19/00; D21H19/80; D21H19/84; D21H19/82; C; C09; C09J; C09J2483/00; C09J2483/005; D21H19/10; D21H19/14; D21H19/20; D21H19/22; D21H19/24; D21H19/32; D21H25/00; D21H25/04; D21H25/06; D21H27/00; D21H27/001; D21H27/14; D21H27/30; D21H27/32; D21H27/34; D21H27/36; D21H27/38; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10T; Y10T428/00; Y10T428/14; Y10T428/1452; Y10T428/28; Y10T428/2809; Y10T428/2839; Y10T428/31504; Y10T428/31652; Y10T428/31663; Y10T428/31667; Y10T428/31855; Y10T428/3188; Y10T428/31895; Y10T428/31909; Y10T428/31913; Y10T428/31971; Y10T428/31993
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
40 words
The method of producing a pressure-sensitive adhesive on a release backing which comprises the method of claim 1 wherein the protecting step comprises applying a pressure-sensitive adhesive to the treated surface to hold the silicone polymer molecules against substantial realignment.
Claim 2
Dependent Claim
28 words
The method of claim 2 wherein the applying step immediately follows the treating step before the treated surface is permitted to return appreciably toward its original molecular structure.
Claim 3
Dependent Claim
25 words
The method of claim 3 wherein the release surface is the surface of a moving web and the applying step follows the subjecting step inline.
Claim 4
Dependent Claim
29 words
The method of claim 1 in which the release surface is the surface of a flexible laminate web of plastic film on both sides of a sheet of paper.
Claim 5
Dependent Claim
31 words
The method of claim 5 in which both surfaces of the web have silicone polymer release coatings forming release surfaces and in which both surfaces are subjected to the oxidative treatment.
Claim 6
Dependent Claim
15 words
The method of claim 1 wherein said silicone polymer is a cured silicone rubber polymer.
Claim 7
Independent Claim
79 words
A method of reducing the release characteristics of a silicone polymer release surface which method comprises subjecting the surface to oxidation treatment selected from the class consisting of electrical discharge treatment and flame treatment until the release properties are reduced, permitting the treated surface to return partially to its original molecular state to provide a preselected release value and then applying a pressure sensitive adhesive to the treated surface to hold the silicone polymer molecules against substantial further realignment.
Claim 8
Independent Claim
72 words
A method of reducing the release characteristics of a silicone polymer release surface on a release sheet to a predetermined desired level which method comprises: subjecting the surface to flame treatment until the release properties are reduced and then protecting the treated surface against loss of reduced release properties before realignment of the surface molecular structure to its original condition and at a time when the release properties are at said level.
Claim 9
Independent Claim
72 words
A method of reducing the release characteristics of a silicone polymer release surface on a release sheet to a predetermined desired level which method comprises: subjecting the surface to corona treatment until the release properties are reduced and then protecting the treated surface against loss of reduced release properties before realignment of the surface molecular structure to its original condition and at a time when the release properties are at said level.
Claim 10
Dependent Claim
26 words
The method of claim 10 wherein the electrical discharge is corona discharge establishing a field of between 10 and 1,000 volts across the surface being treated.
Claim 11
Dependent Claim
92 words
The method of claim 11 wherein the surface is the surface of a web traveling through a corona discharge station and then through an inline pressure-sensitive adhesive application station and including the steps of varying the web speed or discharge voltage to control the electrical discharge per square foot received by the surface and thereby control the amount of reduction in release properties to the desired level for receiving the adhesive at the application station to adhere at a preselected increased bond strength compared with adherence to an untreated silicone polymer surface.
Claim 12
Dependent Claim
39 words
As an article of manufacture a release sheet with a polyolefin layer having a corona-treated silicone polymer surface on said layer and a protective coating on said surface and holding the silicone polymer of said surface against molecular realignment.
Claim 13
Dependent Claim
12 words
The article of claim 13 wherein said coating is a pressure-sensitive adhesive.
Claim 14
Dependent Claim
26 words
The article of claim 14 wherein the silicone polymer surface comprises a silicone polymer coating on a substrate and wherein the substrate is polyolefin coated paper.
Claim 15
Dependent Claim
15 words
The article of claim 15 wherein the paper is coated with plastic on both sides.
Claim 16
Dependent Claim
11 words
The article of claim 16 wherein both plastic coatings are polyethylene.
Claim 17
Dependent Claim
11 words
The article of claim 13 wherein said polyolefin is polyethylene .
Claim 18
Dependent Claim
39 words
As an article of manufacture a release sheet with a polyolefin layer having a flame-treated silicone polymer surface on said layer and a protective coating on said surface and holding the silicone polymer of said surface against molecular realignment.
References Cited (Backward Citations)
GB751991A
Cited
US3403045A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-03 | 1975-07-05 | 1976-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-03 | 1979-07-05 | 1980-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-03 | 1983-07-05 | 1984-01-04 | $7700.00 | Window Closed / Lapsed |